Performance of Ground Source Heat Pump for Hot Water Supply Systems Using Open-type Underground Heat Exchanger

The purpose of this study is to investigate the performance of hot water supply system using ground source heat pump that use direct expansion method. An underground heat exchanger adopted an open-type water well. The underground heat exchanger is 30 m length heat collection tubes inserted into a 40 m depth water well. The structure of the underground heat exchanger consisted of three 6.35 mm copper tubes and one 9.52 mm copper tube connected at the bottom. The refrigerant is used 1.0 kg of R32 and the capacity of the hot water tank is 460 L. The performance of this system is compared with the case of using a closed-type underground heat exchanger. The system coefficient of performance (SCOP) obtained in this experiment is 2.55.