Working medium and heat cycle system
To provide a working medium for heat cycle which has less influence over the ozone layer, which has less influence over global warming and which provides a heat cycle system excellent in the cycle performance (the efficiency and the capacity), and a heat cycle system excellent in the cycle performance (the efficiency and the capacity). A working medium for heat cycle comprising 1,2-difluoroethylene is employed for a heat cycle system (such as a Rankine cycle system, a heat pump cycle system, a refrigerating cycle system 10 or a heat transport system).
1. A working medium for heat cycle, comprising (Z)-1,2-difluoroethylene and at least one compound selected from the group consisting of a hydrochlorofluoroolefin and a chlorofluoroolefin.
2. The working medium of claim 1 , further comprising at least one hydrocarbon.
3. The working medium of claim 2 , comprising from 1 to 30 mass %, based on the mass of the working medium, of the at least one hydrocarbon.
4. The working medium of claim 2 , wherein the at least one hydrocarbon is selected from the group consisting of propane, propylene, cyclopropane, butane, isobutane, pentane and isopentane.
5. The working medium of claim 1 , comprising at least 60 mass %, based on the mass of the working medium, of the (Z)-1,2-difluoroethylene.
6. The working medium of claim 1 , wherein a total content of the hydrochlorofluoroolefin and the chlorofluoroolefin is from 1 to 60 mass % in the working medium.
7. The working medium of claim 1 , comprising a hydrochlorofluoroolefin selected from the group consisting of 1-chloro-2,3,3,3-tetrafluoropropene (HCFO-1224yd) and 1-chloro-1,2-difluoroethylene (HCFO-1122).
8. The working medium of claim 1 , comprising a chlorofluoroolefin selected from the group consisting of 1,1-dichloro-2,3,3,3-tetrafluoropropene (CFO-1214ya) and 1,2-dichloro-1,2-difluoroethylene (CFO-1112).
9. The working medium of claim 1 , further comprising from 1 to less than 40 mass %, based on the mass of the working medium, of at least one hydrofluorocarbon.
10. A heat cycle system, comprising the working medium according to claim 1 , an evaporator, a compressor, a condenser, an expansion valve, and a load fluid.