暖地向け地中熱利用システムの熱性能評価

（ヒートポンプシステムの影響）

抄録

A GSHP system with pile heat exchangers in Okinawa Prefecture in 2016. We undertook refurbishment from 2017 to 2018. After renovation, a cooling test was conducted and evaluation was carried out. The examination went on in July. COP was about 4.0, which was improved by about 1.7 compared to the same period last year. Moreover, by increasing the underground heat exchanger, fluctuation of the soil temperature could be reduced. We believe that it will be possible to evaluate the possibility of dissemination in warm regions by further solving the problem.