GWP 150 이하 친환경 혼합 냉매를 적용한 지열원 히트펌프 성능 특성에 대한 실험적 연구

Abstract

Currently, the heat pump is widely used as a device for refrigerant, but it became impossible to use R-410A for heat pump due of Kigali Agreement. So, the need for a new refrigerant to replace R-410A is growing, but as a result of examining the literature, it was found that research on this is insufficient. Therefore, in this study, an experiment was conducted to explore an eco-friendly refrigerant under GWP 150 and apply it to a geothermal source heat pump device. The search for refrigerants found that a refrigerant mixture consisting of Propane, CO2, R-134a, and R-32 proved to be the optimal refrigerant. Experimental results using this mixed refrigerant showed that with an increase in evaporation temperature, the compression ratio decreased, leading to a decrease in the compression work per unit mass. However, an increase in refrigerant mass flow rate resulted in an increase in compressor power consumption. With an increase in condensation temperature, there was a decrease in enthalpy, leading to a tendency for both condensation heat and evaporation capacity to decrease. As the superheat increased, the heat capacity increased due to an increase in refrigerant flow rate. However, there was a tendency for the coefficient of performance (COP) to decrease, attributed to the increase in compressor power consumption resulting from the rise in compression ratio. The selected refrigerant, when compared to R-410A currently used in heat pumps, exhibits lower performance. However, due to its low Global Warming Potential (GWP), it is recommended as an alternative refrigerant for geothermal heat pumps in this study, allowing for compliance with global refrigerant regulations.