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A resistive-capacitive model of pile heat exchangers with an application to thermal response tests interpretation

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  • Maragna, Charles
  • Loveridge, Fleur

Abstract

Pile Heat Exchangers (PHE) are an attractive solution to reduce both costs and greenhouse gas emissions for new buildings. However, most state-or-the-art PHE thermal models overlook the heat capacitance of the pile concrete, which is known to be important in thermal analysis. A semi-analytical (SA) model accounting for the pile concrete inertia is developed and validated against a finite-element code. Analysis shows that accounting for PHE inertia always leads to higher performances compared to purely resistive models. Application of the model to interpretation of thermal response tests data allows estimates to be made of the minimum duration test required to obtain reliable values of ground and concrete conductivities.

Suggested Citation

  • Maragna, Charles & Loveridge, Fleur, 2019. "A resistive-capacitive model of pile heat exchangers with an application to thermal response tests interpretation," Renewable Energy, Elsevier, vol. 138(C), pages 891-910.
    • Handle: RePEc:eee:renene:v:138:y:2019:i:c:p:891-910
    DOI: 10.1016/j.renene.2019.02.012
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    References listed on IDEAS

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    Cited by:

    1. Li, Min & Zhang, Liwen & Liu, Gang, 2020. "Step-wise algorithm for estimating multi-parameter of the ground and geothermal heat exchangers from thermal response tests," Renewable Energy, Elsevier, vol. 150(C), pages 435-442.
    2. Meibodi, Saleh S. & Loveridge, Fleur, 2022. "The future role of energy geostructures in fifth generation district heating and cooling networks," Energy, Elsevier, vol. 240(C).
    3. Faizal, Mohammed & Bouazza, Abdelmalek & McCartney, John S., 2022. "Thermal resistance analysis of an energy pile and adjacent soil using radial temperature gradients," Renewable Energy, Elsevier, vol. 190(C), pages 1066-1077.
    4. Charles Maragna & Fleur Loveridge, 2021. "A New Approach for Characterizing Pile Heat Exchangers Using Thermal Response Tests," Energies, MDPI, vol. 14(12), pages 1-18, June.

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