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Effects of saturated soil on the lengths of a double U-tube borehole with two independent circuits, a parallel double U-tube borehole and on the power consumption of a GSHP

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  • Kimiaei, S.
  • Salmanzadeh, M.

Abstract

Ground in winter as a heat source can increase the coefficient of performance of the heat pump. However, cost of digging the ground is high. Thermal properties of the soil affect the length of boreholes. The saturated soil of Kerman has a unique potential for establishment of geothermal boreholes. In this paper, the effects of Kerman's saturated soil with freezing and thawing, on lengths of a double U-tube borehole with two independent circuits and a parallel double U-tube borehole have been investigated. Besides, effects of the saturated soil on the power consumption of a solar assisted ground-coupled heat pump system and a conventional ground-coupled heat pump system have been investigated numerically. The results show that the double U-tube borehole with two independent circuits in Kerman's soil comes out 28.6% shorter in length compared with a parallel double U-tube borehole in a conventional soil. Besides, the power consumption of the solar assisted ground-coupled heat pump system in Kerman's soil decreases by 6.1% in comparison with a conventional ground-coupled heat pump in the standard soil. Moreover, it has been shown that the length of the boreholes in the lower thermal conductivity of the soil can be reduced by as much as 35.4%, 40 m.

Suggested Citation

  • Kimiaei, S. & Salmanzadeh, M., 2020. "Effects of saturated soil on the lengths of a double U-tube borehole with two independent circuits, a parallel double U-tube borehole and on the power consumption of a GSHP," Renewable Energy, Elsevier, vol. 145(C), pages 202-214.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:202-214
    DOI: 10.1016/j.renene.2019.04.152
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    Cited by:

    1. Cao, Jingyu & Zheng, Ling & Peng, Jinqing & Wang, Wenjie & Leung, Michael K.H. & Zheng, Zhanying & Hu, Mingke & Wang, Qiliang & Cai, Jingyong & Pei, Gang & Ji, Jie, 2023. "Advances in coupled use of renewable energy sources for performance enhancement of vapour compression heat pump: A systematic review of applications to buildings," Applied Energy, Elsevier, vol. 332(C).
    2. Zhao, Zilong & Lin, Yu-Feng & Stumpf, Andrew & Wang, Xinlei, 2022. "Assessing impacts of groundwater on geothermal heat exchangers: A review of methodology and modeling," Renewable Energy, Elsevier, vol. 190(C), pages 121-147.

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