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Study on the Influence of Borehole Heat Capacity on Deep Coaxial Borehole Heat Exchanger

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  • Changlong Wang

    (Department of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Han Fang

    (Department of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Xin Wang

    (Department of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Jinli Lu

    (Department of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

  • Yanhong Sun

    (Department of Civil Engineering and Architecture, Anhui University of Technology, Ma’anshan 243002, China)

Abstract

Based on a semi-analytical model established previously for heat transfer in coaxial borehole heat exchangers, the influences of the heat capacities of different parts of the borehole (fluid, pipes and grout) on the performance of deep coaxial borehole heat exchanger (DCBHE) are analyzed. The results are as follows: the heat transfer performance of DCBHE will be underestimated if the heat capacities of different parts of the borehole are ignored; the influences of the heat capacities of different parts of the borehole on the performance of DCBHE are more obvious in the early stage, and gradually weaken with the increasing of time; among the heat capacities of different parts of the borehole, the influence of the fluid heat capacity on the performance of DCBHE is the greatest, and the influence of the pipe heat capacities is the least. Under the working condition studied in this paper, the results obtained with considering the heat capacities of different parts of the borehole are compared to ones ignoring heat capacities of selected elements. It was found that ignoring the fluid heat capacity led to a 0.29 °C lower estimated outlet fluid temperature after 60 h. Omitting the heat capacities of pipes and grout gave 0.03 °C and 0.13 °C lower outlet fluid temperatures after 60 h, respectively. The larger the borehole radius, the greater the influence of borehole heat capacity. The geothermal gradient has little effect on the influence of borehole heat capacity on the performance of DCBHE. The results show that the heat capacities of different parts of the borehole have important effects on the performance of DCBHE, especially in the early stage and for a large borehole radius.

Suggested Citation

  • Changlong Wang & Han Fang & Xin Wang & Jinli Lu & Yanhong Sun, 2022. "Study on the Influence of Borehole Heat Capacity on Deep Coaxial Borehole Heat Exchanger," Sustainability, MDPI, vol. 14(4), pages 1-11, February.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:4:p:2043-:d:746785
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    References listed on IDEAS

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    1. Beier, Richard A. & Spitler, Jeffrey D., 2016. "Weighted average of inlet and outlet temperatures in borehole heat exchangers," Applied Energy, Elsevier, vol. 174(C), pages 118-129.
    2. Yazhou Zhao & Zhibo Ma & Zhonghe Pang, 2020. "A Fast Simulation Approach to the Thermal Recovery Characteristics of Deep Borehole Heat Exchanger after Heat Extraction," Sustainability, MDPI, vol. 12(5), pages 1-27, March.
    3. Nguyen, A. & Pasquier, P. & Marcotte, D., 2015. "Thermal resistance and capacity model for standing column wells operating under a bleed control," Renewable Energy, Elsevier, vol. 76(C), pages 743-756.
    4. Zanchini, E. & Lazzari, S. & Priarone, A., 2010. "Improving the thermal performance of coaxial borehole heat exchangers," Energy, Elsevier, vol. 35(2), pages 657-666.
    5. Li, Min & Lai, Alvin C.K., 2013. "Analytical model for short-time responses of ground heat exchangers with U-shaped tubes: Model development and validation," Applied Energy, Elsevier, vol. 104(C), pages 510-516.
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    Cited by:

    1. Changlong Wang & Qiang Fu & Wanyu Sun & Jinli Lu & Yanhong Sun & Wanwan Li, 2023. "Estimation of Layered Ground Thermal Properties for Deep Coaxial Ground Heat Exchanger," Sustainability, MDPI, vol. 15(18), pages 1-19, September.
    2. Changlong Wang & Qiang Fu & Han Fang & Jinli Lu, 2022. "Estimation of Ground Thermal Properties of Shallow Coaxial Borehole Heat Exchanger Using an Improved Parameter Estimation Method," Sustainability, MDPI, vol. 14(12), pages 1-12, June.

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