| 講演要旨(和文) | | 地中熱ヒートポンプの熱交換器は一般にボーリング坑内に設置されるが，今回は初期コストの低減化を目指して農業利用を目的とした浅層部に熱交換器を設置する方式の開発・実験を行った．土壌浅層部で上位に放熱管，下位に採熱管（熱交換管）を配する．上位の放熱管からの熱は，作物の根域部を温める，とともに下側にも伝導し，熱交換域にも伝導する．この熱効果は採熱域への熱のフィードバック効果をもたらすものと期待される．このような考えに従って，冬季における農業用ハウス内での実験を行った． |
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| | 講演要旨(英文) | | Heat exchangers of geothermal heat pumps are normally installed in boreholes drilled with high costs. We conducted experiments to develop a method to install a heat exchanger unit for the purpose of agricultural use in a shallow soil aiming to reduce the initial cost. The radiation tubes are placed in a shallow under the surface and the heat exchangers under the more. The heat from the radiation tubes does not only warm the portion of the crop root zone, but also is transmitted to the heat exchange area. This thermal effect is expected to lead to feedback effects of heat. According to this view, the experiment was carried out in a greenhouse in winter. In this report, the progress of the experiment is described. |
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