Working fluid for heat cycle, composition for heat cycle system, and heat cycle system
A working fluid for heat cycle, a composition for a heat cycle system containing the working fluid, and a heat cycle system employing the composition are provided. The working fluid has a low global warming potential and can replace R410A. The working fluid contains trifluoroethylene and 2,3,3,3-tetrafluoropropene. The total proportion of trifluoroethylene and 2,3,3,3-tetrafluoropropene based on the entire amount of the working fluid is from 70 to 100 mass %. The proportion of trifluoroethylene based on the total amount of trifluoroethylene and 2,3,3,3-tetrafluoropropene is from 35 to 95 mass %.
1. A working fluid for heat cycle, comprising:
trifluoroethylene and 2,3,3,3-tetrafluoropropene,
wherein a total proportion of trifluoroethylene and 2,3,3,3-tetrafluoropropene based on an entire amount of the working fluid is from 70 to 100 mass %, and a proportion of trifluoroethylene based on a total amount of trifluoroethylene and 2,3,3,3-tetrafluoropropene is from 44.4 to 85 mass %.
2. The working fluid according to claim 1 , wherein a proportion of trifluoroethylene is more than a proportion of 2,3,3,3-tetrafluoropropene.
3. The working fluid according to claim 1 , wherein a proportion of trifluoroethylene is equal to a proportion of 2,3,3,3-tetrafluoropropene.
4. The working fluid according to claim 1 , wherein a proportion of trifluoroethylene is less than a proportion of 2,3,3,3-tetrafluoropropene.
5. The working fluid according to claim 1 , wherein a proportion of trifluoroethylene based on the entire amount of the working fluid is at most 70 mol %.
6. The working fluid according to claim 1 , further comprising:
a saturated hydrofluorocarbon.
7. The working fluid according to claim 6 , wherein the saturated hydrofluorocarbon is at least one selected from the group consisting of difluoromethane, 1,1-difluoroethane, 1,1,1-trifluoroethane, 1,1,2,2-tetrafluoroethane, 1,2-tetrafluoroethane, and pentafluoroethane.
8. The working fluid according to claim 1 , further comprising:
a hydrofluorocarbon comprising a carbon-carbon double bond other than trifluoroethylene and 2,3,3,3-tetrafluoropropene.
9. The working fluid according to claim 8 , wherein the hydrofluorocarbon comprising a carbon-carbon double bond is at least one selected from the group consisting of 1,2-difluoroethylene, 2-fluoropropene, 1,1,2-trifluoropropene, trans-1,2,3,3,3-pentafluoropropene, cis-1,2,3,3,3-pentafluoropropene, trans-1,3,3,3-tetrafluoropropene, cis-1,3,3,3-tetrafluoropropene, and 3,3,3-trifluoropropene.
10. The working fluid according to claim 1 , further comprising:
difluoromethane,
wherein based on a total amount of trifluoroethylene, 2,3,3,3-tetrafluoropropene, and difluoromethane, a proportion of trifluoroethylene is from 30 to 80 mass %, a proportion of 2,3,3,3-tetrafluoropropene is at most 40 mass %, and a proportion of difluoromethane is at most 30 mass %.
11. A composition for a heat cycle system, comprising:
the working fluid according to claim 1 and
a lubricating oil.
12. A heat cycle system, which employs the composition according to claim 10 .
13. The heat cycle system according to claim 11 , which is a refrigerating apparatus, an air-conditioning apparatus, a power generation system, a heat transport apparatus, or a secondary cooling machine.
14. The heat cycle system according to claim 11 , which is a room air-conditioner, a store package air-conditioner, a building package air-conditioner, a plant package air-conditioner, a gas engine heat pump, a train air-conditioning system, an automobile air-conditioning system, a built-in showcase, a separate showcase, an industrial fridge freezer, an ice making machine, or a vending machine.