가정용 지열원 열펌프 시스템의 냉난방 성능 특성 연구

Abstract

Abstract Ground Source Heat Pump (GSHP) systems utilize geothermal energy as a thermal source or sink, for heating,cooling and domestic hot water. It is well known that GSHP is environmentally friendly, and saves energy dramatically.For this reason, many investigative researches have been conducted on commercial and governmental buildings. However,studies on residential GSHP are few, because of the small capacity and cost. In this study, we experimented with thecharacteristic performance of heating, cooling and seasonal performance factor for a residential GSHP system, which consistedof two 180 m deep u-tube ground heat exchangers, a heat pump and measurement instruments. The installed capacityof the heat pump was 5RT, and the conditioning area was 62.23 m 2 . From the experimental results, the cooling COPof the heat pump was 4.13, and the system COP was 3.51, while the CSPF was 3.32. On the other hand, the heatingCOP of the heat pump was 3.87, and the system COP was 3.39, while the HSPF was 3.39. Also, in-situ cooling COP and capacity were 93.7% and 96.4% compared with the EWT certification data, respectively, and that of heating were98.3% and 95.7%, respectively.