Abstract
The Ground Source Heat Pump (GSHP) utilizes a stable heat source existing in underground shallower than 150m. Because of that, we are making highly efficient driving possible throughout the year regardless of climate. Other features of GSHP need high initial cost, but the running cost is low. The direct expansion method GSHP used in this study directly exchanges heat with the underground heat via the copper pipe filled with the refrigerant using the underground heat exchanger. For the reason, it can operate with higher efficiency than indirect system GSHP which has already been put into practical use. In the previous experiments, the performance was evaluated by using one borehole. However, in order to cope with the increase in output of the outdoor unit, two boreholes were used, and the heat exchange performance in the case of installing the underground heat exchanger in parallel examined. COP was used to evaluate heat exchange performance. The average value of COP was about 3.1.The main reason for the low COP value think that the refrigerant piping length of the borehole and outdoor unit is long.
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