6m採熱管を使った地中熱利用の実験: 浅深度地中熱利用の研究（その2)

摘要

The authors examined possibility of underground thermal energy use by using ground heat exchanger as short as 6m, from the viewpoint of temperature of ground, in study of underground thermal energy use from shallow underground (Part 1).It was found that the results, higher possibility of practicality of 6m ground heat exchanger in many areas including Hokkaido, in the same way as a oonventional ground heat exchanger 100m. In response to this, we carried out a field test by repeating measurement of short time underground thermal quantity and decreasing quantity of heat due to long-term operation. As a result it was confirmed, underground thermal energy use by 6m ground heat exchanger can be available to residential heating and cooling and decreasing quantity of heat after long term operation of 6 months is 51%.%今回行なった短時間測定法の推計によれば、@1,000〜1,800のピッチの採熱管配置で、運転から2か月間程度は6m採熱管も従来の100m採熱管の一般的採熱量とされる33〜45W/mと同程度以上の量の採熱が可能であるが、6か月程度の運転では約半分程度となることが判った。