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Study on the influence of pipe spacing on the annual performance of ground source heat pumps considering the factors of heat and moisture transfer, seepage and freezing

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  • Zhang, Hongzhi
  • Han, Zongwei
  • Li, Gui
  • Ji, Mingzhen
  • Cheng, Xinlu
  • Li, Xiuming
  • Yang, Lingyan

Abstract

Considering heat and moisture transfer, seepage and freezing simultaneously, a three-dimensional dynamic simulation platform of the ground source heat pump system (GSHPS) is established. Based on this platform, the annual performance of the GSHPS is analyzed. The results show that with the increase of pipe spacing, the soil moisture transfer radius, freezing time and freezing distance become smaller, and the unit performance becomes better. Compared with the pipe spacing of 3.5 m, when the pipe spacing is 4.5 m and 5.5 m, the moisture transfer radius decreases by 11.6% and 20.9% in summer and 6.7% and 15.6% in winter, the freezing time decreases by 25 days and 45 days, the maximum freezing distance decreases by 28.6% and 63.3% in unsaturated soil and 31.7% and 63.4% in saturated soil, and the unit average coefficient of performance (COP) increases by 0.7% and 1.9% in cooling period and 5.2% and 12.1% in heating period, respectively. The moisture transfer radius and freezing distance around the central borehole are the largest, and those around the boundary intersection borehole are the smallest. Compared with all other possible working conditions in heating period, the system performance is the best when considering heat and moisture transfer, seepage and freezing simultaneously.

Suggested Citation

  • Zhang, Hongzhi & Han, Zongwei & Li, Gui & Ji, Mingzhen & Cheng, Xinlu & Li, Xiuming & Yang, Lingyan, 2021. "Study on the influence of pipe spacing on the annual performance of ground source heat pumps considering the factors of heat and moisture transfer, seepage and freezing," Renewable Energy, Elsevier, vol. 163(C), pages 262-275.
    • Handle: RePEc:eee:renene:v:163:y:2021:i:c:p:262-275
    DOI: 10.1016/j.renene.2020.08.149
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    References listed on IDEAS

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    1. Choi, Jung Chan & Park, Joonsang & Lee, Seung Rae, 2013. "Numerical evaluation of the effects of groundwater flow on borehole heat exchanger arrays," Renewable Energy, Elsevier, vol. 52(C), pages 230-240.
    2. Eslami-nejad, Parham & Bernier, Michel, 2012. "Freezing of geothermal borehole surroundings: A numerical and experimental assessment with applications," Applied Energy, Elsevier, vol. 98(C), pages 333-345.
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    Cited by:

    1. 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.
    2. Wu, Wei & Zhai, Chong & Sui, Zengguang & Sui, Yunren & Luo, Xianglong, 2021. "Proton exchange membrane fuel cell integrated with microchannel membrane-based absorption cooling for hydrogen vehicles," Renewable Energy, Elsevier, vol. 178(C), pages 560-573.
    3. Jia, Linrui & Lu, Lin & Chen, Jianheng & Han, Jie, 2022. "A novel radiative sky cooling-assisted ground-coupled heat exchanger system to improve thermal and energy efficiency for buildings in hot and humid regions," Applied Energy, Elsevier, vol. 322(C).
    4. Jiaqi Cao & Shiyu Zhou & Tao Wang & Baoqi Shan & Xueping Liu, 2023. "Research on a Variable Water Supply Temperature Strategy for a Ground-Source Heat Pump System Based on TRNSYS-GENOPT (TRNOPT) Optimization," Sustainability, MDPI, vol. 15(5), pages 1-14, March.
    5. Zhang, Xueping & Han, Zongwei & Ji, Qiang & Zhang, Hongzhi & Li, Xiuming, 2021. "Thermal response tests for the identification of soil thermal parameters: A review," Renewable Energy, Elsevier, vol. 173(C), pages 1123-1135.
    6. Li, Siyuan & Sun, Tiemeng & Du, Yufang & Li, Min, 2022. "Influence of moisture on heat transfer of ground heat exchangers in unsaturated soils," Renewable Energy, Elsevier, vol. 193(C), pages 1177-1185.

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