Thermal Performance of Ground Source Heat Pump Using Steel Pipe Pile for House

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  • TAKEDA Tetsuaki
    Graduate Faculty of Interdisciplinary Research, Research Faculty of Engineering, Department of Mechanical Engineering, University of Yamanashi, University of Yamanashi
  • YODA Osamu
    Fujishima Co, Ltd.
  • WATANABE Hiromi
    Fujishima Co, Ltd.

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Other Title
  • 住宅用鋼管杭を用いた地中熱ヒートポンプの空調性能
  • ジュウタクヨウ コウカン クイ オ モチイタ チチュウ ネツ ヒートポンプ ノ クウチョウ セイノウ

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<p> The objective of this study is to evaluate the performance of a GSHP that uses the direct expansion method, in cooling and heating air conditioning applications. This pump utilizes the steel pipe foundation pile of the house to accommodate its heat exchanger. To achieve the same, 12 underground heat exchangers were inserted into the foundation piles. Experiments were conducted to study its performance in both cooling and heating operations, and the coefficient of performance (COP) was obtained by measuring the amount of heat transferred and the electricity consumption for running the GSHP. From the experimental result obtained, the COP was approximately from 4.4 to 4.7 in the cooling operation and approximately from 4.8 to 5.0 in the heating operation. Additionally, no performance deterioration was observed in the intermittent cooling or heating operation for 5 days. On the other hands, the COP value for continuous cooling and heating operations slightly decreased of 12 % for cooling and 6 % for heating during 5 days.</p>

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