Working medium and heat cycle system

• US 9,790,412 B2
• Filed: 11/19/2013
• Issued: 10/17/2017
• Est. Priority Date: 05/19/2011
• Status: Active Grant

• Current Assignee: AGC, Inc.
• Original Assignee: Asahi Glass Company, Limited (AGC, Inc.)
• Inventors: Fukushima, Masato
• Primary Examiner(s): HARDEE, JOHN R
• Application Number:
  US14/084,066
• Publication Number:
  US 20140077123A1
• Time in Patent Office: 1,428 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 comprising at least 60 mass %, based on the mass of the working medium, of (Z)-1,2-difluoroethylene, from 1 to less than 40 mass %, based on the mass of the working medium, of at least one hydrofluorocarbon selected from the group consisting of difluoromethane and pentafluoroethane, and from 1 to less than 40 mass %, based on the mass of the working medium, of a hydrochlorofluoroolefin and/or a chlorofluoroolefin.

2. The working medium according to claim 1, further comprising a hydrocarbon.

3. The working medium according to claim 2, comprising the hydrocarbon in a content of from 1 to 30 mass %, based on the mass of the working medium.

4. The working medium according to claim 2, wherein the hydrocarbon is at least one selected from the group consisting of propane, propylene, cyclopropane, butane, isobutane, pentane and isopentane.

5. The working medium according to 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).

6. The working medium according to 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).

7. The working medium according to claim 1, comprising difluoromethane.

8. The working medium according to claim 1, comprising pentafluoroethane.

9. The working medium according to 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).

10. The working medium according to 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).

11. 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.

12. A working medium comprising (Z)-1,2-difluoroethylene, at least one hydrofluorocarbon selected from the group consisting of difluoromethane and pentafluoroethane, and a hydrochlorofluoroolefin and/or a chlorofluoroolefin.

13. The working medium according to claim 12, comprising the (Z)-1,2-difluoroethylene in a content of at least 60 mass %, based on the mass of the working medium.

14. The working medium according to claim 12, wherein a total content of the hydrochlorofluoroolefin and the chlorofluoroolefin is from 1 to 60 mass % in the working medium.