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Abstract

A process and apparatus for a multistage heat pump system. The system includes a compressor which compreses a working medium, a condenser which condenses the working medium, and an evaporator which evaporates the working medium, and has a construction in which at least either one of the condenser or the evaporator includes a plurality of heat exchange chambers, at least either one of the delivery side or the suction side of the compressor including a plurality of ports that are on different pressure levels, the plurality of heat exchange chambers and the plurality of ports being connected to each other. A cascade system is also disclosed, in which two working mediums are used, one for a high-temperature cycle and one for a low-temperature cycle. The cascade heat exchanger can be single or multistage. The above construction allows the temperature of the working medium to vary along with the temperature variations of a heat source fluid. Because of this, it becomes possible to restrain irreversible energy losses, and achieve a marked improvement in performance.

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First Claim