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Experimental study of several types of ground heat exchanger using a steel pile foundation

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Listed:
  • Jalaluddin,
  • Miyara, Akio
  • Tsubaki, Koutaro
  • Inoue, Shuntaro
  • Yoshida, Kentaro

Abstract

An experimental study of several types of ground heat exchangers (GHEs) installed in a steel pile foundation, including double-tube, U-tube, and multi-tube GHEs, was carried out at Saga University. Water flows through the heat exchangers and exchanges heat to or from the ground. The performance of GHEs was investigated under actual operation in the cooling mode with flow rates of 2, 4, and 8l/min. Temperatures of the ground and GHE tube wall were measured to find the temperature distributions according to the depth of the ground and depth of the GHE tube wall. The temperatures of the inlet and outlet of circulated water were also measured to calculate the heat exchange rate. The double-tube had the highest heat exchange rate, followed by the multi-tube and U-tube GHEs. For example, the average heat exchange rate of GHEs over 24h of continuous operation with a flow rate of 4l/min was 49.6W/m for the double-tube, 34.8W/m for the multi-tube, and 30.4W/m for the U-tube. An increasing flow rate increased the heat exchange rate of the GHEs. The heat exchange rates increased significantly for flow rate increases from 2 to 4l/min, but only slightly changed from 4 to 8l/min.

Suggested Citation

  • Jalaluddin, & Miyara, Akio & Tsubaki, Koutaro & Inoue, Shuntaro & Yoshida, Kentaro, 2011. "Experimental study of several types of ground heat exchanger using a steel pile foundation," Renewable Energy, Elsevier, vol. 36(2), pages 764-771.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:2:p:764-771
    DOI: 10.1016/j.renene.2010.08.011
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    References listed on IDEAS

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    1. Mustafa Omer, Abdeen, 2008. "Ground-source heat pumps systems and applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 12(2), pages 344-371, February.
    2. Hwang, Yujin & Lee, Jae-Keun & Jeong, Young-Man & Koo, Kyung-Min & Lee, Dong-Hyuk & Kim, In-Kyu & Jin, Sim-Won & Kim, Soo H., 2009. "Cooling performance of a vertical ground-coupled heat pump system installed in a school building," Renewable Energy, Elsevier, vol. 34(3), pages 578-582.
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