Abstract: The present invention relates, in part, to heat transfer compositions and methods that include (a) from about 60% to about 70% by weight of HFC-32; (b) from about 20% to about or less than 40% by weight of a compound selected from unsaturated —CF3 terminated propenes, unsaturated —CF3 terminated butenes, and combinations of these; and (c) from greater than about 0% to about 10% by weight of n-butane, isobutane, and combinations thereof.

Abstract: The present invention also includes methods of transferring heat comprising: (a) providing a heat pipe comprising an evaporating section containing a liquid working fluid comprising at least about 60% by weight of cis 1-chloro-3,3,3-trifluoropropene and a condensing section containing a working fluid vapor comprising cis 1-chloro-3,3,3-trifluoropropene; (b) placing said evaporating section in thermal communication with a body, fluid, surface or the like to be cooled; and (c) placing said condensing section in thermal communication with a body, fluid, surface or the like to be heated.

Abstract: The present invention relates, in part, to heat transfer systems, methods and compositions which utilize a heat transfer fluid comprising: (a) HFO-1234ze; (b) HFC-227ea; and (c) optionally HFC-134a, wherein HFO-1234ze and HFC-227ea are provided in effective amounts to form an azeotrope or azeotrope-like composition.

Abstract: The present invention relates, in part, to heat transfer compositions and methods that include (a) from about 60% to about 70% by weight of HFC-32; (b) from about 20% to about or less than 40% by weight of a compound selected from unsaturated-CF3 terminated propenes, unsaturated-CF3 terminated buteness, and combinations of these; and (c) from greater than about 0% to about 10% by weight of n-butane, isobutane, and combinations thereof.