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Parameter analysis of single U-tube GHE and dynamic simulation of underground temperature field round one year for GSHP

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  • Bi, Yuehong
  • Lyu, Tianli
  • Wang, Hongyan
  • Sun, Ruirui
  • Yu, Meize

Abstract

Based on a quasi 3-D steady model inside and a 2-D unsteady model outside of the borehole of ground heat exchanger(GHE), the relationship between the heat exchange rate per depth of borehole and main parameters (center-to-center distance of two branch pipes, radius and depth of the borehole) has been analyzed. The rational values of those design parameters with considering the heat exchange rate per depth of borehole are obtained. The dynamic simulations of underground temperature field (UTF) of single-pipe and pipe-group of U-tube GHE have been conducted by ANSYS. The change rules of UTF are obtained when ground source heat pump(GSHP) has experienced a complete cooling and heating cycle during one year. The simulation results of a single-pipe show that the action radius of borehole is 1.9 m, i.e., it is reasonable that the borehole center-to-center distance is 3.8 m. The simulation results of pipe-group indicate that temperature of the soil center encircled by four boreholes at the beginning of heating in winter is higher than the initial temperature of soil, but it is in opposite for cooling in summer, which is beneficial to the efficient operation of GSHP. This work can provide guidance for the rational design and operation of GSHP.

Suggested Citation

  • Bi, Yuehong & Lyu, Tianli & Wang, Hongyan & Sun, Ruirui & Yu, Meize, 2019. "Parameter analysis of single U-tube GHE and dynamic simulation of underground temperature field round one year for GSHP," Energy, Elsevier, vol. 174(C), pages 138-147.
    • Handle: RePEc:eee:energy:v:174:y:2019:i:c:p:138-147
    DOI: 10.1016/j.energy.2019.02.160
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    Cited by:

    1. Jianan Liu & Hao Yu & Haoran Ji & Kunpeng Zhao & Chaoxian Lv & Peng Li, 2020. "Optimal Operation Strategy of a Community Integrated Energy System Constrained by the Seasonal Balance of Ground Source Heat Pumps," Sustainability, MDPI, vol. 12(11), pages 1-24, June.
    2. Li, Yufan & Bi, Yuehong & Lin, Yashan & Wang, Hongyan & Sun, Ruirui, 2023. "Analysis of the soil heat balance of a solar-ground source absorption heat pump with the soil-based energy storage in the transition season," Energy, Elsevier, vol. 264(C).

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