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Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment

Author

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  • Radioti, G.
  • Sartor, K.
  • Charlier, R.
  • Dewallef, P.
  • Nguyen, F.

Abstract

This paper presents temperature measurements in four Borehole Heat Exchangers (BHEs), equipped with fiber optics and located in a semi-urban environment (campus of the University of Liege, Belgium). A 3D numerical model is also presented to simulate the heat loss from the surrounding structures into the subsurface. The mean undisturbed ground temperature was estimated from data during the preliminary phase of a thermal response test (water circulation in the pipe loops), as well as from borehole logging measurements. The measurements during water circulation can significantly overestimate the ground temperature (up to 1.7°C in this case study) for high ambient air temperature during the test, resulting in an overestimation of the maximum extracted power and of the heat pump coefficient of performance (COP). To limit the error in the COP and the extracted power to less than 5%, the error in the undisturbed temperature estimation should not exceed ±1.5°C and ±0.6°C respectively. In urbanised areas, configurations of short BHEs (length<40m) could be economically advantageous (decreased installation and operation costs) compared to long BHEs, especially for temperature gradient lower than −0.05°C/m.

Suggested Citation

  • Radioti, G. & Sartor, K. & Charlier, R. & Dewallef, P. & Nguyen, F., 2017. "Effect of undisturbed ground temperature on the design of closed-loop geothermal systems: A case study in a semi-urban environment," Applied Energy, Elsevier, vol. 200(C), pages 89-105.
    • Handle: RePEc:eee:appene:v:200:y:2017:i:c:p:89-105
    DOI: 10.1016/j.apenergy.2017.05.070
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    Citations

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    Cited by:

    1. Wilke, Sascha & Menberg, Kathrin & Steger, Hagen & Blum, Philipp, 2020. "Advanced thermal response tests: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    2. Zhang, Changxing & Song, Wei & Liu, Yufeng & Kong, Xiangqiang & Wang, Qing, 2019. "Effect of vertical ground temperature distribution on parameter estimation of in-situ thermal response test with unstable heat rate," Renewable Energy, Elsevier, vol. 136(C), pages 264-274.
    3. Wu, Wentao & Zhang, Wei & Benner, Jingru & Malkawi, Ali, 2020. "Critical evaluation of analytical methods for thermally activated building systems," Renewable and Sustainable Energy Reviews, Elsevier, vol. 117(C).
    4. Ana Vieira & Maria Alberdi-Pagola & Paul Christodoulides & Saqib Javed & Fleur Loveridge & Frederic Nguyen & Francesco Cecinato & João Maranha & Georgios Florides & Iulia Prodan & Gust Van Lysebetten , 2017. "Characterisation of Ground Thermal and Thermo-Mechanical Behaviour for Shallow Geothermal Energy Applications," Energies, MDPI, vol. 10(12), pages 1-51, December.
    5. Wanli Wang & Guiling Wang & Feng Liu & Chunlei Liu, 2022. "Characterization of Ground Thermal Conditions for Shallow Geothermal Exploitation in the Central North China Plain (NCP) Area," Energies, MDPI, vol. 15(19), pages 1-16, October.

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