Working medium and heat cycle system

• US 10,392,544 B2
• Filed: 09/14/2017
• Issued: 08/27/2019
• Est. Priority Date: 05/19/2011
• Status: Active Grant

• Current Assignee: AGC, Inc.
• Original Assignee: AGC, Inc.
• Inventors: Fukushima, Masato
• Primary Examiner(s): Hardee, John R
• Application Number:
  US15/704,211
• Publication Number:
  US 20180002585A1
• Time in Patent Office: 712 Days
• CPC Class Codes: C09K 2205/12 Hydrocarbons
• CPC Class Codes: C09K 2205/122 Halogenated hydrocarbons
• CPC Class Codes: C09K 2205/126 Unsaturated fluorinated hydrocarbons
• CPC Class Codes: C09K 5/044 comprising halogenated compounds
• CPC Class Codes: C09K 5/045 containing only fluorine as halogen
• CPC Class Codes: F25B 9/002 characterised by the refrigerant

Abstract

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).

Claims

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.