HEAT TRANSFER CHARACTERISTICS OF GROUP-BOREHOLE DOUBLE U-SHAPED GROUND HEAT EXCHANGERS UNDER SEEPAGE CONDITIONS

Hu Wanrui; Tian Chengfu; Liu Heng; Li Peng; Guan Peng; Duan Xinsheng

doi:10.19912/j.0254-0096.tynxb.2025-0776

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (9) : 20-27. DOI: 10.19912/j.0254-0096.tynxb.2025-0776

HEAT TRANSFER CHARACTERISTICS OF GROUP-BOREHOLE DOUBLE U-SHAPED GROUND HEAT EXCHANGERS UNDER SEEPAGE CONDITIONS

Hu Wanrui¹, Tian Chengfu², Liu Heng¹, Li Peng³, Guan Peng⁴, Duan Xinsheng⁴

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Abstract

This study employs numerical simulation to establish a heat transfer model for a group of double U-shaped borehole heat exchangers （BHEs）, incorporating the influence of groundwater seepage. The evolution patterns of the seepage field and ground temperature field are analyzed, along with a sensitivity assessment of key seepage-related factors affecting heat transfer performance. The results reveal that in the absence of groundwater seepage, thermal interference between adjacent BHEs leads to significant cold accumulation in the central region, impairing heat transfer efficiency. However, the presence of seepage substantially mitigates cold accumulation. Along the direction perpendicular to seepage flow, thermal interference between BHEs is negligible, with heat transfer influence oscutting only from upstream to downstram alony the seepage direction. Sensitivity analysis indicates that the thickness of the seepage layer has the most pronounced impact on BHE heat transfer efficiency, followed by seepage velocity, while the seepage direction exhibits the weakest influence.

Key words

geothermal energy / ground source heat pumps / heat exchangers / groundwater seepage / heat transfer characteristics

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Hu Wanrui, Tian Chengfu, Liu Heng, Li Peng, Guan Peng, Duan Xinsheng. HEAT TRANSFER CHARACTERISTICS OF GROUP-BOREHOLE DOUBLE U-SHAPED GROUND HEAT EXCHANGERS UNDER SEEPAGE CONDITIONS[J]. Acta Energiae Solaris Sinica. 2026, 47(9): 20-27 https://doi.org/10.19912/j.0254-0096.tynxb.2025-0776

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