直接膨張方式地中熱ヒートポンプの熱交換性能

－地中熱交換器の放熱特性－

抄録

The ground source heat pump (GSHP) is a system that uses buried pipes to extract heat from the soil and release it to the soil. Underground heat exchangers were set to a length of 25 m and inserted into each of three water-filled bore holes. The purpose of this paper is to evaluate the performance of the GSHP using the direct expansion method in cooling mode. The performance was evaluated by the Coefficient of Performance (COP), which is determined by the ratio of the heat exchange to the power consumption of the compressor. The experimental results showed that the average COP was more than 8.2 in the cooling mode.