EXPERIMENTAL STUDY ON HEAT TRANSFER PERFORMANCE OF DIFFERENT TYPES OF BOREHOLE BURIED TUBE HEAT EXCHANGERS

Li Peng; Yang Chao; Duan Xinsheng; Su Pengwei; Li Qi; Ma Rui

doi:10.19912/j.0254-0096.tynxb.2024-0021

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (4) : 74-82. DOI: 10.19912/j.0254-0096.tynxb.2024-0021

EXPERIMENTAL STUDY ON HEAT TRANSFER PERFORMANCE OF DIFFERENT TYPES OF BOREHOLE BURIED TUBE HEAT EXCHANGERS

Li Peng^1,2, Yang Chao^1,2, Duan Xinsheng³, Su Pengwei^1,2, Li Qi^1,2, Ma Rui⁴

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Abstract

In this paper, practical engineering as the background, in situ thermal response and thermal recovery tests were conducted on 120 m single U-shaped and 345 m one-inlet two-outlet borehole heat exchangers, respectively. Then the heat transfer efficiency of borehole heat exchangers with different pipe materials, tube types and burial depths was analyzed. The results show that the pipe material significantly impacted on heat transfer efficiency, and the heat exchange of the inlet steel pipe of the one-inlet and two-outlet heat exchanger accounts for 71.4% of the total heat exchange. Compared to the 120 m single U-shaped borehole heat exchanger, the 345 m one-inlet and two outlet has an average increase of 24% in heat exchange per linear meter under winter heating conditions. Due to the higher initial average ground temperature, the heat transfer per linear meter slightly decreased under summer cooling conditions.

Key words

geothermal energy / ground source heat pump / heat exchanger / thermal response test / thermal recovery test

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Li Peng, Yang Chao, Duan Xinsheng, Su Pengwei, Li Qi, Ma Rui. EXPERIMENTAL STUDY ON HEAT TRANSFER PERFORMANCE OF DIFFERENT TYPES OF BOREHOLE BURIED TUBE HEAT EXCHANGERS[J]. Acta Energiae Solaris Sinica. 2025, 46(4): 74-82 https://doi.org/10.19912/j.0254-0096.tynxb.2024-0021

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