Field Experiment on Heat Extraction or Injection from the Ground Affected by Ground Water Flow

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  • 地下水流れを有する砂槽内採放熱実証実験
  • チカスイ ナガレ オ ユウスル サソウナイ サイホウネツ ジッショウ ジッケン

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Abstract

A steel tank which is 2.0m by 4.5m by 3.0m is installed under the ground in order to investigate increase of heat extraction or heat injection by ground water flow in the ground thermal energy system (GTES). First, the authors define unit heat transfer rate, which can clarify relative merit of heat extraction or injection performance. Next, it was confirmed that the unit heat extraction rate increases according to the ground water velocity even in the case where the ground water velocity is relatively small (100〜350m/year). When the ground water velocity is 1400m/year, unit heat transfer rate with a double pipe ground heat exchanger is 16.12W/m/K and more than three times larger than the one with a single U-tube ground heat exchanger. The result shows that using a ground heat exchanger with small internal thermal resistance is effective to increase the heat extraction from the ground. In addition, from the result that the unit heat transfer rate of measuring was larger than the one calculated with considering only forced convection, it was indicated that the free convection is generated in the sand layer. Thus the authors investigated about the effect of the mixed convection.

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