| 摘要 |
PROBLEM TO BE SOLVED: To provide a working medium for a heat cycle, in which the working medium can be substituted for R410A, and has a low global warming potential and high durability, and to provide a composition for a heat cycle system, containing the above working medium, and a heat cycle system using the above composition.SOLUTION: A working medium for a heat cycle contains trifluoroethylene, 2,3,3,3-tetrafluoropropene, and difluoromethane, in which the ratio of the total amount of the trifluoroethylene, 2,3,3,3-tetrafluoropropene and difluoromethane to the overall quantity of the working medium is greater than 90 mass% and 100 mass% or less; and the ratio of the trifluoroethylene to the total amount of the trifluoroethylene, 2,3,3,3-tetrafluoropropene and difluoromethane is 10 mass% or more and less than 70 mass %, the ratio of the 2,3,3,3-tetrafluoropropene to the total amount of the trifluoroethylene, 2,3,3,3-tetrafluoropropene and difluoromethane is 50 mass% or less, and the ratio of the difluoromethane to the total amount of the trifluoroethylene, 2,3,3,3-tetrafluoropropene and difluoromethane is greater than 30 mass% and 75 mass% or less.SELECTED DRAWING: Figure 1 |
