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Temperature fields induced by geothermal devices

Author

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  • Ciriello, V.
  • Bottarelli, M.
  • Di Federico, V.
  • Tartakovsky, D.M.

Abstract

Efficient and sustainable exploitation of low-enthalpy geothermal energy relies on accurate representations of heat transfer processes in the subsurface. An analytical model, which provides such a representation by predicting the dynamics of thermal fields induced by shallow GHEs (ground heat exchangers), is derived. The model accounts for atmospheric temperature fluctuations at the ground surface, an arbitrary geometry of GHEs operating in time-varying heating/cooling modes, and anisotropy and uncertain spatio-temporal variability of thermal conductivity of the ambient soil. To validate the model, its predictions of a thermal field generated by a shallow flat-panel GHEs are compared with experimental data. This comparison demonstrates the model's ability to provide accurate fit-free predictions of soil-temperature fields generated by GHEs. The analysis presented shows that a single horizontal GHE may affect soil temperature by several degrees at distances on the order of 1 m. The volume of influence is expressed in terms of soil thermal properties. Such modeling predictions are invaluable for screening of potential sites and optimal design of geothermal systems consisting of multiple GHEs.

Suggested Citation

  • Ciriello, V. & Bottarelli, M. & Di Federico, V. & Tartakovsky, D.M., 2015. "Temperature fields induced by geothermal devices," Energy, Elsevier, vol. 93(P2), pages 1896-1903.
  • Handle: RePEc:eee:energy:v:93:y:2015:i:p2:p:1896-1903
    DOI: 10.1016/j.energy.2015.10.052
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    References listed on IDEAS

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    1. Michele Bottarelli, 2013. "A preliminary testing of a flat panel ground heat exchanger," International Journal of Low-Carbon Technologies, Oxford University Press, vol. 8(2), pages 80-87, January.
    2. Yang, H. & Cui, P. & Fang, Z., 2010. "Vertical-borehole ground-coupled heat pumps: A review of models and systems," Applied Energy, Elsevier, vol. 87(1), pages 16-27, January.
    3. Florides, Georgios & Kalogirou, Soteris, 2007. "Ground heat exchangers—A review of systems, models and applications," Renewable Energy, Elsevier, vol. 32(15), pages 2461-2478.
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    Cited by:

    1. Manuel Cánovas & Iván Alhama & Gonzalo García & Emilio Trigueros & Francisco Alhama, 2017. "Numerical Simulation of Density-Driven Flow and Heat Transport Processes in Porous Media Using the Network Method," Energies, MDPI, vol. 10(9), pages 1-15, September.
    2. Habibi, Mohammad & Amadeh, Ali & Hakkaki-Fard, Ali, 2020. "A numerical study on utilizing horizontal flat-panel ground heat exchangers in ground-coupled heat pumps," Renewable Energy, Elsevier, vol. 147(P1), pages 996-1010.
    3. José Antonio Jiménez-Valera & Gonzalo García-Ros & Iván Alhama, 2021. "Numerical Simulation of Heat Transport Problems in Porous Media Coupled with Water Flow Using the Network Method," Energies, MDPI, vol. 14(18), pages 1-23, September.
    4. Cavazzuti, Marco & Bottarelli, Michele, 2023. "Performance analysis of a multi-source renewable energy system for temperature control in buildings of varied thermal transmittance and climate zone," Renewable and Sustainable Energy Reviews, Elsevier, vol. 187(C).

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