PROPOSAL OF A FLOW RATE CONTROL GSHP SYSTEM WITH A LINING BOREHOLE GROUND HEAT EXCHANGER
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- SUZUKI Yosuke
- 福井大学大学院 工学研究科建築建設工学専攻
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- TERASAKI Hiroaki
- 福井大学 学術研究院工学系部門
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- FUKUHARA Teruyuki
- 広島工業大学 工学部環境土木工学科
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- KUSAMA Masahiro
- 株式会社エコ・プランナー
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- TANIGUCHI Haruki
- 株式会社ホクコン
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- TANAKA Masato
- ミサワ環境技術株式会社
Bibliographic Information
- Other Title
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- ライニング地中熱交換器を用いた流量制御型地中熱ヒートポンプシステムの提案
- ライニング チチュウ ネツコウカンキ オ モチイタ リュウリョウ セイギョガタ チチュウ ネツ ヒートポンプ システム ノ テイアン
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Abstract
<p> This study proposed a flow rate control Ground Source Heat Pump (GSHP) system with a lining borehole ground heat exchanger (LBHE) from the view point of heat storage. To identify basic thermal properties of the LBHE and its surrounding ground, Thermal Response Test (TRT) was conducted. The thermal resistance of the LBHE was 0.025 K/(W/m) from the TRT and 30% lower than the conventional LBHE. In addition, we performed an air heating experiment to examine the effectiveness of the flow rate control. As a results, the water temperature difference between inlet and outlet of the heat exchange plate was about 3℃ and proposed system can work as general GSHP system. Since third day on the experiment, water temperature in the LBHE and its surrounding ground temperatures at 5 p.m. almost recovered to the previous temperature level at 8 a.m. the following morning due to thermal recovering operation. Therefore, it was expected that proposed system enables continuous use of the shallow ground heat. Then, heat exchange rate per unit length of the LBHE was about 50 W/m and about 1.3 times larger than that of double U-tube ground heat exchanger. Consequently, it was found that proposed system can help to save storage energy in the LBHE.</p>
Journal
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- Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research)
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Journal of Japan Society of Civil Engineers, Ser. G (Environmental Research) 75 (7), III_209-III_216, 2019
Japan Society of Civil Engineers