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With the limited production and use of R245fa, environmentally friendly refrigerant has attracted the attention of researchers. Due to the similar thermal characteristics, R1233zd(E) is considered to be an ideal substitute for R245fa in heat pump systems. In this study, the performance and economic analysis of heat pump systems with R245fa and R1233zd(E) as refrigerants are carried out. The results show that the total cost of R1233zd(E) system is more than 10% higher than that of R245fa system under the same heating load. With the increase of condensation temperature, the heating capacity of both systems decreases, and with the increase of evaporation temperature, the heating capacity increases. The variation trend of coefficient of performance (COP) of the two systems is similar to that of heating capacity. Under the same operating conditions, the COP of R1233zd(E) system is 19.2% higher than that of R245fa system, and the volumetric heat capacity of R1233zd(E) is 9.0%–13.9% lower than that of R245fa. The economic analysis results show that the investment cost of R1233zd(E) system is low under the same heat load.

Experimental Analyses of Moderately High-Temperature Heat Pump Systems with R245fa and R1233zd(E)