Honeywell International Inc.
High efficiency air conditioning systems and methods

Abstract:

Disclosed are refrigeration systems having a heat source to be cooled and a heat sink and a capacity of from about 2 to about 30 tons and comprising: (a) a heat transfer composition comprising a refrigerant comprising at least about 80% by weight of trans1-chloro-3,3,3-trifluoropropene (HCFO-1233zd(E)) or at least about 80% by weight of trans1,3,3,3-tetrafluoropropene (HFO-1234ze(E)); (b) a centrifugal compressor having a discharge:suction pressure ratio at least about 2:1; (c) a condenser operating at temperature in the range of from about 10.degree. C. to about 60.degree. C.; (d) and expander for producing relatively cold low pressure refrigerant liquid; (e) a high efficiency evaporator; and (f) at least one heat exchanger fluidly connected between said evaporator and said refrigerant suction of said compressor.