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A new performance evaluation algorithm for horizontal GCHPs (ground coupled heat pump systems) that considers rainfall infiltration

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  • Go, Gyu-Hyun
  • Lee, Seung-Rae
  • N.V., Nikhil
  • Yoon, Seok

Abstract

This study presents a novel performance evaluation algorithm for horizontal GCHPs (ground coupled heat pump systems) that considers rainfall infiltration. The influence of rainfall infiltration on the thermal characteristics of shallow trenches is examined using infiltration analyses, and then a numerical analysis study is conducted in order to investigate how rainfall infiltration affects the performance of HGHEs (horizontal ground heat exchangers). According to the thermal performance test results in unsaturated ground with a varying thermal conductivity profile, the rainfall infiltration results in a widening fluid temperature gap between the inlet and outlet, and it increases the thermal efficiency compared with that without rainfall. Furthermore, in fully saturated ground, groundwater advection has a positive influence on the performance of the heat exchanger, and the advection effect varies with the local ground conditions such as hydraulic conductivity and void ratios. In the cooling mode, the free convection phenomenon occurs in shallow trenches, and this fluid circulation attenuates the ground temperature increases due to the heat source, which leads to a significantly faster heat steady state. However, noticeable free convection only occurs if the ground has a high permeability coefficient.

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  • Go, Gyu-Hyun & Lee, Seung-Rae & N.V., Nikhil & Yoon, Seok, 2015. "A new performance evaluation algorithm for horizontal GCHPs (ground coupled heat pump systems) that considers rainfall infiltration," Energy, Elsevier, vol. 83(C), pages 766-777.
    • Handle: RePEc:eee:energy:v:83:y:2015:i:c:p:766-777
    DOI: 10.1016/j.energy.2015.02.086
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    7. Dinh, Ba Huu & Kim, Young-Sang & Yoon, Seok, 2022. "Experimental and numerical studies on the performance of horizontal U-type and spiral-coil-type ground heat exchangers considering economic aspects," Renewable Energy, Elsevier, vol. 186(C), pages 505-516.
    8. Shi, Yu & Cui, Qiliang & Song, Xianzhi & Xu, Fuqiang & Song, Guofeng, 2022. "Study on thermal performances of a horizontal ground heat exchanger geothermal system with different configurations and arrangements," Renewable Energy, Elsevier, vol. 193(C), pages 448-463.
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    10. Agrawal, Kamal Kumar & Misra, Rohit & Yadav, Tejpal & Agrawal, Ghanshyam Das & Jamuwa, Doraj Kamal, 2018. "Experimental study to investigate the effect of water impregnation on thermal performance of earth air tunnel heat exchanger for summer cooling in hot and arid climate," Renewable Energy, Elsevier, vol. 120(C), pages 255-265.
    11. Agrawal, Kamal Kumar & Misra, Rohit & Agrawal, Ghanshyam Das, 2020. "Improving the thermal performance of ground air heat exchanger system using sand-bentonite (in dry and wet condition) as backfilling material," Renewable Energy, Elsevier, vol. 146(C), pages 2008-2023.
    12. Go, Gyu-Hyun & Lee, Seung-Rae & Yoon, Seok & Kim, Min-Jun, 2016. "Optimum design of horizontal ground-coupled heat pump systems using spiral-coil-loop heat exchangers," Applied Energy, Elsevier, vol. 162(C), pages 330-345.
    13. Chengbin Zhang & Weibo Yang & Jingjing Yang & Suchen Wu & Yongping Chen, 2017. "Experimental Investigations and Numerical Simulation of Thermal Performance of a Horizontal Slinky-Coil Ground Heat Exchanger," Sustainability, MDPI, vol. 9(8), pages 1-22, August.
    14. Pavel Pauli & Pavel Neuberger & Radomír Adamovský, 2016. "Monitoring and Analysing Changes in Temperature and Energy in the Ground with Installed Horizontal Ground Heat Exchangers," Energies, MDPI, vol. 9(8), pages 1-13, July.
    15. Sofyan, Sarwo Edhy & Hu, Eric & Kotousov, Andrei, 2016. "A new approach to modelling of a horizontal geo-heat exchanger with an internal source term," Applied Energy, Elsevier, vol. 164(C), pages 963-971.
    16. Muhammad Asad & Vincenzo Guida & Alessandro Mauro, 2023. "Experimental and Numerical Analysis of the Efficacy of a Real Downhole Heat Exchanger," Energies, MDPI, vol. 16(19), pages 1-19, September.

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