RESEARCH ON THERMAL PARAMETER INVERSION METHOD FOR VERTICAL BOREHOLE HEAT EXCHANGER OF GROUND SOURCE HEAT PUMP

Su Hua; Nie Weiwei; Li Qian; Lyu Yuanli; Xie Xin; Huang Junjie

doi:10.19912/j.0254-0096.tynxb.2022-0968

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Acta Energiae Solaris Sinica ›› 2023, Vol. 44 ›› Issue (10) : 481-487. DOI: 10.19912/j.0254-0096.tynxb.2022-0968

RESEARCH ON THERMAL PARAMETER INVERSION METHOD FOR VERTICAL BOREHOLE HEAT EXCHANGER OF GROUND SOURCE HEAT PUMP

Su Hua¹, Nie Weiwei¹, Li Qian¹, Lyu Yuanli¹, Xie Xin², Huang Junjie¹

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Abstract

Based on the line heat resource model, this paper studied four inverting methods for borehole thermal resistance, the soil thermal conductivity and volume specific heat of borehole heat exchanger of the geothermal heat pump system. Inverting computations were conducted based on thermal response test data. Results show that if only using the input and outlet water temperature data of the buried pipe to obtain above three parameters by some optimizing approach, two of them, that is borehole thermal resistance and volumetric specific heat, may deviate from the physical reality. There still exists uncertainty if borehole thermal resistance or volumetric specific heat is supplemented. If the water and borehole wall temperature are used to compute the borehole thermal resistance, and the borehole wall temperature is used to obtain thermal conductivity and volume specific heat in the inversion, result meets the reality better. It is recommended that the inlet and outlet water temperature and borehole wall temperature be recorded at the same time in thermal response test. Three measuring points should be set in the upper, middle and bottom of the buried pipe to record the temperature of the hole wall.

Key words

ground source heat pump / vertical borehole heat exchanger / thermal parameters / inversion

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Su Hua, Nie Weiwei, Li Qian, Lyu Yuanli, Xie Xin, Huang Junjie. RESEARCH ON THERMAL PARAMETER INVERSION METHOD FOR VERTICAL BOREHOLE HEAT EXCHANGER OF GROUND SOURCE HEAT PUMP[J]. Acta Energiae Solaris Sinica. 2023, 44(10): 481-487 https://doi.org/10.19912/j.0254-0096.tynxb.2022-0968

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