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This paper describes an experimental study for heating performance that can be used in R-134a automobile heatpump systems. The heat pump system is widely studied for heating system in zero-emission vehicles to attain both the small power consumption and the effective heating of the cabin. This paper presents the experimental results of the influenceon heating capacity and coefficient of performance of heat pump system. Tests were performed with different sizes of internaland external heat exchangers, and refrigerant flow rate was also considered in two-way flow devices. In addition, the heat,air, and water sources with the heat pump system were examined. The experimental results with the heat pump systemwere used to analyze the impact on performances. The best combination of performance was A-inside heat exchanger, B-outsideheat exchanger, and B-flow device, respectively. In addition, a water heat-source was found to give roughly 40% of betterperformance than an air heat-source heat pump system.

Experimental Study on the Heating Performance Improvement of R134a Heat Pump System for Zero Emission Vehicles