COMPARATIVE ANALYSIS OF THERMODYNAMICS PERFORMANCE OF CASCADE REFRIGERATION SYSTEM FOR REFRIGERANT COUPLE R23/R290 AND R23/R600A

Abstract

This study presents a comparative analysis of thermodynamic performance of cascade refrigeration systems (CRSs) for refrigerant couples R23/R290 and R23/R600A to discover whether R600A is a suitable substitute for R290. The discharge temperature, input power of the compressor, coefficient of performance (COP), exergy loss (X) and exergy efficiency (g) are chosen as the objective functions. The operating parameters considered in this thesis include condensing temperature, evaporating temperature in both high-temperature cycle i.e HTC and lower cycle i.e LTC and Temperature difference in the cascade heat exchanger. Under the same operation condition, the input power of R23/R600A CRS is lower than that of R23/R290 CRS, and COP opt is higher than that of R23/R290 CRS. The theoretical analysis indicates that R23/R600A is a more potential refrigerant couple than R23/R290 in Cascade Refrigeration System (CRS).