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A practical method for computing the thermal properties of a Ground Heat Exchanger

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  • Christodoulides, Paul
  • Florides, Georgios
  • Pouloupatis, Panayiotis

Abstract

The aim of this paper is to show a practical way of estimating the thermal ground properties, namely the ground thermal conductivity, and in particular the thermal diffusivity and the volumetric heat capacity in a reliable manner, for sizing Ground Heat Exchangers (GHEs). A well-known thermal model, proposed by Blackwell in 1954, is applied and is validated both in the heating mode and in the cooling mode, using a GHE as a probe. The value of the thermal conductivity can be easily determined by the model but the procedure also requires knowledge of the ground specific heat capacity and density, which are normally deduced from the (non-accurate) geological data of the site.

Suggested Citation

  • Christodoulides, Paul & Florides, Georgios & Pouloupatis, Panayiotis, 2016. "A practical method for computing the thermal properties of a Ground Heat Exchanger," Renewable Energy, Elsevier, vol. 94(C), pages 81-89.
    • Handle: RePEc:eee:renene:v:94:y:2016:i:c:p:81-89
    DOI: 10.1016/j.renene.2016.03.035
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    References listed on IDEAS

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    1. Cheng, Wenlong & Ma, Ran & Xie, Kun & Liu, Na & Huang, Yonghua, 2011. "Simultaneous measurement of thermal properties by thermal probe using stochastic approximation method," Applied Energy, Elsevier, vol. 88(5), pages 1834-1840, May.
    2. Goodhew, Steven & Griffiths, Richard, 2004. "Analysis of thermal-probe measurements using an iterative method to give sample conductivity and diffusivity data," Applied Energy, Elsevier, vol. 77(2), pages 205-223, February.
    3. Marcotte, D. & Pasquier, P., 2008. "On the estimation of thermal resistance in borehole thermal conductivity test," Renewable Energy, Elsevier, vol. 33(11), pages 2407-2415.
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    1. Villarino, José Ignacio & Villarino, Alberto & Fernández, Francisco Ángel, 2017. "Experimental and modelling analysis of an office building HVAC system based in a ground-coupled heat pump and radiant floor," Applied Energy, Elsevier, vol. 190(C), pages 1020-1028.
    2. Stylianou, Iosifina Iosif & Florides, Georgios & Tassou, Savvas & Tsiolakis, Efthymios & Christodoulides, Paul, 2017. "Methodology for estimating the ground heat absorption rate of Ground Heat Exchangers," Energy, Elsevier, vol. 127(C), pages 258-270.
    3. Lazaros Aresti & Paul Christodoulides & Gregoris P. Panayiotou & Georgios Florides, 2020. "Residential Buildings’ Foundations as a Ground Heat Exchanger and Comparison among Different Types in a Moderate Climate Country," Energies, MDPI, vol. 13(23), pages 1-22, November.
    4. Paul Christodoulides & Ana Vieira & Stanislav Lenart & João Maranha & Gregor Vidmar & Rumen Popov & Aleksandar Georgiev & Lazaros Aresti & Georgios Florides, 2020. "Reviewing the Modeling Aspects and Practices of Shallow Geothermal Energy Systems," Energies, MDPI, vol. 13(16), pages 1-45, August.

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