| 摘要 |
A heat transfer composition comprising 1,2,3,3,3-pentafluoropropene (R-1225ye), 1,1,1,2- tetrafluoroethane (R-134a) and from about 3 to about 25 % by weight carbon dioxide (CO2, R-744). Also provided is a composition comprising R-1225ye, carbon dioxide and1,3,3,3-tetrafluoropropene (R-1234ze). Further provided is a composition comprising from about 6 to about 28 % by weight carbon dioxide and from about 72 to about 96 % by weight R-1225ye. The composition preferably has a low GWP and may further comprise a lubricant, a stabiliser or a flame retardant. The composition may be a refrigerant, a blowing agent, a foam or a sprayable composition. The composition may be used in a heat transfer device e.g. automotive air conditioning systems, chiller refrigeration systems. Also shown are methods of cooling, heating, extraction and cleaning using the composition. |
