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A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps

Author

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  • Hang Zou
  • Peng Pei
  • Chen Wang
  • Dingyi Hao

Abstract

Horizontal ground heat exchangers (HGHEs) have advantages such as convenient construction and low cost; however, their application and popularization are restricted owing to traditional linear HGHEs occupying large space and presenting low total heat transfer capacity. Spiral-coil and slinky-coil HGHEs have been proposed, but currently a comprehensive comparison and evaluation for these types of HGHEs are still needed. In this study, a three-dimensional heat transfer model of the three types of HGHEs for ground source heat pumps (GSHPs) was established. Based on the simulation results, the long-term heat transfer performances were investigated, including the temperature field of surrounding energy-storage soils, outlet working fluid temperature, coefficient of performance (COP) of units, and surplus temperature of the energy-storage soils. A new concept named heat transfer capacity per heat-affected area was proposed in this paper. It is found that the spiral-coil HGHEs have the best performances in terms of working-fluid outlet temperature, unit COP, total heat transfer capacity, heat transfer rate heat-affected area. The linear HGHEs shows the best performances in terms of mitigating heat imbalance risk and heat transfer rate per length. The results provide a reliable basis for selection of HGHE types in engineering practice and improvement guide in the future.

Suggested Citation

  • Hang Zou & Peng Pei & Chen Wang & Dingyi Hao, 2021. "A numerical study on heat transfer performances of horizontal ground heat exchangers in ground-source heat pumps," PLOS ONE, Public Library of Science, vol. 16(5), pages 1-19, May.
    • Handle: RePEc:plo:pone00:0250583
    DOI: 10.1371/journal.pone.0250583
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    References listed on IDEAS

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    1. Kunning Yang & Takao Katsura & Shigeyuki Nagasaka & Katsunori Nagano, 2023. "Analyzing the Performance of Double Spiral Tube Ground Heat Exchangers in a Zero-Energy Building Using Measurement Data," Energies, MDPI, vol. 16(19), pages 1-25, October.

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