INFLUENCE OF SOIL WATER RETENTION CHARACTERISTICS ON HEAT TRANSFER PERFORMANCE OF HORIZONTAL BURIED PIPES

Zou Hang; Pei Peng; Hao Dingyi; Wang Chen

doi:10.19912/j.0254-0096.tynxb.2020-0905

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Acta Energiae Solaris Sinica ›› 2022, Vol. 43 ›› Issue (5) : 10-20. DOI: 10.19912/j.0254-0096.tynxb.2020-0905

INFLUENCE OF SOIL WATER RETENTION CHARACTERISTICS ON HEAT TRANSFER PERFORMANCE OF HORIZONTAL BURIED PIPES

Zou Hang¹, Pei Peng¹, Hao Dingyi², Wang Chen¹

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Abstract

Based on the capillary water retention curve of the soil, this paper used the numerical modeling approach to investigate the influence of variation of water table on the heat exchange performance of horizontal pipes, heat imbalance risks of the energy storage soils and the techno-economic of heat pump. A new concept named “heat exchange per thermal impacted area” was proposed in this paper. The study results demonstrate that, as the water table depth reduces, and the soil water content increases from 12% to 100%, in the cooling mode, the heat transfer per meter of the horizontal pipe increases by 30%, the outlet water temperature decreases by 23%, and the heat exchange per thermal impacted area increased by 47%; in the heating mode, the heat transfer per meter of the horizontal pipe increases by 24%, the outlet water temperature ratio increases by 25%, and the heat exchange per thermal impacted area increases by 39%. The influence of variation in water table and water soil content is very obvious. Also, the difference of heat imbalance risk in soils under different water retention curves are discussed.

Key words

groundwater / soil moisture / ground source heat pumps / soil water characteristic curve / heat imbalance

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Zou Hang, Pei Peng, Hao Dingyi, Wang Chen. INFLUENCE OF SOIL WATER RETENTION CHARACTERISTICS ON HEAT TRANSFER PERFORMANCE OF HORIZONTAL BURIED PIPES[J]. Acta Energiae Solaris Sinica. 2022, 43(5): 10-20 https://doi.org/10.19912/j.0254-0096.tynxb.2020-0905

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