| abstract |
Disclosed are refrigerants, and heat transfer compositions, heat transfer systems and heat transfer methods containing such refrigeratns, wherein the refrigerant comprises at least about 97% by weight of the following three components (a) - (c) and the following fourth compontent if present: (a) trans-1 -chloro-3,3,3-trifluoropropene (HFCO-1233zd(E)), (b) trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)), (c) trifluoroiodomethane (CF3I), and. (d) 1,1,1,2,3,3, 3-heptafluoropropane (HFC-227ea). |