WORKING MEDIUM AND HEAT PUMP USING SAID WORKING MEDIUM

PURPOSE:An inexpensive working medium, obtained by incorporating trichlorotrifluoroethane with chlorodifluoromethane in a specific proportion, easily handleable, having improved coefficient of performance, and usable for heat pumps, etc. CONSTITUTION:A working medium obtained by incorporating trichlorotrifluoroethane at >=0.4, preferably 0.45-0.94 molar fraction with chlorodifluoromethane. The above-mentioned working medium is compressed with a compressor 1 of a heat pump, cooled with a load fluid introduced from a tube 3 in a condenser 2 and condensed. The load fluid is heated conversely and fed through a tube 3' for use as load heat. The working medium is then decompressed by a decompressor 4, evaporated under heating in a vaporizer 5 with a heat source fluid passing through tubes 6 and 6' and sucked through the compressor 1 to repeat the above-mentioned cycle.