TEST AND VERIFICATION OF THERMAL CONDUCTIVITY OF GROUND SOURCE HEAT PUMP ROCK AND SOIL BASED ON HEATING CABLE

Guan Peng; Shen Zhenqiang; Duan Xinsheng; Jiao Yuyong

doi:10.19912/j.0254-0096.tynxb.2023-1527

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Acta Energiae Solaris Sinica ›› 2025, Vol. 46 ›› Issue (1) : 328-334. DOI: 10.19912/j.0254-0096.tynxb.2023-1527

TEST AND VERIFICATION OF THERMAL CONDUCTIVITY OF GROUND SOURCE HEAT PUMP ROCK AND SOIL BASED ON HEATING CABLE

Guan Peng^1,2, Shen Zhenqiang¹, Duan Xinsheng¹, Jiao Yuyong¹

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Abstract

Ground thermal conductivity has an important influence on the design and operation of Ground Source Heat Pump system. Conventional thermal response test rigs, used to assess the ground thermal conductivity, has complex water and electricity lines which lead to some problems, such as vulnerable to external interference, poor stability and high cost. A kind of ground thermal response tester using heating cable was designed to solve the above problems. Taking a borehole heat exchanger in Hanyang District of Wuhan City as research object, the conventional thermal response test, thermal response and thermal recovery tests using heating cable were carried out respectively, and the measurements of each test were analyzed by the infinite line source model and thermal superposition principle. The results reveal that the thermal recovery test using heating cable has higher accuracy, and the difference of the measured ground thermal conductivity is only 0.14 W/（m·K） comparing with conventional thermal response test. It is concluded that the thermal response and thermal recovery tests using heating cable have the advantages of low cost, simple and easy operation, and can obtain the ground thermal conductivities at different depth.

Key words

ground source heat pumps / thermal conductivity / electric heating / thermal response test / thermal recovery test / line heat source theory

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Guan Peng, Shen Zhenqiang, Duan Xinsheng, Jiao Yuyong. TEST AND VERIFICATION OF THERMAL CONDUCTIVITY OF GROUND SOURCE HEAT PUMP ROCK AND SOIL BASED ON HEATING CABLE[J]. Acta Energiae Solaris Sinica. 2025, 46(1): 328-334 https://doi.org/10.19912/j.0254-0096.tynxb.2023-1527

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