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Reduced Scale Experimental Modelling of Distributed Thermal Response Tests for the Estimation of the Ground Thermal Conductivity

Author

Listed:
  • Stefano Morchio

    (Dime Department of Mechanical, Energy, Management and Transportation Engineering, The University of Genova, Via Opera Pia 15, 16145 Genova, Italy)

  • Marco Fossa

    (Dime Department of Mechanical, Energy, Management and Transportation Engineering, The University of Genova, Via Opera Pia 15, 16145 Genova, Italy)

  • Antonella Priarone

    (Dime Department of Mechanical, Energy, Management and Transportation Engineering, The University of Genova, Via Opera Pia 15, 16145 Genova, Italy)

  • Alessia Boccalatte

    (Dime Department of Mechanical, Energy, Management and Transportation Engineering, The University of Genova, Via Opera Pia 15, 16145 Genova, Italy
    Université Savoie Mont Blanc, Polytech Annecy-Chambery, LOCIE UMR CNRS 5271, FédEsol FR CNRS 3344, 60 Avenue du Lac Lèman, 73370 Le Bourget-du-Lac, France)

Abstract

The knowledge of the ground thermal properties, and in particular the ground thermal conductivity is fundamental for the correct sizing of the Ground Coupled Heat Pump (GCHP) plant. The Thermal Response Test (TRT) is the most used experimental technique for estimating the ground thermal conductivity. This paper presents an experimental setup aimed to realise a suitable scale prototype of the real borehole heat exchanger (BHE) and the surrounding ground for reduced scale TRT experiments. The scaled ground volume is realised with a slate block. Numerical analyses were carried out to correctly determine suitable geometric and operational parameters for the present setup. The scaled heat exchanger, inserted into the block, is created with additive technology (3D printer) and equipped with a central electrical heater along its entire depth and with temperature sensors at different radial distances and depths. Present measurements highlight the possibility to reliably perform a TRT experiment and to estimate the slate/ground thermal conductivity with an agreement of about +12% with respect to measurements provided by a standard commercial conductivity meter on proper cylindrical samples of the same material and onto 10 different portions of the slate block.

Suggested Citation

  • Stefano Morchio & Marco Fossa & Antonella Priarone & Alessia Boccalatte, 2021. "Reduced Scale Experimental Modelling of Distributed Thermal Response Tests for the Estimation of the Ground Thermal Conductivity," Energies, MDPI, vol. 14(21), pages 1-15, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:6955-:d:662501
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    References listed on IDEAS

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    1. Spitler, Jeffrey D. & Gehlin, Signhild E.A., 2015. "Thermal response testing for ground source heat pump systems—An historical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 50(C), pages 1125-1137.
    2. Eslami-nejad, Parham & Bernier, Michel, 2012. "Freezing of geothermal borehole surroundings: A numerical and experimental assessment with applications," Applied Energy, Elsevier, vol. 98(C), pages 333-345.
    3. Zhang, Changxing & Guo, Zhanjun & Liu, Yufeng & Cong, Xiaochun & Peng, Donggen, 2014. "A review on thermal response test of ground-coupled heat pump systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 40(C), pages 851-867.
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    Cited by:

    1. Antonella Priarone & Stefano Morchio & Marco Fossa & Samuele Memme, 2023. "Low-Cost Distributed Thermal Response Test for the Estimation of Thermal Ground and Grout Conductivities in Geothermal Heat Pump Applications," Energies, MDPI, vol. 16(21), pages 1-16, November.
    2. Tangnur Amanzholov & Abzal Seitov & Abdurashid Aliuly & Yelnar Yerdesh & Mohanraj Murugesan & Olivier Botella & Michel Feidt & Hua Sheng Wang & Yerzhan Belyayev & Amankeldy Toleukhanov, 2022. "Thermal Response Measurement and Performance Evaluation of Borehole Heat Exchangers: A Case Study in Kazakhstan," Energies, MDPI, vol. 15(22), pages 1-31, November.
    3. Yu, Ziwang & Ye, Xiaoqi & Zhang, Yanjun & Gao, Ping & Huang, Yibin, 2023. "Experimental research on the thermal conductivity of unsaturated rocks in geothermal engineering," Energy, Elsevier, vol. 282(C).

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