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Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers

Author

Listed:
  • Krystian Leski

    (Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland)

  • Przemysław Luty

    (Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland)

  • Monika Gwadera

    (Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland)

  • Barbara Larwa

    (Faculty of Chemical Engineering and Technology, Cracow University of Technology, Warszawska 24, 31-155 Kraków, Poland)

Abstract

In this work, numerical simulation calculations were performed to investigate the minimum ground temperature that occurs when extracting thermal energy in a horizontal ground heat exchanger system in the Central European climate. The influence of ground thermal conductivity, heat flux extracted from the ground, periodic interruptions in the operation of the heat exchanger, periodic supply of heat energy to the ground, relative humidity of the ambient air, evaporation rate coefficient, and convective heat transfer coefficient on the ground minimum temperature were investigated. Based on the simulation, it was found that the high value of ground thermal conductivity favorably affects the operation of the installation with a ground heat exchanger. Both the reduction of the maximum heat flux taken from the ground, as well as periodic interruptions in the operation of the exchanger effectively protects the ground against excessive cooling. Further, it was found that heat supply to the ground in summer only slightly raises its minimum temperature, as well as the decrease of the relative humidity of the ambient air and evaporation rate coefficient. The change of the convective heat transfer coefficient has no significant impact on the minimum annual ground temperature.

Suggested Citation

  • Krystian Leski & Przemysław Luty & Monika Gwadera & Barbara Larwa, 2021. "Numerical Analysis of Minimum Ground Temperature for Heat Extraction in Horizontal Ground Heat Exchangers," Energies, MDPI, vol. 14(17), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:17:p:5487-:d:628035
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    References listed on IDEAS

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    1. Zhang, Linfeng & Zhang, Quan & Huang, Gongsheng, 2016. "A transient quasi-3D entire time scale line source model for the fluid and ground temperature prediction of vertical ground heat exchangers (GHEs)," Applied Energy, Elsevier, vol. 170(C), pages 65-75.
    2. El-Din, M.M.Salah, 1999. "On the heat flow into the ground," Renewable Energy, Elsevier, vol. 18(4), pages 473-490.
    3. Lazzari, Stefano & Priarone, Antonella & Zanchini, Enzo, 2010. "Long-term performance of BHE (borehole heat exchanger) fields with negligible groundwater movement," Energy, Elsevier, vol. 35(12), pages 4966-4974.
    4. Li, Wenxin & Li, Xiangdong & Peng, Yuanling & Wang, Yong & Tu, Jiyuan, 2020. "Experimental and numerical studies on the thermal performance of ground heat exchangers in a layered subsurface with groundwater," Renewable Energy, Elsevier, vol. 147(P1), pages 620-629.
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    Cited by:

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