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Experimental and analytical investigation on pipe sizes for a coaxial borehole heat exchanger

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  • Gordon, David
  • Bolisetti, Tirupati
  • Ting, David S-K.
  • Reitsma, Stanley

Abstract

This paper investigates the use of a vertical coaxial borehole heat exchanger (BHE), focusing on those consisting of standard geothermal piping material, as a component in a ground-source heat pump system. The results of a lab-scale experiment are used to verify the trends exhibited by a recent semi-analytical model, referred to as the composite coaxial (CCx) model, considering short-term behavior when laminar flow is experienced in the annular space of a coaxial heat exchanger. The discussion on pipe sizes is then expanded upon using the suggested model along with a modified design procedure to compare the performances realized by an example heat pump. A comparison is made here between configurations having various nominal inner pipe diameters while maintaining the same outer pipe. The results of the analysis show that increasing the inner pipe diameter, within the verified limit of the composite coaxial model, will reduce the required length of heat exchanger and increase the overall coefficient of performance realized by the heat pump.

Suggested Citation

  • Gordon, David & Bolisetti, Tirupati & Ting, David S-K. & Reitsma, Stanley, 2018. "Experimental and analytical investigation on pipe sizes for a coaxial borehole heat exchanger," Renewable Energy, Elsevier, vol. 115(C), pages 946-953.
    • Handle: RePEc:eee:renene:v:115:y:2018:i:c:p:946-953
    DOI: 10.1016/j.renene.2017.08.088
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    References listed on IDEAS

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    Cited by:

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    4. Liang Zhang & Songhe Geng & Jun Kang & Jiahao Chao & Linchao Yang & Fangping Yan, 2020. "Experimental Study on the Heat Exchange Mechanism in a Simulated Self-Circulation Wellbore," Energies, MDPI, vol. 13(11), pages 1-22, June.
    5. Luo, Yongqaing & Guo, Hongshan & Meggers, Forrest & Zhang, Ling, 2019. "Deep coaxial borehole heat exchanger: Analytical modeling and thermal analysis," Energy, Elsevier, vol. 185(C), pages 1298-1313.
    6. Yildirim, Nurdan & Parmanto, Slamet & Akkurt, Gulden Gokcen, 2019. "Thermodynamic assessment of downhole heat exchangers for geothermal power generation," Renewable Energy, Elsevier, vol. 141(C), pages 1080-1091.
    7. Luka Boban & Dino Miše & Stjepan Herceg & Vladimir Soldo, 2021. "Application and Design Aspects of Ground Heat Exchangers," Energies, MDPI, vol. 14(8), pages 1-31, April.

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