Abstract
Abstract In this study, the optimization and performance characteristics of a cascade heat pump system wasanalyzed with the variation of low stage refrigerant charge amount. The cascade heat pump wasdesigned and constructed with R134a and R410A as the refrigerant for high stage and low stage cycle,respectively. Experiments were conducted by varying the low stage charge amount and the performancecharacteristics of the cascade heat pump were studied. The refrigerant charge amount of the low stagecycle was varied between the ranges of -15% and +10% of the optimum charge amount. Theperformance variation experienced in the cascade heat pump due to the variation of refrigerant chargeamount shows greater effect in the undercharge regions than the overcharge regions. COP reduction inthe undercharge region is larger than the decrease in the overcharge region. Some cycle variation suchas power consumption and cycle pressure according to low stage refrigerant charge amount showeddifferent trends comparing with those according to high stage refrrgerant charge amount. Therefore, theoptimum charge amount of the cascade heat pump should be determined based on the experimentaldata obtained by the variation of high and low stage refrigerant charge amount. Keywords: Cascade heat pump (캐스케이드 열펌프 ), Charge amount(충전량 ), COP(성적계수 )
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