Abstract
This paper describes the performance of GSHP (Ground Source Heat Pump) system that uses the direct expansion method. In the experimental apparatus, a borehole is 30 m in depth and R410A is used as a refrigerant. The ground source heat pump was operated continuously for 48 hours with the cooling mode. Temperature and pressure of the refrigerant were measured at 5 positions. Air temperature at the entrance and exit of an indoor unit were also measured. As a result of the experiment, the coefficient of performance (COP) of the GSHP became 12 when the set value of the room temperature is 27℃.
