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Heat Transfer and Bearing Characteristics of Energy Piles: Review

Author

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  • Jinli Xie

    (College of Civil Engineering and Architecture, Guangxi University, 100 University Road, Nanning 530004, China)

  • Yinghong Qin

    (College of Civil Engineering and Architecture, Guangxi University, 100 University Road, Nanning 530004, China
    School of Civil Engineering and Architecture, Guangxi University for Nationalities, 188 University Road, Nanning 530006, China)

Abstract

Energy piles, combined ground source heat pumps (GSHP) with the traditional pile foundation, have the advantages of high heat transfer efficiency, less space occupation and low cost. This paper summarizes the latest research on the heat transfer and bearing capacity of energy piles. It is found that S-shaped tubes have the largest heat transfer area and the best heat transfer efficiency; that energy piles need to be designed conservatively, such as adjusting the safety coefficient, number and spacing of the piles according to the additional temperature loads; and that unbalanced surface temperature has not been resolved, caused by uneven refrigeration/heating demand in one cycle. A composite energy pile applied to water-rich areas is proposed to overcome the decay of bearing and heat transfer performance. Besides, most of the heat transfer models are borehole-oriented and will fit for energy piles effectively if the models support variable ground temperature boundary conditions.

Suggested Citation

  • Jinli Xie & Yinghong Qin, 2021. "Heat Transfer and Bearing Characteristics of Energy Piles: Review," Energies, MDPI, vol. 14(20), pages 1-15, October.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6483-:d:653070
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    References listed on IDEAS

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