A working fluid for a heat cycle containing at least 90 mass % of 1,1,2,2- tetrafluoroethyl-2,2,2-trifluoroethyl ether (HFE-347) and a C.sub.1-4 alcohol is provided. A Rankine cycle system, a heat pump cycle system and a refrigeration cycle system using the working fluid for a heat cycle of the present invention is also provided.

 
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