| 主权项 |
1. A method of producing refrigeration, said method comprising evaporating a composition in the vicinity of a body to be cooled and thereafter condensing said composition; wherein said composition consists of:
a. a refrigerant or heat transfer fluid consists of 2,3,3,3-tetrafluoro-1-propene (CH2═CFCF3) or 1,3,3,3-tetrafluoro-1-propene (CHF═CHCF3); and b. at least one perfluoropolyether; and optionally c. a lubricant oil which is mineral oil or synthetic oil selected from the group consisting of alkylbenzene, polyol ester, polyalkylene glycols, polyvinyl ethers, carbonates, polyalphaolefin and combinations thereof; wherein said perfluoropolyether has two end groups; wherein at least one of the end groups of said perfluoropolyether is selected from a group consisting of carboxylic acids and sulfonic acids; and wherein said evaporating and said condensing is in a stationary refrigeration, air-conditioning, heat pump or mobile refrigeration system. |
