An object of the present disclosure is to provide a composition in which disproportionation of a refrigerant is suppressed, a heat cycle system using the composition, and a method for suppressing a disproportionation reaction of a refrigerant. A composition comprising a refrigerant and a refrigeration oil, the refrigerant comprising at least one refrigerant selected from the group consisting of HFO-1141, HFO-1132(E/Z), HFO-1132a, HFO-1123, and FO-1114, the refrigeration oil having a contact angle with a substrate of 0.1°≤Θ≤90°, the substrate comprising at least one member selected from the group consisting of engineering plastics, organic films, inorganic films, glass, and metals.

An inside air-conditioning device includes a refrigerant circuit (50) and a refrigerant that is sealed in the refrigerant circuit (50). The refrigerant circuit (50) includes a compressor (10), a condenser (25), an electronic expansion valve (13), and an evaporator (17). The refrigerant contains at least 1,2-difluoroethylene.

An inside air-conditioning device includes a refrigerant circuit (50) and a refrigerant that is sealed in the refrigerant circuit (50). The refrigerant circuit (50) includes a compressor (10), a condenser (25), an electronic expansion valve (13), and an evaporator (17). The refrigerant contains at least 1,2-difluoroethylene.

Provided is a fluorine-containing ether compound capable of forming a lubricant layer having excellent wear resistance even when the thickness is thin, and suitable as a material of a lubricant for a magnetic recording medium. The fluorine-containing ether compound is a compound represented by the following formula (1): R.sup.1—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4—R.sup.5; wherein R.sup.3 is a perfluoropolyether chain; R.sup.1 is a terminal group bonded to R.sup.2; R.sup.5 is a terminal group bonded to R.sup.4; R.sup.1 is an alkenyl group or an alkynyl group; R.sup.5 is a group containing a heterocyclic ring; R.sup.2 is represented by the following formula (2); R.sup.4 is represented by the following formula (3); and a in the formula (2) and b in the formula (3) are each independently an integer of 1 to 3. ##STR00001##

Provided is a fluorine-containing ether compound capable of forming a lubricant layer having excellent wear resistance even when the thickness is thin, and suitable as a material of a lubricant for a magnetic recording medium. The fluorine-containing ether compound is a compound represented by the following formula (1): R.sup.1—R.sup.2—CH.sub.2—R.sup.3—CH.sub.2—R.sup.4—R.sup.5; wherein R.sup.3 is a perfluoropolyether chain; R.sup.1 is a terminal group bonded to R.sup.2; R.sup.5 is a terminal group bonded to R.sup.4; R.sup.1 is an alkenyl group or an alkynyl group; R.sup.5 is a group containing a heterocyclic ring; R.sup.2 is represented by the following formula (2); R.sup.4 is represented by the following formula (3); and a in the formula (2) and b in the formula (3) are each independently an integer of 1 to 3. ##STR00001##

A refrigerant compressor includes: a sealed container in which refrigerating machine oil is stored; an electric element accommodated in the sealed container and driven by electric power supplied from outside; and a compression element accommodated in the sealed container and covered with the refrigerating machine oil, the compression element being driven by the electric element to compress refrigerant gas supplied from outside. The refrigerating machine oil contains an oil film shortage adjusting agent in a dissolved state in such a concentration that deposition of the oil film shortage adjusting agent does not occur at least while the refrigerant compressor is operating.

A refrigerant compressor includes: a sealed container in which refrigerating machine oil is stored; an electric element accommodated in the sealed container and driven by electric power supplied from outside; and a compression element accommodated in the sealed container and covered with the refrigerating machine oil, the compression element being driven by the electric element to compress refrigerant gas supplied from outside. The refrigerating machine oil contains an oil film shortage adjusting agent in a dissolved state in such a concentration that deposition of the oil film shortage adjusting agent does not occur at least while the refrigerant compressor is operating.

The present disclosure provides a composition comprising a refrigerant that has characteristics of having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A, and having a sufficiently low GWP. More specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (HFC-32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the total concentration of the three components is 99.5% by mass or more, based on the entire refrigerant, and three components have a mass ratio that falls within a region surrounded by a figure passing through the following 4 points in a ternary composition diagram whose three vertices represent the three components: point A (HFO-1132(E)/HFC-32/HFO-1234yf=51.8/1.0/47.2 mass %), point B (HFO-1132(E)/HFC-32/HFO-1234yf=35.3/1.0/63.7 mass %), point C (HFO-1132(E)/HFC-32/HFO-1234yf=10.1/18.0/71.9 mass %), and point D (HFO-1132(E)/HFC-32/HFO-1234yf=27.8/18.0/54.2 mass %).

The present disclosure provides a composition comprising a refrigerant that has characteristics of having a coefficient of performance (COP) and a refrigerating capacity equivalent to or higher than those of R404A, and having a sufficiently low GWP. More specifically, the present disclosure provides a composition comprising a refrigerant, the refrigerant comprising trans-1,2-difluoroethylene (HFO-1132(E)), difluoromethane (HFC-32), and 2,3,3,3-tetrafluoropropene (HFO-1234yf), wherein the total concentration of the three components is 99.5% by mass or more, based on the entire refrigerant, and three components have a mass ratio that falls within a region surrounded by a figure passing through the following 4 points in a ternary composition diagram whose three vertices represent the three components: point A (HFO-1132(E)/HFC-32/HFO-1234yf=51.8/1.0/47.2 mass %), point B (HFO-1132(E)/HFC-32/HFO-1234yf=35.3/1.0/63.7 mass %), point C (HFO-1132(E)/HFC-32/HFO-1234yf=10.1/18.0/71.9 mass %), and point D (HFO-1132(E)/HFC-32/HFO-1234yf=27.8/18.0/54.2 mass %).

The present disclosure addresses the problem of providing a refrigerant composition that has a low GWP and a refrigerating capacity equivalent to that of R404A, which is currently widely used. As a solution to the problem, the present disclosure provides a composition containing carbon dioxide and a mixture of fluorinated hydrocarbons, the mixture containing difluoromethane (R32), pentafluoroethane (R125), 2,3,3,3-tetrafluoropropene (R1234yf), 1,1,1,2-tetrafluoroethane (R134a), and carbon dioxide (CO.sub.2) in specific concentrations.