Abstract
The purpose of this study is to investigate the performance of a ground source heat pump using direct expansion method in case of hot water supply system. The underground temperature beneath about 10m maintains almost constant throughout a year. Ground Source Heat Pump (GSHP) utilizes this property. GSHP using direct expansion method has higher performance than GSHP using indirect heat exchanger method. GSHP using direct expansion method can also be reduced the number of parts and initial cost. GSHP using direct expansion method is difficult to evaluate the power of heating in the refrigerant side because the refrigerant becomes two phase flow and it reduces the measurement accuracy of flow rate. Therefore, we tried to evaluate the performance on GSHP using direct expansion method as hot water supply system. We get the amount of heat was evaluated by measuring the temperature difference and flow rate of supplying hot water. We used the closed loop vertical borehole which depth was 30m. Average of COP became 3.1.
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