HEAT TRANSFER COMPOSITIONS

摘要

A composition comprising: (i) a first compound comprising R-1243zf, (3,3,3 trifluoropropene) or a difluoropropene (R-1252) selected from R-1252zf, R-1252yf, R- 1252ye R-1252ze and R-1252zc, and mixtures thereof; (ii) a second compound selected from R-1225ye(E), R-1225 ye(Z) (both 1,2,3,3,3 pentafluoropropene), R-152a (1,1, difluoroethane), R-134a (1,1,1,2 tetrafluoroethane), R-227ea (1,1,1,2,3,3,3 heptafluoropropane) and R-125 (pentafluoroethane), and mixtures thereof; and (iii) a third compound selected from R-1270 (propylene), R-32 (difluoromethane), R-161 (fluoroethane) and R-1234yf (2,3,3,3 tetrafluoropropene), carbon dioxide (CO2) and mixtures thereof.