| 摘要 |
A heat pump system utilizing the waste heat of a closed cycle refrigeration means to heat a liquid e.g. water comprises a compressor 18, evaporator 14, condenser 22 and expansion valve 26 wherein the liquid is supplied via the condenser through lines 30, 32 to a liquid reservoir 34 at a flow rate controlled by a valve 50 in the line 32 responsive to means 49 sensing conditions at the discharge of the compressor. In a modification means are provided for sensing the temperature at the top and bottom of the reservoir for controlling operation of the compressor according to predetermined differences in the two temperatures. <IMAGE>
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