HEAT PUMP SYSTEM FOR COOLING AND HEATING OPERATION AND HOT WATER SUPPLY USING BINARY REFRIGERATING CYCLE HAVING CASCADE HEAT EXCHANGER

摘要

PURPOSE: A heat pump system is provided to reduce manufacturing costs and energy consumption, while achieving improved efficiency. CONSTITUTION: A heat pump system comprises a high temperature side compressor(HC) for compressing, into a high temperature high pressure state, the high temperature side gas refrigerant evaporated from a cascade condenser(E3) serving as an evaporator of a high temperature side refrigerating cycle and a condenser of a low temperature side refrigerating cycle; a high temperature side condenser(E1) for condensing the refrigerant gas compressed into the high temperature high pressure state by the high temperature side compressor; a high temperature side supercooler(E2) where the refrigerant cooled by the high temperature side condenser is heat exchanged and supercooled; a high temperature side expansion valve(V1) which performs a throttling operation such that the supercooled refrigerant is easily evaporated; a low temperature side compressor(LC) for compressing the refrigerant gas evaporated from an evaporator and accumulator(E4) into a high temperature high pressure refrigerant gas; and a low temperature side expansion valve(V2) which performs a throttling operation such that the refrigerant condensed by the cascade condenser is easily evaporated.