Provided is a composition containing a refrigerant that has a refrigerating capacity equivalent to that of widely used R404A, and a low GWP. The composition contains a refrigerant that contains difluoromethane (R32), pentafluoroethane (R125), 1,1,1-trifluoroethane (R143a), and 1,1,1,2-tetrafluoroethane (R134a) in specific concentrations.

A refrigerant composition including trifluoroiodomethane, difluoromethane, pentafluoroethane, and at least one of hexafluoroethane or trifluoromethane is disclosed. The composition exhibits a lower global warming potential and improved thermodynamic properties compared to R-410A.

Provided is a refrigerant composition that has a low GWP; is non-flammable or mildly flammable; and has a refrigerating capacity (Cap) and/or coefficient of performance (COP) equivalent to or higher than those of traditional refrigerants, such as R-134a, R-410A, R-123, or R-404A, when used as an alternative refrigerant for these traditional refrigerants. Specifically, provided is a refrigerant composition containing FO-1216 and a hydrofluoroolefin, wherein the hydrofluoroolefin is at least one member of HFO-1234ze and HFO-1243zf.

To provide a composition for a hat cycle system which comprises a working fluid containing 1,1,2-trifluoroethylene, having cycle performance sufficient as an alternative to R410A while suppressing influence over global warming, and a heat cycle system employing the composition.

A composition for a heat cycle system, which comprises a working fluid for heat cycle containing 1,1,2-trifluoroethylene, CF.sub.3I and at least one compound selected from a hydrofluorocarbon, a hydrofluoroolefin other than 1,1,2-trifluoroethylene and a hydrocarbon, and having a temperature glide of at most 7° C., and a heat cycle system employing the composition for a heat cycle system.

A hydrofluoroolefins-containing refrigerant composition is disclosed. The composition includes the following ingredients in part by weight: 50-90 parts of 2,3,3,3-tetrafluoropropene, 5-30 parts of trans-1,3,3,3-tetrafluoropropene, and 5-20 parts of fluoroethane. The composition of this invention has the advantages of low GWP, environmental friendliness, good refrigeration effect and high compatibility with lubricants.

A refrigerant composition comprising carbon dioxide (CO.sub.2; R-744) and from 1 to 32 weight % difluoromethane (R-32) based on the total weight of the composition is described. Also described is the use of the refrigerant composition for providing heating and cooling and a refrigeration, air-conditioning or heat pump system comprising the refrigerant composition.

Provided is a refrigerant composition that has a low GWP; is non-flammable or mildly flammable; and has a refrigerating capacity (Cap) and/or coefficient of performance (COP) equivalent to or higher than those of traditional refrigerants, such as R-134a, R-410A, R-123, or R-404A, when used as an alternative refrigerant for these traditional refrigerants. Specifically, provided is a refrigerant composition containing FO-1216 and a hydrofluoroolefin, wherein the hydrofluoroolefin is at least one member of HFO-1234ze and HFO-1243zf.

A composition comprising: (a) a flammable refrigerant; and (b) at least one organic compound selected from the group consisting of halogenated hydrocarbons individually represented by the following formulas: CF.sub.nW.sub.(4-n), wherein each W is the same or different and represents Cl, Br, or I, and n represents 1 or 2, with the proviso that the case in which n is 2, and all W are Cl, and the case in which n is 2, and all W are Br, are excluded; CF.sub.3CX.sub.3, wherein each X is the same or different and represents F, Cl, Br, or I, with the proviso that the case in which all X are F is excluded; CF.sub.3CF.sub.2CY.sub.3, wherein each Y is the same or different and represents F, Cl, Br, or I, with the proviso that the case in which all Y are F is excluded; and CF.sub.3CF.sub.2CF.sub.2CZ.sub.3, wherein each Z is the same or different and represents F, Cl, Br, or I, with the proviso that the case in which all Z are F is excluded. The composition has reduced flammability and maintains sufficient refrigerating capacity compared with when only the flammable refrigerant is used.

A refrigeration cycle apparatus (10) includes a refrigerant circuit (11) including a compressor (12), a heat source-side heat exchanger (13), an expansion mechanism (14), and a usage-side heat exchanger (15). In the refrigerant circuit (11), a refrigerant containing at least 1,2-difluoroethylene (HFO-1132 (E)) is sealed. At least during a predetermined operation, in at least one of the heat source-side heat exchanger (13) and the usage-side heat exchanger (15), a flow of the refrigerant and a flow of a heating medium that exchanges heating with the refrigerant are counter flows.

In an air conditioner that uses a refrigerant mixture containing at least 1,2-difluoroethylene, high efficiency is achieved. The motor rotation rate of a compressor (100) can be changed in accordance with an air conditioning load, and thus a high annual performance factor (APF) can be achieved. In addition, an electrolytic capacitor is not required on an output side of a rectifier circuit (21), and thus an increase in the size and cost of the circuit is suppressed.