Working fluid for heat cycle
To provide a working fluid for heat cycle, which has less influence over the ozone layer and has less influence over global warming, and which has favorable cycle performance. A working fluid for heat cycle, which contains trifluoroethylene and difluoroethylene, wherein the proportion of the content of difluoroethylene is less than 1.5 mass % based on the working fluid.
1. A working fluid for heat cycle, comprising trifluoroethylene and difluoroethylene, wherein the proportion of the content of trifluoroethylene is at least 8.5 mass % based on the working fluid, and the proportion of the content of difluoroethylene is at least 4 ppm and less than 1.5 mass % based on the working fluid.
2. The working fluid for heat cycle according to claim 1 , wherein difluoroethylene is 1,1-difluoroethylene.
3. The working fluid for heat cycle according to claim 1 , wherein the proportion of the content of difluoroethylene is at most 0.5 mass % based on the working fluid.
4. The working fluid for heat cycle according to claim 1 , wherein the proportion of the content of trifluoroethylene is at least 10 mass % based on the entire amount of the working fluid.
5. The working fluid for heat cycle according to claim 1 , wherein the proportion of the content of trifluoroethylene is at most 70 mass % based on the entire amount of the working fluid.
6. The working fluid for heat cycle according to claim 1 , further comprising difluoromethane and 2,3,3,3-tetrafluoropropene.
7. The working fluid for heat cycle according to claim 1 , further comprising difluoromethane and trans-1,3,3,3-tetrafluoropropene.
8. The working fluid for heat cycle according to claim 1 , which further comprises a hydrofluorocarbon and/or a hydrofluoroolefin.
9. The working fluid for heat cycle according to claim 8 , wherein the hydrofluorocarbon is difluoromethane.
10. The working fluid for heat cycle according to claim 8 , wherein the hydrofluoroolefin is 2,3,3,3-tetrafluoropropene.
11. The working fluid for heat cycle according to claim 8 , wherein the hydrofluoroolefin is trans-1,3,3,3-tetrafluoropropene.