FILLING METHOD FOR MIXED REFRIGERANT INCLUDING TRIFLUOROETHYLENE

Abstract

The present invention relates to a filling method for a mixed refrigerant, in which in a case of transferring and filling a mixed refrigerant that contains trifluoroethylene and 2,3,3,3-tetrafluoropropene and in which the trifluoroethylene is present in an amount of 10 to 92 mass % in a liquid phase, with respect to a total 100 mass % of the trifluoroethylene and the 2,3,3,3-tetrafluoropropene, in a liquid from a feeding container to a target container and equipment, a liquid phase mixing ratio (initial composition) of the trifluoroethylene in the mixed refrigerant in the feeding container immediately before the transferring and filling is set to x+y.sub.P (minimum value) to x % (target upper limit composition).

Claims

1. A filling method for a mixed refrigerant, in which in a case of transferring and filling a mixed refrigerant that contains trifluoroethylene and 2,3,3,3-tetrafluoropropene and in which the trifluoroethylene is present in an amount of 10 to 92 mass % in a liquid phase, with respect to a total 100 mass % of the trifluoroethylene and the 2,3,3,3-tetrafluoropropene, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of the trifluoroethylene in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of the trifluoroethylene to the target upper limit composition (x)4.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of the trifluoroethylene in the mixed refrigerant in the feeding container immediately before the transferring and filling is set to x+y.sub.P (minimum value) to x % (target upper limit composition); a: initial filling amount (mass %) in feeding container; x: target upper limit composition (10x92, except for a range where y.sub.P>0); y.sub.P: lower limit value of gap from target upper limit composition in initial composition, which is a value represented by expression (A):
1000y.sub.P=L.sub.Px.sup.3+M.sub.Px.sup.2+N.sub.Px+P.sub.P
L.sub.P=0.00003a+0.0211
M.sub.P=0.0119a5.313
N.sub.P=0.9678a+334.84
P.sub.P=2.979a4879.3(A)

2. A filling method for a mixed refrigerant, in which in a case of transferring and filling a mixed refrigerant that contains trifluoroethylene and 2,3,3,3-tetrafluoropropene and in which the trifluoroethylene is present in an amount of 10 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of the trifluoroethylene and the 2,3,3,3-tetrafluoropropene, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of the trifluoroethylene in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of the trifluoroethylene to the target upper limit composition (x)3.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of the trifluoroethylene in the mixed refrigerant in the feeding container immediately before the transferring and filling is set to x+y.sub.Q (minimum value) to x % (target upper limit composition); a: initial filling amount (mass %) in feeding container; x: target upper limit composition (10x91.5, except for a range where y.sub.Q>0); y.sub.Q: lower limit value of gap from target upper limit composition in initial composition, which is a value represented by expression (B):
1000y.sub.Q=L.sub.Qx.sup.3+M.sub.Qx.sup.2+N.sub.Qx+P.sub.Q
L.sub.Q=0.0001a0.0276
M.sub.Q=0.0262a6.2574
N.sub.Q=1.5203a+364.04
P.sub.Q=5.928a3797.8(B)

3. A filling method for a mixed refrigerant, in which in a case of transferring and filling a mixed refrigerant that contains trifluoroethylene and 2,3,3,3-tetrafluoropropene and in which the trifluoroethylene is present in an amount of 10 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of the trifluoroethylene and the 2,3,3,3-tetrafluoropropene, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of the trifluoroethylene in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of the trifluoroethylene to the target upper limit composition (x)2.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of the trifluoroethylene in the mixed refrigerant in the feeding container immediately before the transferring and filling is set to x+y.sub.R (minimum value) to x % (target upper limit composition); a: initial filling amount (mass %) in feeding container; x: target upper limit composition (10x91, except for a range where y.sub.R>0); y.sub.R: lower limit value of gap from target upper limit composition in initial composition, which is a value represented by expression (C):
1000y.sub.R=L.sub.Rx.sup.3+M.sub.Rx.sup.2+N.sub.Rx+P.sub.R
L.sub.R=0.00005a+0.0223
M.sub.R=0.0159a5.5003
N.sub.R=1.0799a+324.91
P.sub.R=2.771a2333.7(C)

Description

DESCRIPTION OF EMBODIMENTS

[0036] Hereinafter, embodiments for carrying out the present invention will be described.

[0037] In order to solve a problem of compositional changes occurring in a case of transferring and filling a non-azeotropic mixture composed of two types of liquefied gases having different boiling points stored in a closed container from a liquid side to another container, the present inventors have made extensive studies on a filling method for liquefied gas.

[0038] That is, the present invention provides a filling method for a non-azeotropic mixed refrigerant composed of HFO-1123 and HFO-1234yf as described below.

[0039] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant, which is a non-azeotropic refrigerant and has a composition with HFO-1123 being 10 to 92 mass % in a liquid phase, from a feeding container to a target container and equipment, a liquid phase mixing ratio of HFO-1123 in the feeding container before the transferring and filling is set within a specific range.

[0040] Descriptions will be made with respect to a mixing ratio of the mixed refrigerant in the feeding container before carrying out transferring and filling, in a case of transferring and filling the mixed refrigerant from the feeding container to the target container and equipment such that maximum filling (filling amount of 100 mass %) of the mixed refrigerant into the container is achieved.

[0041] The above-mentioned filling amount of 100 mass % refers to a maximum filling amount that can be filled in a container and is defined by the International Law on Transportation and the Japan's High Pressure Gas Safety Act. According to the Japan's High Pressure Gas Safety Act, it is calculated as follows. [0042] SG=V/C [0043] G: Mass of fluorocarbon (kg) [0044] V: Internal volume of container (L) [0045] C: Constant depending on type of fluorocarbon

[0046] In this case, a filling constant C is defined in Japan as a value obtained by dividing 1.05 by a specific gravity of gas in question at 48 C. In addition, in a case involving exports, according to the International Law, this filling constant C is defined as a value obtained by dividing 1.05 by a specific gravity of gas in question at 65 C. in a case of passing through tropical regions, and is defined as a value obtained by dividing 1.05 by a specific gravity of gas in question at 45 C. for other regions except the tropics.

[0047] In a case of transferring and filling the HFO-1123/HFO-1234yf mixed refrigerant from the feeding container to the target container and equipment, as an initial filling amount of the feeding container is smaller, compositional changes of a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof become smaller.

[0048] Hereinafter, a value obtained by dividing 1.05 by a specific gravity of gas in question at 45 C. is adopted as a filling constant, and the calculated value is set to a filling amount of 100%.

[0049] Hereinafter, embodiments of a specific filling method will be described according to mass % difference between a target upper limit composition and a target lower limit composition.

(1) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 4 Mass %

[0050] In a case of transferring and filling a mixed refrigerant in a liquid from a feeding container to a target container and equipment, a mixing ratio of the mixed refrigerant in the feeding container before the transferring and filling will be described so as to keep the liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)4.0 mass % (target lower limit composition).

[0051] The above-mentioned target upper limit composition: (x) is a maximum value that allows composition of HFO-1123 in the entire composition (liquid phase+gas phase) of the HFO-1123/HFO-1234yf mixed refrigerant, which is required in the target container and equipment, to be within the range. x (mass %) is a numerical value within a range of 10x92. The above-mentioned target lower limit composition: (x)4 mass % is a minimum value that allows composition of HFO-1123 in the entire composition (liquid phase+gas phase) of the HFO-1123/HFO-1234yf mixed refrigerant, which is required in the target container and equipment, to be within the range.

(1-1) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 4 Mass %

[0052] In the filling method for a mixed refrigerant of the present invention in a case where a filling amount of the mixed refrigerant to a container is appropriately adjusted, in a case of transferring and filling a mixed refrigerant that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 92 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)4.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before carrying out the transferring and filling is set to x+y.sub.P (minimum value) to x % (target upper limit composition).

[0053] a: Initial filling amount (mass %) in feeding container

[0054] x: Target upper limit composition (mass %, 10x92, except for a range where y.sub.P>0).

[0055] y.sub.P: Lower limit value of a gap between target upper limit composition and initial composition, which is a value represented by Expression (1).

[Math. 4]

1000y.sub.P=L.sub.Px.sup.3+M.sub.Px.sup.2+N.sub.Px+P.sub.P

L.sub.P=0.0000a+0.0211

M.sub.P=0.0119a5.313

N.sub.P=0.9678a+334.84

P.sub.P2.979a4879.3(1)

[0056] According to the filling method for a mixed refrigerant of the present invention, even in a case where a filling amount of the mixed refrigerant in the feeding container is 100 mass % of a maximum filling amount, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out transferring and filling to a specific range, it is possible to keep compositional changes in a target container and equipment with a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0057] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling.

[0058] Further, the value of a is usually set within a range of 60a100.

[0059] Hereinafter, as an example of the transferring and filling method, a case where a handling temperature during transferring and filling is 40 C. is shown. For example, in the Japan's High Pressure Gas Safety Act, since handling of containers at 40 C. or higher is prohibited, a handling temperature during transferring and filling in Japan is 0 C. to 40 C. As a temperature during transferring and filling (during handling) is higher, compositional changes due to the transferring and filling from start of the transferring and filling until completion thereof become larger in a case of carrying out the transferring and filling in a liquid from the feeding container to the target container and equipment. Therefore, conditions of transferring and filling at a handling temperature of 40 C. are applied, and thus such conditions are also applicable to a handling temperature of 0 C. to 40 C.

[0060] Further, regarding also a filling amount in the feeding container, as an initial filling amount is smaller, a range of compositional changes due to the transferring and filling from start of the transferring and filling until completion thereof become smaller in a case of carrying out transferring and filling in a liquid from the feeding container to the target container and equipment. Therefore, a mathematical expression satisfying a filling method in which an initial filling amount is a mass % also satisfies a filling method in which the initial filling amount is a mass % or less. For example, a mathematical expression satisfying a filling method in which an initial filling amount is 100 mass % also satisfies a filling method in which the initial filling amount is 100 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 90 mass % also satisfies a filling method in which the initial filling amount is 90 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 80 mass % also satisfies a filling method in which the initial filling amount is 80 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 70 mass % also satisfies a filling method in which the initial filling amount is 70 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 60 mass % also satisfies a filling method in which the initial filling amount is 60 to 0 mass %.

[0061] Liquid Phase Mixing Ratio of HFO-1123 in Mixed Refrigerant in Feeding Container

[0062] In the present invention, in order to be kept within a range from the target upper limit composition (x) of HFO-11234.0 mass % (target lower limit composition) to the target upper limit composition (x), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before transferring and filling is set to x+y.sub.P (minimum value) to x % (target upper limit composition).

[0063] x is a target upper limit composition, and y.sub.P is a gap between the target upper limit composition (x) and the initial composition. x+y.sub.1 represents a minimum value of the liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container.

[0064] A difference between the target upper limit composition and the target lower limit composition is called a composition tolerance. The composition tolerance is determined in a case where a composition of a mixed refrigerant is registered in ASHRAE Standard 2013 (Designation and Safety Classification of Refrigerants) or the like.

[0065] In a mixed refrigerant containing HFO-1123 and HFO-1234yf, a case where a mixing ratio of HFO-1123 and HFO-1234yf is, for example, 50:50 (mass %) will be described. In this mixed refrigerant (HFO-1123/HFO-1234yf), in a case where a composition tolerance is set to +2.0, 2.0/+2.0, 2.0, a target upper limit composition of HFO-1123 is 52.0 mass %, and a target lower limit composition of HFO-1123 is 48.0 mass %. Thus, the mixed refrigerant has a difference of 4 mass % between the target upper limit composition and the target lower limit composition.

(1-2) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 100 Mass % of Maximum Filling Amount

[0066] A case where a filling amount of a mixed refrigerant to a container is 100 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0067] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 92 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 100 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)4.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.P1 (minimum value) to x % (target upper limit composition).

[0068] The above-mentioned x is a target upper limit composition (where x satisfies 10x92).

[0069] y.sub.P1 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (2).

[Math. 5]

1000y.sub.P1=0.0189x.sup.34.2359x.sup.2+245.39x4637.1(2)

[0070] In the present invention, from Expression (2), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x3.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0071] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0072] Further, in a case where HFO-1123 is contained in an amount of 92 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 3.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(1-3) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 90 Mass % of Maximum Filling Amount

[0073] A case where a filling amount of a mixed refrigerant to a container is 90 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0074] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 92 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 90 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)4.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.P2 to x mass % (target upper limit composition).

[0075] The above-mentioned x is a target upper limit composition (where x satisfies 10x92).

[0076] y.sub.P2 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (3).

[Math. 6]

1000y.sub.P2=0.0184x.sup.34.1549x.sup.2242.21x4555.6(3)

[0077] In the present invention, from Expression (3), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x3.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0078] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0079] Further, in a case where HFO-1123 is contained in an amount of 92 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 3.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(1-4) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 80 Mass % of Maximum Filling Amount

[0080] A case where a filling amount of a mixed refrigerant to a container is 80 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0081] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 92 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 80 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)4.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.P3 to x mass %.

[0082] The above-mentioned x is a target upper limit composition (where x satisfies 10x92).

[0083] y.sub.P3 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (4).

[Math. 7]

1000y.sub.P3=085x.sup.34.2481x.sup.2+250.46x457.7(4)

[0084] In the present invention, from Expression (4), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x3.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0085] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0086] Further, in a case where HFO-1123 is contained in an amount of 92 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 3.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(1-5) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 70 Mass % of Maximum Filling Amount

[0087] A case where a filling amount of a mixed refrigerant to a container is 70 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0088] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 92 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 70 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)4.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.P4 to x mass %.

[0089] The above-mentioned x is a target upper limit composition (where x satisfies 10x92).

[0090] y.sub.P4 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (5).

1000y.sub.P4=0.0196x.sup.34.5196x.sup.2+268.29x4736.9(5)[Math. 8]

[0091] In the present invention, from Expression (5), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x3.1 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0092] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0093] Further, in a case where HFO-1123 is contained in an amount of 92 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 3.1 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(1-6) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 60 Mass % of Maximum Filling Amount

[0094] A case where a filling amount of a mixed refrigerant to a container is 60 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0095] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 28.7 mass % or 54.0 to 92 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 60 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)4.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.P5 to x mass %.

[0096] The above-mentioned x is a target upper limit composition (where x satisfies 10x28.7 or 54.0x92).

[0097] y.sub.P5 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (6).

[Math. 9]

1000y.sub.P8=0.196x.sup.34.6483x.sup.2+280.74x4695.4(6)

[0098] In the present invention, from Expression (6), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x3.0 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0099] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0100] Further, in a case where HFO-1123 is contained in an amount of 92 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 3.0 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)4.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(1-7) Filling Method for Non-Azeotropic Mixed Refrigerant Containing HFO-1123 and HFO-1234yf

[0101] A filling method that allows a non-azeotropic mixed refrigerant composed of HFO-1123 and HFO-1234yf to be kept within a range from the target upper limit composition (x) of HFO-11234.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0102] Expression (1) can be derived from Expressions (2) to (6). Based on values of coefficients of Expressions (2) to (6), Lp to Pp of Expression (1) can be derived from the target upper limit composition (x) with respect to the initial filling amount (a mass %).

[0103] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 92 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from the target upper limit composition (x) of HFO-11234.0 mass % (target lower limit composition) to a target upper limit composition (x), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is set to x+y.sub.P(minimum value) to x (maximum value) mass %.

[0104] a: Initial filling amount (mass %) in feeding container

[0105] x: Target upper limit composition (mass %, 10x92, except for a range where y.sub.P>0).

[0106] y.sub.P: Lower limit value of a gap between target upper limit composition and initial composition, which is a value represented by Expression (1).

[Math. 10]

1000y.sub.P=L.sub.Px.sup.3+M.sub.Px.sup.2+N.sub.Px+P.sub.P

L.sub.P=0.00003a+0.0211

M.sub.P=0.0119a5.313

N.sub.P=0.9678a334.84

P.sub.P=2.979a4879.3(1)

(2) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 3 Mass %

[0107] In a case of transferring and filling a mixed refrigerant in a liquid from a feeding container to a target container and equipment, a mixing ratio of the mixed refrigerant in the feeding container before the transferring and filling will be described so as to keep the liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)3.0 mass % (target lower limit composition).

[0108] The above-mentioned target upper limit composition: (x) is a maximum value that allows composition of HFO-1123 in the entire composition (liquid phase+gas phase) of the HFO-1123/HFO-1234yf mixed refrigerant, which is required in the target container and equipment, to be within the range. x (mass %) is a numerical value within a range of 10x91.5. The above-mentioned target lower limit composition: (x)3 mass % is a minimum value that allows composition of HFO-1123 in the entire composition (liquid phase+gas phase) of the HFO-1123/HFO-1234yf mixed refrigerant, which is required in the target container and equipment, to be within the range.

(2-1) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 3 Mass %

[0109] In the filling method for a mixed refrigerant of the present invention in a case where a filling amount of the mixed refrigerant to a container is appropriately adjusted, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)3.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before carrying out the transferring and filling is set to x+y.sub.Q (minimum value) to x mass % (maximum value).

[0110] a: Initial filling amount (mass %) in feeding container

[0111] x: Target upper limit composition (mass %, 10x91.5, except for a range where y.sub.Q>0).

[0112] y.sub.Q: Lower limit value of a gap between target upper limit composition and initial composition, which is a value represented by Expression (7).

[Math. 11]

1000y.sub.Q=L.sub.Qx.sup.3+M.sub.Qx.sup.2+N.sub.Qx+P.sub.Q

L.sub.Q=0.0001a+0.0276

M.sub.Q=0.0262a6.2574

N.sub.Q=1.5203a+364.04

P.sub.Q=5.928a3797.8(7)

[0113] According to the filling method for a mixed refrigerant of the present invention, even in a case where a filling amount of the mixed refrigerant in the feeding container is 100 mass % of a maximum filling amount, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out transferring and filling to a specific range, it is possible to keep compositional changes in a target container and equipment with a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0114] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling.

[0115] Further, the value of a is usually set within a range of 60a100.

[0116] Hereinafter, as an example of the transferring and filling method, a case where a handling temperature during transferring and filling is 40 C. is shown. For example, in the Japan's High Pressure Gas Safety Act, since handling of containers at 40 C. or higher is prohibited, a handling temperature during transferring and filling in Japan is, in particular, 0 C. to 40 C. As a temperature during transferring and filling (during handling) is higher, compositional changes due to the transferring and filling from start of the transferring and filling until completion thereof become larger in a case of carrying out the transferring and filling in a liquid from the feeding container to the target container and equipment. Therefore, conditions of transferring and filling at a handling temperature of 40 C. are applied, and thus such conditions are also applicable to a handling temperature of 0 C. to 40 C.

[0117] Further, regarding also a filling amount in the feeding container, as an initial filling amount is smaller, a range of compositional changes due to the transferring and filling from start of the transferring and filling until completion thereof become smaller in a case of carrying out transferring and filling in a liquid from the feeding container to the target container and equipment. Therefore, a mathematical expression satisfying a filling method in which an initial filling amount is a mass % also satisfies a filling method in which the initial filling amount is a mass % or less. For example, a mathematical expression satisfying a filling method in which an initial filling amount is 100 mass % also satisfies a filling method in which the initial filling amount is 100 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 90 mass % also satisfies a filling method in which the initial filling amount is 90 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 80 mass % also satisfies a filling method in which the initial filling amount is 80 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 70 mass % also satisfies a filling method in which the initial filling amount is 70 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 60 mass % also satisfies a filling method in which the initial filling amount is 60 to 0 mass %.

[0118] Liquid Phase Mixing Ratio of HFO-1123 in Mixed Refrigerant in Feeding Container

[0119] In the present invention, in order to be kept within a range from the target upper limit composition (x) of HFO-1123-3.0 mass % (target lower limit composition) to the target upper limit composition (x), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before transferring and filling is set to x+y.sub.Q (minimum value) to x % (target upper limit composition).

[0120] x is a target upper limit composition, and y.sub.Q is a gap between the target upper limit composition (x) and the initial composition. x+y.sub.Q represents a minimum value of the liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container.

[0121] A difference between the target upper limit composition and the target lower limit composition is called a composition tolerance. The composition tolerance is determined in a case where a composition of a mixed refrigerant is registered in ASHRAE Standard 2013.

[0122] In a mixed refrigerant containing HFO-1123 and HFO-1234yf, a case where a mixing ratio of HFO-1123 and HFO-1234yf is, for example, 50:50 (mass %) will be described. In this mixed refrigerant (HFO-1123/HFO-1234yf), in a case where a composition tolerance is set to +1.5, 1.5/+1.5, 1.5, a target upper limit composition of HFO-1123 is 51.5 mass %, and a target lower limit composition of HFO-1123 is 48.5 mass %. Thus, the mixed refrigerant has a difference of 3 mass % between the target upper limit composition and the target lower limit composition.

(2-2) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 100 Mass % of Maximum Filling Amount

[0123] A case where a filling amount of a mixed refrigerant to a container is 100 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0124] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 22.9 mass % or 57.3 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 100 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)3.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.Q1 to x mass %.

[0125] The above-mentioned x is a target upper limit composition (where x satisfies 10x22.9 or 57.3x91.5).

[0126] y.sub.Q1 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (8).

[Math. 12]

1000y.sub.Q1=0.0165x.sup.33.7774x.sup.2+218.61x3229(8)

[0127] In the present invention, from Expression (8), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x2.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0128] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0129] Further, in a case where HFO-1123 is contained in an amount of 91.5 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 2.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(2-3) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 90 Mass % of Maximum Filling Amount

[0130] A case where a filling amount of a mixed refrigerant to a container is 90 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0131] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 22.2 mass % or 59.4 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 90 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)3.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.Q2 to x mass %.

[0132] The above-mentioned x is a target upper limit composition (where x satisfies 10x22.2 or 59.4x91.5).

[0133] y.sub.Q2 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (9).

[Math. 13]

1.000y.sub.Q2=0.016x.sup.33.7675x.sup.2+222.04x3250.8(9)

[0134] In the present invention, from Expression (9), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x2.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0135] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0136] Further, in a case where HFO-1123 is contained in an amount of 91.5 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 2.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(2-4) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 80 Mass % of Maximum Filling Amount

[0137] A case where a filling amount of a mixed refrigerant to a container is 80 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0138] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 22.2 mass % or 59.4 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 80 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)3.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.Q3 to x mass %.

[0139] The above-mentioned x is a target upper limit composition (where x satisfies 10x22.2 or 59.4x91.5).

[0140] y.sub.Q3 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (10).

[Math. 14]

1000y.sub.Q3=0.0179x.sup.34.091x.sup.2+236.8x3274.6 (10)

[0141] In the present invention, from Expression (10), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x2.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0142] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0143] Further, in a case where HFO-1123 is contained in an amount of 91.5 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 2.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(2-5) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 70 Mass % of Maximum Filling Amount

[0144] A case where a filling amount of a mixed refrigerant to a container is 70 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0145] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 20.3 mass % or 61.2 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 70 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)3.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.Q4 to x mass %.

[0146] The above-mentioned x is a target upper limit composition (where x satisfies 10x20.3 or 61.2x91.5).

[0147] y.sub.Q4 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (11).

[Math. 15]

1000y.sub.Q4=0.095x.sup.34.4436x.sup.2+257.93x3425.4(11)

[0148] In the present invention, from Expression (11), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x2.1 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0149] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0150] Further, in a case where HFO-1123 is contained in an amount of 91.5 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 2.1 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(2-6) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 60 Mass % of Maximum Filling Amount

[0151] A case where a filling amount of a mixed refrigerant to a container is 60 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0152] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 17.0 mass % or 67.3 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 60 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)3.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.Q5 to x mass %.

[0153] The above-mentioned x is a target upper limit composition (where x satisfies 10x17.0 or 67.3x91.5).

[0154] y.sub.Q5 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (12).

[Math. 16]

1000y.sub.Q5=0.0207x.sup.34.7469x.sup.2+276.68x3438.1(12)

[0155] In the present invention, from Expression (12), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x2.0 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0156] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0157] Further, in a case where HFO-1123 is contained in an amount of 91.5 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 2.0 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)3.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(2-7) Filling Method for Non-Azeotropic Mixed Refrigerant Containing HFO-1123 and HFO-1234yf

[0158] A filling method that allows a non-azeotropic mixed refrigerant composed of HFO-1123 and HFO-1234yf to be kept within a range from the target upper limit composition (x) of HFO-1123-3.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0159] Expression (7) can be derived from Expressions (8) to (12). Based on values of coefficients of Expressions (8) to (12), L.sub.Q to P.sub.Q of Expression (7) can be derived from the target upper limit composition (x) with respect to the initial filling amount (a mass %).

[0160] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 91.5 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from the target upper limit composition (x) of HFO-1123-3.0 mass % (target lower limit composition) to a target upper limit composition (x), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is set to x+y.sub.Q (minimum value) to x (maximum value) mass %.

[0161] a: Initial filling amount (mass %) in feeding container

[0162] x: Target upper limit composition (mass %, 10x91.5, except for a range where y.sub.Q>0).

[0163] y.sub.Q: Lower limit value of a gap between target upper limit composition and initial composition, which is a value represented by Expression (7).

[Math. 17]

1000y.sub.Q=L.sub.Qx.sup.3+M.sub.Qx.sup.2+N.sub.Qx+P.sub.Q

L.sub.Q=0.0001a+0.0276

M.sub.Q=0.0262a6.2574

N.sub.Q=1.5203a+364.04

P.sub.Q=5.928a3797.8(7)

(3) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 2 Mass %

[0164] In a case of transferring and filling a mixed refrigerant in a liquid from a feeding container to a target container and equipment, a mixing ratio of the mixed refrigerant in the feeding container before the transferring and filling will be described so as to keep the liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)2.0 mass % (target lower limit composition).

[0165] The above-mentioned target upper limit composition: (x) means that the composition of HFO-1123 in the entire composition (liquid phase+gas phase) of the HFO-1123/HFO-1234yf mixed refrigerant required in the target container and equipment is a maximum value that allows the composition to be within this range. x (mass %) is a numerical value within the range of 10x91. The target lower limit composition: (x)2 mass % means that the composition of HFO-1123 in the entire composition (liquid phase+gas phase) of the HFO-1123/HFO-1234yf mixed refrigerant required in the target container and equipment is a minimum value that allows the composition to be within this range.

(3-1) Filling Method when the Difference Between the Target Upper Limit Composition and the Target Lower Limit Composition is 2 Mass %

[0166] In the filling method for a mixed refrigerant of the present invention in a case where a filling amount of the mixed refrigerant to a container is appropriately adjusted, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)2.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before carrying out the transferring and filling is set to x+y.sub.R (minimum value) to x mass % (maximum value).

[0167] a: Initial filling amount (mass %) in feeding container

[0168] x: Target upper limit composition (mass %, 10x91, except for a range where y.sub.R>0).

[0169] y.sub.R: Lower limit value of a gap between target upper limit composition and initial composition, which is a value represented by Expression (13).

[Math. 18]

1000y.sub.R=L.sub.Rx.sup.3+M.sub.Rx.sup.2+N.sub.RX+P.sub.R

L.sub.R=0.00005a+0.223

M.sub.R=0.0159a5.5003

N.sub.R=1.0799a+324.91

P.sub.R=2.771a2333.7(13)

[0170] According to the filling method for a mixed refrigerant of the present invention, even in a case where a filling amount of the mixed refrigerant in the feeding container is 100 mass % of a maximum filling amount, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out transferring and filling to a specific range, it is possible to keep compositional changes in a target container and equipment with a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0171] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling.

[0172] Further, the value of a is usually set within a range of 60a100.

[0173] Hereinafter, as an example of the transferring and filling method, a case where a handling temperature during transferring and filling is 40 C. is shown. For example, in the Japan's High Pressure Gas Safety Act, since handling of containers at 40 C. or higher is prohibited, a handling temperature during transferring and filling in Japan is, in particular, 0 C. to 40 C. As a temperature during transferring and filling (during handling) is higher, compositional changes due to the transferring and filling from start of the transferring and filling until completion thereof become larger in a case of carrying out the transferring and filling in a liquid from the feeding container to the target container and equipment. Therefore, conditions of transferring and filling at a handling temperature of 40 C. are applied, and thus such conditions are also applicable to a handling temperature of 0 C. to 40 C.

[0174] Further, regarding also a filling amount in the feeding container, as an initial filling amount is smaller, a range of compositional changes due to the transferring and filling from start of the transferring and filling until completion thereof become smaller in a case of carrying out transferring and filling in a liquid from the feeding container to the target container and equipment. Therefore, a mathematical expression satisfying a filling method in which an initial filling amount is a mass % also satisfies a filling method in which the initial filling amount is a mass % or less. For example, a mathematical expression satisfying a filling method in which an initial filling amount is 100 mass % also satisfies a filling method in which the initial filling amount is 100 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 90 mass % also satisfies a filling method in which the initial filling amount is 90 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 80 mass % also satisfies a filling method in which the initial filling amount is 80 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 70 mass % also satisfies a filling method in which the initial filling amount is 70 to 0 mass %. A mathematical expression satisfying a filling method in which an initial filling amount is 60 mass % also satisfies a filling method in which the initial filling amount is 60 to 0 mass %.

[0175] Liquid Phase Mixing Ratio of HFO-1123 in Mixed Refrigerant in Feeding Container

[0176] In the present invention, in order to be kept within a range from the target upper limit composition (x) of HFO-11232.0 mass % (target lower limit composition) to the target upper limit composition (x), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before transferring and filling is set to x+y.sub.R (minimum value) to x % (target upper limit composition).

[0177] x is a target upper limit composition, and y.sub.R is a gap between the target upper limit composition (x) and the initial composition. x+y.sub.R represents a minimum value of the liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container.

[0178] A difference between the target upper limit composition and the target lower limit composition is called a composition tolerance. The composition tolerance is determined in a case where a composition of a mixed refrigerant is registered in ASHRAE Standard 2013.

[0179] In a mixed refrigerant containing HFO-1123 and HFO-1234yf, a case where a mixing ratio of HFO-1123 and HFO-1234yf is, for example, 50:50 (mass %) will be described. In this mixed refrigerant (HFO-1123/HFO-1234yf), in a case where a composition tolerance is set to +1.0, 1.0/+1.0, 1.0, a target upper limit composition of HFO-1123 is 51.0 mass %, and a target lower limit composition of HFO-1123 is 49.0 mass %. Thus, the mixed refrigerant has a difference of 2 mass % between the target upper limit composition and the target lower limit composition.

(3-2) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 100 Mass % of Maximum Filling Amount

[0180] A case where a filling amount of a mixed refrigerant to a container is 100 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0181] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 11.4 mass % or 71.6 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 100 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)2.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.R1 to x mass %.

[0182] The above-mentioned x is a target upper limit composition (where x satisfies 10x11.4 or 71.6x91).

[0183] y.sub.R1 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (14).

[Math. 19]

1000y.sub.R1=0179x.sup.33.9228x.sup.2+217.07x2003.6(14)

[0184] In the present invention, from Expression (14), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x1.3 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0185] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0186] Further, in a case where HFO-1123 is contained in an amount of 91 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 1.3 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(3-3) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 90 Mass % of Maximum Filling Amount

[0187] A case where a filling amount of a mixed refrigerant to a container is 90 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0188] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 11.6 mass % or 73.0 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 90 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)2.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.R2 to x mass %.

[0189] The above-mentioned x is a target upper limit composition (where x satisfies 10x11.6 or 73.0x91).

[0190] y.sub.R2 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (15).

[Math. 20]

1000y.sub.R2=0.018x.sup.34.0497x.sup.2+227.82x215.7(15)

[0191] In the present invention, from Expression (15), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x1.3 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0192] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0193] Further, in a case where HFO-1123 is contained in an amount of 91 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 1.3 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(3-4) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 80 Mass % of Maximum Filling Amount

[0194] A case where a filling amount of a mixed refrigerant to a container is 80 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0195] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 11.0 mass % or 74.2 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 80 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)2.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.R3 to x mass %.

[0196] The above-mentioned x is a target upper limit composition (where x satisfies 10x11.0 or 74.2x91).

[0197] y.sub.R3 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (16).

[Math. 21]

1000y.sub.R3=0.0195x.sup.34.3007x.sup.2+240.96x2169.2(16)

[0198] In the present invention, from Expression (16), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x1.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0199] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0200] Further, in a case where HFO-1123 is contained in an amount of 91 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 1.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(3-5) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 70 Mass % of Maximum Filling Amount

[0201] A case where a filling amount of a mixed refrigerant to a container is 70 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0202] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 10.3 mass % to 75.9 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 70 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)2.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.R4 to x mass %.

[0203] The above-mentioned x is a target upper limit composition (where x satisfies 10x10.3 or 75.9x91).

[0204] y.sub.R4 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (17).

[Math. 22]

1000y.sub.R4=0.019x.sup.34.2905x.sup.2+243.57x2083(17)

[0205] In the present invention, from Expression (17), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x1.2 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0206] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0207] Further, in a case where HFO-1123 is contained in an amount of 92 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 1.2 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(3-6) Filling Method in Case where Filling Amount of Mixed Refrigerant to Container is 60 Mass % of Maximum Filling Amount

[0208] A case where a filling amount of a mixed refrigerant to a container is 60 mass % of a maximum filling amount, and a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in a feeding container allows HFO-1123 to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0209] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant, that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 77.9 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container, which is filled in an amount of 60 mass % or less of a maximum filling amount, to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from a target upper limit composition (x) of HFO-1123 to the target upper limit composition (x)2.0 mass % (target lower limit composition), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is preferably set to x+y.sub.R5 to x mass %.

[0210] The above-mentioned x is a target upper limit composition (where x satisfies 77.9x91).

[0211] y.sub.R5 is a lower limit value of a gap between the target upper limit composition and the initial composition and is a value represented by Expression (18).

[Math. 23]

1000y.sub.R5=0.0202x.sup.34.5952x.sup.2+263.19x2168.5(18)

[0212] In the present invention, from Expression (18), in a case of transferring and filling a HFO-1123/HFO-1234yf mixed refrigerant from a feeding container to a target container and equipment, by setting a liquid phase mixing ratio of HFO-1123 in the feeding container before carrying out the transferring and filling to about x1.1 mass % to x mass %, it is possible to keep compositional changes in the target container and equipment with a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

[0213] From the viewpoint that a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123, it is preferable to fill HFO-1123 more than a target composition in the feeding container before transferring and filling. In a filling method for a mixed refrigerant which allows compositional changes of the HFO-1123/HFO-1234yf mixed refrigerant in the target container and equipment to be kept within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of transferring and filling, an upper limit value of a liquid phase mixing ratio of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant is a target upper limit composition of HFO-1123.

[0214] Further, in a case where HFO-1123 is contained in an amount of 92 mass %, due to small compositional changes, even if an initial composition of HFO-1123 is about 1.1 mass % with respect to the target upper limit composition, it is possible to keep the liquid phase mixing ratio of HFO-1123 within a range from the target upper limit composition (x)2.0 mass % (target lower limit composition) to the target upper limit composition (x) until completion of the transferring and filling.

(3-7) Filling Method for Non-Azeotropic Mixed Refrigerant Containing HFO-1123 and HFO-1234yf

[0215] A filling method that allows a non-azeotropic mixed refrigerant composed of HFO-1123 and HFO-1234yf to be kept within a range from the target upper limit composition (x) of HFO-11232.0 mass % (target lower limit composition) to the target upper limit composition (x) will be described.

[0216] Expression (13) can be derived from Expressions (14) to (18). Based on values of coefficients of Expressions (14) to (18), L.sub.R to P.sub.R of Expression (13) can be derived from the target upper limit composition (x) with respect to the initial filling amount (a mass %).

[0217] In the filling method for a mixed refrigerant of the present invention, in a case of transferring and filling a mixed refrigerant that contains HFO-1123 and HFO-1234yf in which HFO-1123 is present in an amount of 10 to 91 mass %, in a liquid phase, with respect to a total 100 mass % of HFO-1123 and HFO-1234yf, in a liquid from a feeding container to a target container and equipment, in order to keep a liquid phase mixing ratio of HFO-1123 in the mixed refrigerant in the feeding container from start of the transferring and filling until completion thereof within a range from the target upper limit composition (x) of HFO-11232.0 mass % (target lower limit composition) to a target upper limit composition (x), a liquid phase mixing ratio (initial composition) of HFO-1123 in the mixed refrigerant in the feeding container immediately before the transferring and filling is set to x+y.sub.R (minimum value) to x (maximum value) mass %.

[0218] a: Initial filling amount (mass %) in feeding container

[0219] x: Target upper limit composition (mass %, 10x91, except for a range where y.sub.R>0).

[0220] y.sub.R: Lower limit value of a gap between target upper limit composition and initial composition, which is a value represented by Expression (13).

[Math. 24]

1000y.sub.R=L.sub.Rx.sup.3+M.sub.Rx.sup.2+N.sub.Rx+P.sub.R

L.sub.R=0.00005a+0.0223

M.sub.R=0.0159a5.5003

N.sub.R=1.0799a+324.91

P.sub.R=2.771a2333.7(13)

(4) Addition of Third Component

[0221] The present invention is, in particular, directed to a mixed composition containing a HFO-1123/HFO-1234yf mixed refrigerant in which HFO-1123 is present in an amount of 10 to 92 mass %. However, for the purpose of improving properties of the HFO-1123/HFO-1234yf mixed refrigerant, such as enhanced compatibility with refrigerating machine oil, suppressed flammability, reduced GWP, and enhanced refrigerating capacity, to the extent that compositional variation behaviors of the HFO-1123/HFO-1234yf mixed refrigerant is not greatly impaired, non-azeotropic compounds may be added and an addition amount thereof is desirably about 1 to 20 mass %. Non-azeotropic compounds are not particularly limited, and examples thereof include HFC such as HFC-32, HFC-125, HFC-152a, and HFC-143a, HFO such as HFO-1243zf and HFO-1225ye, isobutane, butane, propane, and CO.sub.2. One or two or more of these compounds may be mixed.

[0222] The supply-side container of the present invention is not particularly limited as long as it is a closed container capable of storing a refrigerant mixture, and examples thereof include a cylinder, a lorry, and a storage tank. In a case where a volume of the supply-side container is small and an extraction amount at one time is large, influences due to compositional variations are easily exhibited.

[0223] Further, in this method, as long as an initial filling amount of the supply-side container is 60 to 100 mass % of a maximum filling amount, transferring and filling may be carried out over several times until completion of the transferring and filling, and the transferring and filling can be interrupted in the middle without complete transferring and filling of a liquid phase.

[0224] Further, as equipment which a refrigerant mixture is transferred to and fills, it may be any apparatus that utilizes a vapor compression type refrigeration cycle, and the apparatus is not particularly limited. Examples thereof include a refrigeration air-conditioning apparatus, a refrigerator, and a hot water supply apparatus.

[0225] A vapor compression type refrigeration apparatus manufactured by the method of the present invention is composed of a refrigerant and a refrigeration-apparatus main body. The refrigeration-apparatus main body is not particularly limited, and a known refrigeration-apparatus main body is used as it is.

[0226] Means for transferring and filling may be in accordance with an ordinary method, and there is, for example, one utilizing a pressure difference and one using a pump or the like.

[0227] Further, for example, in the Japan's High Pressure Gas Safety Act, since handling of containers at 40 C. or higher is prohibited, a handling temperature during transferring and filling is basically 0 C. to 40 C. In addition, even in the International Laws, it is required to avoid handling at high temperature. As a temperature at during transferring and filling (during handling) is higher, compositional changes due to the transferring and filling become larger. Therefore, conditions of transferring and filling at a handling temperature of 40 C. are applied, and thus such conditions are also applicable to a handling temperature of 0 C. to 40 C.

EXAMPLES

[0228] Hereinafter, the present invention will be described in accordance with examples in which the filling method for a mixed refrigerant according to the embodiment of the present invention is carried out. However, the present invention is not limited to these examples as long as it does not depart from the gist of the present invention.

[0229] First, reference examples to be compared with the examples will be described.

(1) Reference Example 1

[0230] A 10 L closed container was filled with trifluoroethylene (HFO-1123) and 2,3,3,3-tetrafluoropropene (HFO-1234yf) in a composition immediately before transferring and filling at a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. The maximum fillable amount is determined by law and is calculated as follows. [0231] G=V/C [0232] G: Mass of fluorocarbon (kg) [0233] V: Internal volume of container (L) [0234] C: Constant depending on type of fluorocarbon

[0235] In this case, a filling constant C is defined in Japan as a value obtained by dividing 1.05 by a specific gravity of gas in question at 48 C.

[0236] In addition, in a case involving exports, according to the International Law, this filling constant C is defined as a value obtained by dividing 1.05 by a specific gravity of gas in question at 65 C. in a case of passing through tropical regions, and is defined as a value obtained by dividing 1.05 by a specific gravity of gas in question at 45 C. for other regions except the tropics.

[0237] This time, a value obtained by dividing 1.05 by a specific gravity of gas in question at 45 C. or 65 C. was adopted as the filling constant.

[0238] Further, the reason why 40 C. was chosen as a temperature during transferring and filling is because data at 40 C. is assumed as a case with the worst condition, from the viewpoints that in the Japan's High Pressure Gas Safety Act, handling of containers above 40 C. is prohibited; it is required to avoid handling at high temperature even in the International Law or the like; and compositional changes increase as a temperature rises, data at 40 C. is assumed as a case with the worst condition.

[0239] Next, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump. A part of the gas was collected from a sampling valve provided in the middle of a liquid side extraction pipe, and componential composition thereof was analyzed by gas chromatography.

[0240] Table 1 shows the results of compositional changes of Reference Example 1 during transferring and filling in case of being filled at a filling amount that is calculated by using, as a filling constant, a value obtained by dividing 1.05 by a specific gravity of the gas in question at 45 C.

TABLE-US-00001 TABLE 1 Difference between Composition target upper HFO-1123 HFO-1123 Gap from at liquid limit composition HFO-1123 HFO-1123 composition composition HFO-1123 disappearance HFO-1123 and target target upper target lower before at time of target upper target lower Filling target lower limit limit limit transferring liquid limit limit amount composition composition composition composition and filling disappearance composition composition Mass % Mass % Mass % Mass % Mass % Mass % Mass % Mass % : , <: X 100 70 4 72.0 68.0 72.0 70.0 2.0 100 70 4 72.0 68.0 71.0 68.9 3.1 100 70 4 72.0 68.0 70.0 67.9 4.1 X 100 40 4 42.0 38.0 42.0 38.5 3.5 100 40 4 42.0 38.0 41.0 37.5 4.5 X 100 40 4 42.0 38.0 40.0 36.5 5.6 X 100 40 4 42.0 38.0 39.0 35.4 6.6 X 100 80 3 81.5 78.5 81.5 80.2 1.3 100 80 3 81.5 78.5 81.0 79.6 1.9 100 80 3 81.5 78.5 80.0 78.6 2.9 100 80 3 81.5 78.5 79.0 77.4 4.1 X 100 70 3 71.5 68.5 71.0 68.9 2.6 100 70 3 71.5 68.5 69.0 66.8 4.7 X 100 40 3 41.5 38.5 41.5 37.9 3.6 X 100 40 3 41.5 38.5 40.0 36.5 5.1 X 100 80 2 81.0 79.0 81.0 79.6 1.4 100 80 2 81.0 79.0 80.0 78.6 2.4 X 100 50 2 51.0 49.0 51.0 47.6 3.4 X 100 12 2 13.0 11.0 13.0 10.9 2.1 X 100 12 2 13.0 11.0 12.0 10.0 3.0 X 60 70 4 72.0 68.0 72.0 69.4 2.6 60 70 4 72.0 68.0 71.0 68.3 3.7 60 70 4 72.0 68.0 70.0 67.2 4.8 X 60 40 4 42.0 38.0 42.0 37.3 4.3 X 60 40 4 42.0 38.0 41.0 36.7 5.3 X 60 40 4 42.0 38.0 40.0 35.7 6.3 X 60 40 4 42.0 38.0 39.0 34.8 7.3 X 60 80 3 81.5 78.5 81.5 79.8 1.7 60 80 3 81.5 78.5 81.0 79.2 2.3 60 80 3 81.5 78.5 80.0 78.1 3.4 X 60 80 3 81.5 78.5 79.0 77.0 4.5 X 60 70 3 71.5 68.5 71.0 68.3 3.2 X 60 70 3 71.5 68.5 69.0 66.1 5.4 X 60 40 3 41.5 38.5 41.5 37.1 4.4 X 60 40 3 41.5 38.5 40.0 35.7 5.8 X 60 80 2 81.0 79.0 81.0 79.2 1.8 60 80 2 81.0 79.0 80.0 78.1 2.9 X 60 50 2 51.0 49.0 51.0 46.9 4.1 X 60 12 2 13.0 11.0 13.0 10.5 2.5 X 60 12 2 13.0 11.0 12.0 9.7 3.3 X

[0241] From Table 1, it was found that a concentration of HFO-1123 in the HFO-1123/HFO-1234yf mixed refrigerant at the time of completion of transferring and filling (at the time of liquid disappearance) is lower than that at start of the transferring and filling. This is because a boiling point of HFO-1123 is lower than that of HFO-1234yf, and, during the transferring and filling, in a case where a space generated by extraction of a refrigerant is replenished by evaporation from a liquid phase side, a concentration of HFO-1123 in the liquid phase decreases due to more evaporation of HFO-1123. Therefore, it was found that it is preferable to fill more than a target composition in the feeding container before transferring and filling of HFO-1123.

[0242] From Table 1, in a case where there is a certain target composition and a compositional range of upper and lower limits including the target composition is set to 2 to 4, in a case of initiating transferring and filling by using a certain composition within the compositional range as an initial composition without taking any measures, there is a possibility that a composition at the time of completion of the transferring and filling (at the time of liquid disappearance) becomes equal to or less than a target lower limit composition. As a result, refrigerating capacity and refrigerant capability, such as COP, which are anticipated with the target composition, cannot be guaranteed from start of the transferring and filling to completion of the transferring and filling.

[0243] Therefore, in a case of setting a target composition, and a target upper limit composition and a target lower limit composition including the target composition, the present inventors have clarified how to set an initial composition in the compositional range, so that all the compositions from start of the transferring and filling to completion of the transferring and filling can be kept within the target lower limit composition to the target upper limit composition.

(2) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 4 Mass %

(2-1) Example 1: Initial Filling Amount in Feeding Container is 100 Mass % of Maximum Filling Amount

[0244] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at a maximum fillable amount (filling amount of 100 mass %) such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Reference Example 1, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 2 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00002 TABLE 2 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 92.0 91.5 1.5 80.0 82.0 80.8 0.8 70.0 72.0 70.0 0.0 60.0 62.0 59.3 0.7 50.0 52.0 48.7 1.3 40.0 42.0 38.5 1.5 30.0 32.0 28.6 1.5 20.0 22.0 18.9 1.1 10.0 12.0 10.0 0.0

[0245] As shown in Table 2, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 92 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition.

[0246] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.P1) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 3.

TABLE-US-00003 TABLE 3 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 92.0 88.8 88.0 3.2 82.0 79.5 78.0 2.5 72.0 70.2 68.0 1.8 62.0 60.8 58.0 1.2 52.0 51.3 48.0 0.7 42.0 41.6 38.0 0.5 32.0 31.6 28.0 0.4 22.0 21.0 18.0 1.1 12.0 9.7 8.0 2.3

[0247] From these results, compositional variations of HFO-1123 is the smallest in the target composition of 92 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 3.2 mass % of the target composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0248] Further, from these results, the lower limit value (y.sub.P1) of the gap between the target upper limit composition and the initial composition can be represented by the following expression using the target composition (x).

[Math. 25]

1000y.sub.P1=0.0033x.sup.30.8601x.sup.2+55.026x4187.6(2)

[0249] From Table 1, a question as to where the target composition should be set between the target lower limit and the target upper limit was raised. By setting the lower limit value (y.sub.P1) based on Table 3, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0250] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.P1 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(2-2) Example 2: Initial Filling Amount in Feeding Container is 90 Mass % of Maximum Filling Amount

[0251] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 90 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 1, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 4 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00004 TABLE 4 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 92.0 91.5 1.5 80.0 82.0 80.7 0.7 70.0 72.0 69.9 0.1 60.0 62.0 59.2 0.8 50.0 52.0 48.7 1.3 40.0 42.0 38.4 1.7 30.0 32.0 28.5 1.5 20.0 22.0 19.0 1.1 10.0 12.0 10.0 0.0

[0252] As shown in Table 4, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 92 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition.

[0253] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.P2) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 5.

TABLE-US-00005 TABLE 5 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 92.0 88.9 88.0 3.2 82.0 79.6 78.0 2.5 72.0 70.3 68.0 1.8 62.0 60.9 58.0 1.2 52.0 51.4 48.0 0.6 42.0 41.6 38.1 0.4 32.0 31.6 28.0 0.4 22.0 21.0 18.0 1.0 12.0 9.8 8.0 2.3

[0254] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 92 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 3.2 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0255] Further, from these results, the lower limit value (y.sub.P2) of the gap between the target upper limit composition and the initial composition can be represented by the following expression using the target upper limit composition (x).

[Math. 26]

1000y.sub.P2=0.0037x.sup.30.9392x.sup.2+59.651x4243(3)

[0256] By setting the lower limit value (y.sub.P2) based on Table 5, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0257] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.P2 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(2-3) Example 3: Initial Filling Amount in Feeding Container is 80 Mass % of Maximum Filling Amount

[0258] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 80 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 1, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 6 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00006 TABLE 6 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 92.0 91.4 1.4 80.0 82.0 80.7 0.7 70.0 72.0 69.9 0.2 60.0 62.0 59.1 1.0 50.0 52.0 48.5 1.5 40.0 42.0 38.2 1.8 30.0 32.0 218.4 1.7 20.0 22.0 18.8 1.2 10.0 12.0 9.9 0.1

[0259] As shown in Table 6, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 92 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition.

[0260] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.P3) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 7.

TABLE-US-00007 TABLE 7 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 92.0 88.9 88.0 3.2 82.0 79.7 78.0 2.3 72.0 70.4 68.0 1.7 62.0 61.0 57.0 1.0 52.0 51.5 48.0 0.5 42.0 41.8 38.0 0.2 32.0 31.7 28.0 0.3 22.0 21.2 18.0 0.9 12.0 9.8 8.0 2.2

[0261] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 92 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 3.2 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0262] Further, from these results, the lower limit value (y.sub.P3) of the gap between the target upper limit composition and the initial composition can be represented by Expression (4) using the target upper limit composition (x).

[Math. 27]

1000y.sub.P3=0.0038x.sup.30.979x.sup.2+62.141x4268.4(4)

[0263] By setting the lower limit value (y.sub.P3) based on Table 7, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0264] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.P3 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(2-4) Example 4: Initial Filling Amount in Feeding Container is 70 Mass % of Maximum Filling Amount

[0265] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 70 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 1, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 8 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00008 TABLE 8 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 92.0 91.4 1.4 80.0 82.0 80.6 0.6 70.0 72.0 69.6 0.4 60.0 62.0 58.9 1.1 50.0 52.0 48.3 1.7 40.0 42.0 38.0 2.0 30.0 32.0 28.1 1.9 20.0 22.0 18.6 1.4 10.0 12.0 9.8 0.2

[0266] As shown in Table 8, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 92 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition.

[0267] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.P4) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 9.

TABLE-US-00009 TABLE 9 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 92.0 89.0 88.0 3.1 82.0 79.7 78.0 2.3 72.0 70.5 68.0 1.5 62.0 61.2 58.0 0.8 52.0 51.7 48.0 0.3 42.0 42.0 38.0 0.0 32.0 31.9 28.0 0.1 22.0 21.2 18.0 0.8 12.0 9.9 8.0 2.2

[0268] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 92 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 3.1 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0269] Further, from these results, the lower limit value (y.sub.P4) of the gap between the target upper limit composition and the initial composition can be represented by Expression (5) using the target upper limit composition (x).

[Math. 28]

1000y.sub.P4=0.41x.sup.31.059x.sup.2+67,479x4314.9(5)

[0270] By setting the lower limit value (y.sub.P4) based on Table 9, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0271] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.P4 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(2-5) Example 5: Initial Filling Amount in Feeding Container is 60 Mass % of Maximum Filling Amount

[0272] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 60 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 1, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 10 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00010 TABLE 10 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 92.0 91.3 1.3 80.0 82.0 80.4 0.4 70.0 72.0 69.4 0.6 60.0 62.0 58.6 1.4 50.0 52.0 47.9 2.1 40.0 42.0 37.7 2.3 30.0 32.0 27.8 2.2 20.0 22.0 18.4 1.6 10.0 12.0 9.7 0.3

[0273] As shown in Table 10, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 28.7 mass % or 54.0 to 92 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition.

[0274] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.P5) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 11.

TABLE-US-00011 TABLE 11 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (ya) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 92.0 89.0 88.0 3.0 82.0 79.9 78.0 2.1 72.0 70.8 68.0 1.3 62.0 61.5 58.0 0.5 54.0 54.0 48.0 0.0 28.7 28.7 28.0 0.0 22.0 21.5 18.0 0.5 12.0 10.0 8.0 2.0

[0275] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 92 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 3.0 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0276] Further, from these results, the lower limit value (y.sub.P5) of the gap between the target upper limit composition and the initial composition can be represented by the following expression using the target upper limit composition (x).

[Math. 29]

1000y.sub.P5=00039x.sup.31.0614x.sup.2+9.262x4292.6(6)

By setting the lower limit value (y.sub.P5) based on Table 11, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0277] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.P5 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition4.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(3) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 3 Mass %

(3-1) Example 6: Initial Filling Amount in Feeding Container is 100 Mass % of Maximum Filling Amount

[0278] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at a maximum fillable amount (filling amount of 100 mass %) such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Reference Example 1, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 12 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00012 TABLE 12 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.5 90.9 0.9 80.0 81.5 80.2 0.2 70.0 71.5 69.4 0.6 60.0 61.5 58.7 1.3 50.0 51.5 48.3 1.7 40.0 41.5 37.9 2.1 30.0 31.5 27.9 2.1 20.0 21.5 18.5 1.5 10.0 11.5 9.6 0.4

[0279] As shown in Table 12, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 91.5 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition.

[0280] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.Q1) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 13.

TABLE-US-00013 TABLE 13 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.5 89.3 88.5 2.2 81.5 80.0 78.5 1.6 71.5 70.7 68.5 0.8 61.5 61.3 58.5 0.2 57.3 57.3 54.3 0.0 22.9 22.9 19.9 0.0 11.5 10.3 8.5 1.3

[0281] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91.5 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 2.2 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0282] Further, from these results, the lower limit value (y.sub.Q1) of the gap between the target upper limit composition and the initial composition can be represented by the following expression using the target upper limit composition (x).

[Math. 30]

1000y.sub.Q1=0.0041x.sup.a0.9955x.sup.2+60.515x3228.6(8)

[0283] By setting the lower limit value (y.sub.Q1) based on Table 13, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0284] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.Q1 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(3-2) Example 7: Initial Filling Amount in Feeding Container is 90 Mass % of Maximum Filling Amount

[0285] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 90 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 6, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 14 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00014 TABLE 14 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.5 90.9 0.9 80.0 81.5 80.1 0.1 70.0 71.5 69.4 0.6 60.0 61.5 58.7 1.4 50.0 51.5 48.1 1.9 40.0 41.5 37.9 2.1 30.0 31.5 27.9 2.1 20.0 21.5 18.5 1.5 10.0 11.5 9.5 0.5

[0286] As shown in Table 14, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 22.2 mass % or 59.4 to 91.5 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition.

[0287] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.Q2) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 15.

TABLE-US-00015 TABLE 15 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.5 89.3 88.5 2.2 81.5 80.0 78.5 1.5 71.5 70.8 68.5 0.8 61.5 61.4 58.5 0.1 59.4 59.4 56.4 0.0 22.2 22.2 19.2 0.0 11.5 10.3 8.5 1.2

[0288] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91.5 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 2.2 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0289] Further, from these results, the lower limit value (y.sub.Q2) of the gap between the target upper limit composition and the initial composition can be represented by the following expression using the target upper limit composition (x).

[Math. 31]

1000y.sub.Q2=0.0038x.sup.30.9548x.sup.2+59.27x3212.2(9)

[0290] By setting the lower limit value (y.sub.Q2) based on Table 15, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0291] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.Q2 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(3-3) Example 8: Initial Filling Amount in Feeding Container is 80 Mass % of Maximum Filling Amount

[0292] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 80 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 6, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 16 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00016 TABLE 16 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.5 90.8 0.8 80.0 81.5 80.0 0.0 70.0 71.5 69.2 0.8 60.0 61.5 58.5 1.5 50.0 51.5 48.0 2.0 40.0 41.5 37.7 2.3 30.0 31.5 27.8 2.2 20.0 21.5 18.3 1.7 10.0 11.5 9.5 0.6

[0293] As shown in Table 16, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 22.2 mass % or 59.4 to 91.5 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition.

[0294] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.Q3) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 17.

TABLE-US-00017 TABLE 17 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.5 89.4 88.5 2.2 81.5 80.1 78.5 1.4 71.5 70.8 68.5 0.7 59.4 59.4 56.4 0.0 22.2 22.2 19.2 0.0 11.5 10.4 8.5 1.1

[0295] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91.5 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 2.2 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0296] Further, from these results, the lower limit value (y.sub.Q3) of the gap between the target upper limit composition and the initial composition can be represented by Expression (10) using the target upper limit composition (x).

[Math. 32]

1000y.sub.Q3=0.0035x.sup.30.9196x.sup.2+57,749x3152.4(10)

[0297] By setting the lower limit value (y.sub.Q3) based on Table 17, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0298] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.Q3 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(3-4) Example 9: Initial Filling Amount in Feeding Container is 70 Mass % of Maximum Filling Amount

[0299] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 70 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 6, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 18 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00018 TABLE 18 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.5 90.8 0.8 80.0 81.5 79.9 0.1 70.0 71.5 69.1 0.9 60.0 61.5 58.3 1.7 50.0 51.5 47.8 2.2 40.0 41.5 37.5 2.5 30.0 31.5 27.6 2.4 20.0 21.5 18.3 1.8 10.0 11.5 9.4 0.6

[0300] As shown in Table 18, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 20.3 mass % or 61.2 to 91.5 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition.

[0301] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.Q4) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 19.

TABLE-US-00019 TABLE 19 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.5 89.4 88.5 2.1 81.5 80.2 78.5 1.3 71.5 71.0 68.5 0.5 61.2 61.2 58.2 0.0 20.3 20.3 17.3 0.0 11.5 10.5 8.5 1.1

[0302] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91.5 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 2.1 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0303] Further, from these results, the lower limit value (y.sub.Q4) of the gap between the target upper limit composition and the initial composition can be represented by Expression (11) using the target upper limit composition (x).

[Math. 33]

1000y.sub.Q4=0.003x.sup.30.8664x.sup.2+57.441x3154.1(11)

[0304] By setting the lower limit value (y.sub.Q4) based on Table 19, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0305] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.Q4 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(3-5) Example 10: Initial Filling Amount in Feeding Container is 60 Mass % of Maximum Filling Amount

[0306] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 60 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 6, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 20 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00020 TABLE 20 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.5 90.7 0.7 80.0 81.5 79.8 0.2 70.0 71.5 68.8 1.2 60.0 61.5 58.0 2.0 50.0 51.5 47.5 2.5 40.0 41.5 37.1 2.9 30.0 31.5 27.3 2.7 20.0 21.5 18.0 2.0 10.0 11.5 9.2 0.8

[0307] As shown in Table 20, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 17.0 mass % or 67.3 to 91.5 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition.

[0308] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.Q5) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 21.

TABLE-US-00021 TABLE 21 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (yb) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.5 89.5 88.5 2.0 81.5 80.4 78.5 1.2 71.5 71.2 68.5 0.3 67.3 67.3 64.3 0.0 17.0 17.0 14.0 0.0 11.5 10.6 8.5 0.9

[0309] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91.5 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 2.0 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0310] Further, from these results, the lower limit value (y.sub.Q5) of the gap between the target upper limit composition and the initial composition can be represented by Expression (12) using the target upper limit composition (x).

[Math. 34]

1000Y.sub.Q5=0.0028x.sup.30.8507x.sup.2+57.326x3105.5(12)

[0311] By setting the lower limit value (y.sub.Q5) based on Table 21, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0312] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.Q5 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition3.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(4) Filling Method in Case where Difference Between Target Upper Limit Composition and Target Lower Limit Composition is 2 Mass %

(4-1) Example 11: Initial Filling Amount in Feeding Container is 100 Mass % of Maximum Filling Amount

[0313] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at a maximum fillable amount (filling amount of 100 mass %) such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Reference Example 1, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 22 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00022 TABLE 22 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.0 90.3 0.3 80.0 81.0 79.6 0.4 70.0 71.0 68.8 1.2 60.0 61.0 58.2 1.8 50.0 51.0 47.6 2.4 40.0 41.0 37.4 2.6 30.0 31.0 27.4 2.6 20.0 21.0 18.0 2.0 10.0 11.0 9.1 0.9

[0314] As shown in Table 22, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 11.4 mass % or 71.6 to 91 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition.

[0315] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.R1) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 23.

TABLE-US-00023 TABLE 23 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.0 89.8 89.0 1.3 81.0 80.4 79.0 0.6 71.6 71.6 69.6 0.0 11.4 11.4 9.4 0.0 11.0 10.9 9.0 0.1

[0316] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 1.3 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0317] Further, from these results, the lower limit value (y.sub.R1) of the gap between the target upper limit composition and the initial composition can be represented by Expression (14) using the target upper limit composition (x).

[Math. 35]

1000y.sub.R1=0.0029x.sup.30.7982x.sup.2+49.947x2063.8(14)

[0318] By setting the lower limit value (y.sub.R1) based on Table 23, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0319] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.R1 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(4-2) Example 12: Initial Filling Amount in Feeding Container is 90 Mass % of Maximum Filling Amount

[0320] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 90 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 11, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 24 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00024 TABLE 24 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition at HFO-1123 target transferring time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.0 90.3 0.3 80.0 81.0 79.6 0.4 70.0 71.0 68.8 1.2 60.0 61.0 58.2 1.8 50.0 51.0 47.6 2.4 40.0 41.0 37.4 2.6 30.0 31.0 27.4 2.6 20.0 21.0 18.0 2.0 10.0 11.0 9.1 0.9

[0321] As shown in Table 24, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 11.6 mass % or 73.0 to 91 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition.

[0322] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.R2) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 25.

TABLE-US-00025 TABLE 25 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.0 89.8 89.0 1.3 81.0 80.5 79.0 0.5 73.0 73.0 71.0 0.0 11.6 11.6 9.6 0.0 11.0 10.9 9.0 0.1

[0323] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 1.3 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0324] Further, from these results, the lower limit value (y.sub.R2) of the gap between the target upper limit composition and the initial composition can be represented by Expression (15) using the target upper limit composition (x).

[Math. 36]

1000y.sub.R2=0.0034x.sup.30.8718x.sup.2+54.09x2111.2(15)

[0325] By setting the lower limit value (y.sub.R2) based on Table 25, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0326] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.R2 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(4-3) Example 13: Initial Filling Amount in Feeding Container is 80 Mass % of Maximum Filling Amount

[0327] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 80 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 11, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 26 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00026 TABLE 26 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.0 90.3 0.3 80.0 81.0 79.5 0.5 70.0 71.0 68.7 1.3 60.0 61.0 58.0 2.0 50.0 51.0 47.5 2.5 40.0 41.0 37.2 2.8 30.0 31.0 27.4 2.6 20.0 21.0 17.9 2.1 10.0 11.0 9.1 0.9

[0328] As shown in Table 26, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 11.0 mass % or 74.2 to 91 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition.

[0329] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.R3) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 27.

TABLE-US-00027 TABLE 27 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.0 89.8 89.0 1.2 81.0 80.6 79.0 0.5 74.2 74.2 72.2 0.0 11.0 11.0 9.0 0.1

[0330] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 1.2 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0331] Further, from these results, the lower limit value (y.sub.R3) of the gap between the target upper limit composition and the initial composition can be represented by Expression (16) using the target upper limit composition (x).

[Math. 37]

1000=0.0035x.sup.30.9143x.sup.2+56.832x2123.8(16)

[0332] By setting the lower limit value (y.sub.R3) based on Table 27, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0333] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.R3 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(4-4) Example 14: Initial Filling Amount in Feeding Container is 70 Mass % of Maximum Filling Amount

[0334] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 70 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 11, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 28 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00028 TABLE 28 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.0 90.3 0.3 80.0 81.0 79.4 0.6 70.0 71.0 68.6 1.5 60.0 61.0 57.8 2.2 50.0 51.0 47.3 2.7 40.0 41.0 37.0 3.0 30.0 31.0 27.1 2.9 20.0 21.0 17.7 2.3 10.0 11.0 9.0 1.1

[0335] As shown in Table 28, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 10 to 10.3 mass % or 75.9 to 91 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition.

[0336] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.R4) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 29.

TABLE-US-00029 TABLE 29 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.0 89.9 89.0 1.2 81.0 80.7 79.0 0.3 75.9 75.9 73.9 0.0 10.3 10.3 8.3 0.0

[0337] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 1.2 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0338] Further, from these results, the lower limit value (y.sub.R4) of the gap between the target upper limit composition and the initial composition can be represented by Expression (17) using the target upper limit composition (x).

[Math. 38]

1000y.sub.R4=0.0041x.sup.31.0207x.sup.2+62.608x2182.2(17)

[0339] By setting the lower limit value (y.sub.R4) based on Table 29, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0340] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.R4 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(4-5) Example 15: Initial Filling Amount in Feeding Container is 60 Mass % of Maximum Filling Amount

[0341] A 10 L closed container was filled with HFO-1234yf and HFO-1123 in a composition before transferring and filling at 60 mass % of a maximum fillable amount such that a liquid phase thereof has a certain composition at 40 C., and the container was kept at 40 C. In this case, an initial composition in the liquid phase of HFO-1123 before the transferring and filling was adjusted so as to be the target upper limit composition. Next, similarly to Example 11, transferring and filling was gradually carried out from a liquid side to another empty container by using a pump, and a componential composition was analyzed. Table 30 shows the results of compositional changes during the transferring and filling in a case of being adjusted to the target upper limit composition.

TABLE-US-00030 TABLE 30 HFO-1123 composition HFO-1123 Gap from HFO-1123 before composition HFO-1123 target transferring at time of liquid target composition and filling disappearance composition Mass % Mass % Mass % Mass % 90.0 91.0 90.2 0.2 80.0 81.0 79.2 0.8 70.0 71.0 68.3 1.7 60.0 61.0 57.5 2.5 50.0 51.0 46.9 3.1 40.0 41.0 36.7 3.3 30.0 31.0 26.9 3.1 20.0 21.0 17.6 2.4 10.0 11.0 8.8 1.2

[0342] As shown in Table 30, in a case where, by setting the initial composition before the transferring and filling to the target upper limit composition, a HFO-1123 composition is allowed to be in a range of 77.9 to 91 mass % in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf in a composition thereof from beginning of filling (before the transferring and filling) until disappearance of liquid (until completion of the transferring and filling), HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition.

[0343] Further, a composition of HFO-1123 in a liquid phase mixed refrigerant of HFO-1123/HFO-1234yf before the transferring and filling was obtained, so that the composition of HFO-1123 allows a composition of HFO-1123 at the time of completion of the transferring and filling to become the target lower limit composition. A lower limit value (y.sub.R5) of a gap between the target upper limit composition and the initial composition at this time is shown in Table 31.

TABLE-US-00031 TABLE 31 HFO-1123 Lower limit value HFO-1123 composition HFO-1123 (y) of gap from target before composition HFO-1123 upper limit transferring at time of liquid target upper limit composition and filling disappearance composition Mass % Mass % Mass % Mass % 91.0 90.0 89.0 1.1 81.0 80.8 79.0 0.2 77.9 77.9 75.9 0.0

[0344] From these results, compositional variations of HFO-1123 is the smallest in the target upper limit composition of 91 mass %, and, even in a case where an initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf is set to 1.1 mass % of the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

[0345] Further, from these results, the lower limit value (y.sub.R5) of the gap between the target upper limit composition and the initial composition can be represented by Expression (18) using the target upper limit composition (x).

[Math. 39]

10000y.sub.R5=0.0045x.sup.31.103x.sup.2+66.683x2160(18)

[0346] By setting the lower limit value (y.sub.R5) based on Table 31, it is possible to keep all compositions from start of the transferring and filling until completion of the transferring and filling within the target lower limit composition to the target upper limit composition for any target upper limit composition.

[0347] Therefore, by setting the initial composition of HFO-1123 in the liquid phase mixed refrigerant of HFO-1123/HFO-1234yf to the target upper limit composition+y.sub.R5 to the target upper limit composition, HFO-1123 can be kept within a range from the target upper limit composition2.0 mass % (target lower limit composition) to the target upper limit composition from before the transferring and filling until completion of the transferring and filling.

(5) Consideration

[0348] As is clear from the results of the above examples, according to the filling method for a mixed refrigerant of the present invention, there has been provided a new filling method of a non-azeotropic mixed refrigerant which allows compositional changes due to transferring and filling to be kept within a certain range with respect to an intended composition from before the transferring and filling until completion of the transferring and filling, and enables use of an entire amount of a liquid phase, as compared with a case where transferring and filling is carried out without taking any measures.

[0349] By carrying out the method of the present invention, it is meaningful that compositional changes occurring during transferring and filling of a non-azeotropic HFO-1234yf/HFO-1123 mixed refrigerant used as a working fluid for a vapor compression type refrigeration cycle can be kept within a range that does not cause impairment of refrigerant capability.

[0350] While the present invention has been described in detail and with reference to specific embodiments, it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention. The present application is based on Japanese patent application (Japanese Patent Application No. 2016-7438) filed on Jan. 18, 2016, the contents of which are incorporated herein by reference.