THERMAL RESPONSE TEST STUDY OF HORIZONTAL AND VERTICAL BOREHOLE HEAT EXCHANGERS

Zhang Weibing; Lu Jie; Wu Kai; Yang Xingfu; Li Peng; Duan Xinsheng

doi:10.19912/j.0254-0096.tynxb.2024-1864

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (2) : 654-661. DOI: 10.19912/j.0254-0096.tynxb.2024-1864

THERMAL RESPONSE TEST STUDY OF HORIZONTAL AND VERTICAL BOREHOLE HEAT EXCHANGERS

Zhang Weibing¹, Lu Jie¹, Wu Kai², Yang Xingfu³, Li Peng⁴, Duan Xinsheng³

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Abstract

Based on practical engineering, this paper conducts the thermal response test of horizontal and vertical borehole heat exchangers. Analyzed the thermal properties and heat transfer capacity differences of heat exchangers under different burial methods, as well as economics, are analyzed. The results indicate that the average thermal conductivity of the rock and soil mass within the vertical borehole heat exchanger range is 74.5% higher than that of the horizontal, the average thermal diffusion coefficient is 61.5% higher, and the thermal resistance is 18.9% lower. Under heating conditions, the heat transfer per linear meter of horizontal and vertical borehole heat exchanger is 9.20 and 42.36 W/m, respectively. The horizontal borehole heat exchanger is 78.3% lower than that of vertical. Under cooling conditions, the heat transfer per linear meter of horizontal and vertical borehole heat exchanger is 12.62 and 67.55 W/m, respectively. The horizontal borehole heat exchanger is 81.3% lower than that of vertical. The combination of horizontal and vertical borehole heat exchanger saves 448300 RMB in cost compared to using only vertical borehole heat exchanger.

Key words

geothermal energy / ground source heat pump / heat exchanger / thermal response test / heating and cooling / test study / heat exchange performance

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Zhang Weibing, Lu Jie, Wu Kai, Yang Xingfu, Li Peng, Duan Xinsheng. THERMAL RESPONSE TEST STUDY OF HORIZONTAL AND VERTICAL BOREHOLE HEAT EXCHANGERS[J]. Acta Energiae Solaris Sinica. 2026, 47(2): 654-661 https://doi.org/10.19912/j.0254-0096.tynxb.2024-1864

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