가연성냉매적용 물대물열펌프 성능연구

This study evaluates the performance of R-290, R-290/600a(70/30) and R-32/152a(50/50) for application in a water to water heat pump, which lends itself to be used with flammable fluids because of the refrigerant location outside of the conditioned space and a small refrigerant charge required. The laboratory tests were performed in a breadboard apparatus. Tests with a liquid-line/suction-line heat exchanger were included in the cooling mode and heating modes. Laboratary tests showed R-32/152a(50/50) to be the best fluid in the water-to-water system. Propane had a second COP and R-290/600a(70/30) the lowest. All three fluids had a lower COP than R-22 in a water-to-water heat pump; however, some COP improvement is possible, particularly for R-32/152a and R-290/600a, if a larger evaporator and condenser are applied.