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Analysis of Short Time Period of Operation of Horizontal Ground Heat Exchangers

Author

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  • Salsuwanda Selamat

    (Graduate School of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
    School of Environmental Engineering, Universiti Malaysia Perlis, Kompleks Pusat Pengajian Jejawi 3, Arau 02600, Perlis, Malaysia)

  • Akio Miyara

    (Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
    These authors contributed equally to this work.)

  • Keishi Kariya

    (Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
    These authors contributed equally to this work.)

Abstract

Ground source heat pump (GSHP) systems have been proven to have higher efficiency compared to conventional air source heat pump systems for space heating and cooling applications. While vertical ground heat exchangers (GHE) are favorable in GSHP installation, this type of configuration requires higher capital costs as opposed to horizontal configuration. Numerical simulation has been used to accurately predict the thermal performance of GHE. In this paper, numerical analysis of thermal performance for slinky horizontal GHE loops in different orientations and operation modes is discussed. It was found that the loop orientation is not so important due to the little effect it has on thermal performance. While the mean heat exchange rate of copper loop increases 48% compared to HDPE loop, the analysis supports the common claim that heat exchange rate is predominantly limited by the thermal conductivity of the ground. With the same amount of circulation work, the mean heat exchange rate increases by 83%–162% when operated in parallel loops operations. The performance in these operations can be further optimized to 10%–14% increase when spacing between adjacent loops was provided. The spacing helps to minimize interference of heat flow that would penalize the overall thermal performance.

Suggested Citation

  • Salsuwanda Selamat & Akio Miyara & Keishi Kariya, 2015. "Analysis of Short Time Period of Operation of Horizontal Ground Heat Exchangers," Resources, MDPI, vol. 4(3), pages 1-17, July.
    • Handle: RePEc:gam:jresou:v:4:y:2015:i:3:p:507-523:d:52502
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    References listed on IDEAS

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    1. Tarnawski, V.R. & Leong, W.H. & Momose, T. & Hamada, Y., 2009. "Analysis of ground source heat pumps with horizontal ground heat exchangers for northern Japan," Renewable Energy, Elsevier, vol. 34(1), pages 127-134.
    2. Naili, Nabiha & Hazami, Majdi & Attar, Issam & Farhat, Abdelhamid, 2013. "In-field performance analysis of ground source cooling system with horizontal ground heat exchanger in Tunisia," Energy, Elsevier, vol. 61(C), pages 319-331.
    3. Chong, Chiew Shan Anthony & Gan, Guohui & Verhoef, Anne & Garcia, Raquel Gonzalez & Vidale, Pier Luigi, 2013. "Simulation of thermal performance of horizontal slinky-loop heat exchangers for ground source heat pumps," Applied Energy, Elsevier, vol. 104(C), pages 603-610.
    4. 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.
    5. Pulat, Erhan & Coskun, Salih & Unlu, Kursat & Yamankaradeniz, Nurettin, 2009. "Experimental study of horizontal ground source heat pump performance for mild climate in Turkey," Energy, Elsevier, vol. 34(9), pages 1284-1295.
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