COMPARATIVE ASSESSMENT OF HEAT PUMP USING REFRIGERANTS R407C, R410A, AND R32 AS WORKING FLUIDS WITH REGARDS TO EXERGY AND EXERGOECONOMIC PERFORMANCE

摘要

In this study, the evaluation of exergy and exergoeconomic analysis of heat pump using R407C, R410A and R32 as working fluids was performed by using actual thermodynamic and cost data. Components of heat pump system (condenser, evaporator, expansion valve and compressor) were handled individually by considering the exergy destruction, exergy loss ratio, exergy efficiency, and exergoeconomic criterion (exergy loss per total capital investment, saved operation cost). The results show that, it is insufficient to evaluate a heat pump system's energy by using thermal efficiency only, exergoeconomic assessment is an important approach that should be used to clearly determine the energy and exergy costs of heat pump system. Condenser temperature has been kept fixed at 60°C and temperature lift has been varied from 45°C to 70°C to carry out the simulation work. Exergetic analysis indicates that most exergy is destructed in the expansion valve and compressor in the heat pump system, it was clearly observed that R32 shows slightly better thermo-economic performances at higher temperature lift. Therefore, R32 has higher exergy efficiency compared to R410A and R407C, which varies in the 59.2-50.64% range and provides significant economic and environmental benefits.