Performance Characteristics of Seawater Heat Pump using R32/R152a Mixed Refrigerant

Abstract

In this study, a 2RT seawater heat pump was designed and constructed. The R32/R152a refrigerant mixture and R134a were used for the seawater heat pump, which originally used R22. A drop-in experiment was performed to experimentally compare the performance of the heat pump system for different refrigerants under the same experimental conditions as those for the original refrigerant. Through this experiment, the characteristics of the cycle performance was compared and analyzed for all the refrigerants. As substitutes for R22, we used R32/R152a mixed in ratios of 35 to 65 and 50 to 50. The heat source flow rate entering the condenser was approximately 24 L/min, and we obtained results at three different temperatures: 20, 30, and 40 °C. For the evaporator, the heat source flow rate was 20 L/min, and the results were obtained at 9, 12, and 15 °C. When R32/R152a mixed in a ratio of 35 to 65 was used, the pressure ratio and discharge gas temperature of the compressor of the seawater heat pump were less than those when R22 was used. At this ratio of R32/R152a, the compressor work and COP were slightly higher than those when R22 was used (by 8% and 10%, respectively).the performance of the heat pump system for different refrigerants under the same experimental conditions as those for the original refrigerant. Through this experiment, the characteristics of the cycle performance was compared and analyzed for all the refrigerants. As substitutes for R22, we used R32/R152a mixed in ratios of 35 to 65 and 50 to 50. The heat source flow rate entering the condenser was approximately 24 L/min, and we obtained results at three different temperatures: 20, 30, and 40 °C. For the evaporator, the heat source flow rate was 20 L/min, and the results were obtained at 9, 12, and 15 °C. When R32/R152a mixed in a ratio of 35 to 65 was used, the pressure ratio and discharge gas temperature of the compressor of the seawater heat pump were less than those when R22 was used. At this ratio of R32/R152a, the compressor work and COP were slightly higher than those when R22 was used (by 8% and 10%, respectively).