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Effective Thermal Conductivity and Borehole Thermal Resistance in Selected Borehole Heat Exchangers for the Same Geology

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  • Tomasz Sliwa

    (Laboratory of Geoenergetics, Drilling, Oil and Gas Faculty, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland)

  • Patryk Leśniak

    (Laboratory of Geoenergetics, Drilling, Oil and Gas Faculty, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland)

  • Aneta Sapińska-Śliwa

    (Laboratory of Geoenergetics, Drilling, Oil and Gas Faculty, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Krakow, Poland)

  • Marc A. Rosen

    (Faculty of Engineering and Applied Science, Ontario Tech University, Oshawa, ON L1G 0C5, Canada)

Abstract

Investigating the constructions of borehole heat exchangers with high efficiency (unit heat transfer between the heat carrier and ground) is important. One of the means to improve efficiency is the use of the most efficient construction of the borehole heat exchanger. The paper describes research on borehole heat exchangers’ thermal efficiency, which is mainly characterized by parameters obtained from a thermal response test: effective thermal conductivity and borehole thermal resistivity. The borehole heat exchangers of the Laboratory of Geoenergetics in Poland were studied. Based on thermal response test interpretation and empirical equations, one of which is proprietary, the heat transfer is calculated independent of the duration of the thermal response test. Other conditions for using borehole heat exchangers in downtowns are discussed. The research aims to determine the best borehole heat exchanger design from five basic possibilities studied. A lack of unequivocal statements regarding this matter in the literature was observed. The influence of the interpretation method on the research results is determined. A single U-tube system filled with gravel is shown to be the most advantageous design by a very small margin. The applied interpretation methods, however, confirm the hitherto ambiguity in the selection of the best construction. The maximum heat carrier temperature at the end of thermal response tests was 32 °C for a geological profile mostly made up of clay (low thermal conductivity) and 23 °C for Carpathian flysch (sandstones and shales, with a higher value of conductivity).

Suggested Citation

  • Tomasz Sliwa & Patryk Leśniak & Aneta Sapińska-Śliwa & Marc A. Rosen, 2022. "Effective Thermal Conductivity and Borehole Thermal Resistance in Selected Borehole Heat Exchangers for the Same Geology," Energies, MDPI, vol. 15(3), pages 1-29, February.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:1152-:d:742092
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    References listed on IDEAS

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    1. Koohi-Fayegh, Seama & Rosen, Marc A., 2012. "Examination of thermal interaction of multiple vertical ground heat exchangers," Applied Energy, Elsevier, vol. 97(C), pages 962-969.
    2. Zhang, Changxing & Chen, Ping & Liu, Yufeng & Sun, Shicai & Peng, Donggen, 2015. "An improved evaluation method for thermal performance of borehole heat exchanger," Renewable Energy, Elsevier, vol. 77(C), pages 142-151.
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    Cited by:

    1. Christopher S. Brown & Nigel J. Cassidy & Stuart S. Egan & Dan Griffiths, 2022. "Thermal and Economic Analysis of Heat Exchangers as Part of a Geothermal District Heating Scheme in the Cheshire Basin, UK," Energies, MDPI, vol. 15(6), pages 1-17, March.
    2. Abdelazim Abbas Ahmed & Mohsen Assadi & Adib Kalantar & Tomasz Sliwa & Aneta Sapińska-Śliwa, 2022. "A Critical Review on the Use of Shallow Geothermal Energy Systems for Heating and Cooling Purposes," Energies, MDPI, vol. 15(12), pages 1-22, June.

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