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A case study of a long-duration thermal response test in borehole heat exchangers

A case study of a long-duration thermal response test in borehole heat exchangers
A case study of a long-duration thermal response test in borehole heat exchangers
Shallow closed-loop geothermal systems are worldwide applied providing economical and environmental benefits. This paper presents an in-situ study of four Borehole Heat Exchangers of 100 m long, installed in an heterogeneous bedrock in the campus of the University of Liege (Liege, Belgium). A Thermal Response Test (TRT) of a heating phase of 7 months was conducted in one of the boreholes. During this test, temperature was measured at the pipe inlet and outlet, as well as along the four boreholes by the fiber optics. To further investigate the measured data, the test was simulated by 3D numerical modeling. The comparison of the measured data with the numerical results allowed to detect the critical parameters for the behavior of the BHE and for the temperature evolution in the surrounding rock mass. In this case study, the behavior of the BHE could be predicted based on the results of a typical-duration TRT (of a few days), considering the ground an homogenous and isotropic material. However, the thermal plume in the surrounding ground seems to be influenced by several factors, such as the bedrock heterogeneity, the distance to the heating source, air temperature variations and thermal effects at the borehole bottom end.
Geothermal systems, High-resolution temperature profiles, Numerical modeling, Thermal response test
Springer Verlag
Radioti, Georgia
f8886b45-0737-4bf4-8332-f3fe4a4f060e
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Charlier, Robert
3bba8221-b05d-431a-8a41-40f1b5dcc7e8
Nguyen, Frederic
383e8608-f941-4445-a65c-ba2cc98cba28
Tran-Nguyen, H.H.
Wong, H.
Ragueneau, F.
Ha-Minh, C.
Radioti, Georgia
f8886b45-0737-4bf4-8332-f3fe4a4f060e
Cerfontaine, Benjamin
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Charlier, Robert
3bba8221-b05d-431a-8a41-40f1b5dcc7e8
Nguyen, Frederic
383e8608-f941-4445-a65c-ba2cc98cba28
Tran-Nguyen, H.H.
Wong, H.
Ragueneau, F.
Ha-Minh, C.

Radioti, Georgia, Cerfontaine, Benjamin, Charlier, Robert and Nguyen, Frederic (2018) A case study of a long-duration thermal response test in borehole heat exchangers. Tran-Nguyen, H.H., Wong, H., Ragueneau, F. and Ha-Minh, C. (eds.) In Proceedings of the 4th Congrès International de Géotechnique - Ouvrages -Structures. CIGOS 2017. vol. 8, Springer Verlag. 7 pp . (doi:10.1007/978-981-10-6713-6_63).

Record type: Conference or Workshop Item (Paper)

Abstract

Shallow closed-loop geothermal systems are worldwide applied providing economical and environmental benefits. This paper presents an in-situ study of four Borehole Heat Exchangers of 100 m long, installed in an heterogeneous bedrock in the campus of the University of Liege (Liege, Belgium). A Thermal Response Test (TRT) of a heating phase of 7 months was conducted in one of the boreholes. During this test, temperature was measured at the pipe inlet and outlet, as well as along the four boreholes by the fiber optics. To further investigate the measured data, the test was simulated by 3D numerical modeling. The comparison of the measured data with the numerical results allowed to detect the critical parameters for the behavior of the BHE and for the temperature evolution in the surrounding rock mass. In this case study, the behavior of the BHE could be predicted based on the results of a typical-duration TRT (of a few days), considering the ground an homogenous and isotropic material. However, the thermal plume in the surrounding ground seems to be influenced by several factors, such as the bedrock heterogeneity, the distance to the heating source, air temperature variations and thermal effects at the borehole bottom end.

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More information

Published date: 1 January 2018
Keywords: Geothermal systems, High-resolution temperature profiles, Numerical modeling, Thermal response test

Identifiers

Local EPrints ID: 444129
URI: http://eprints.soton.ac.uk/id/eprint/444129
PURE UUID: 639e3bd7-6b20-4e19-af58-239096407f56
ORCID for Benjamin Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

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Date deposited: 28 Sep 2020 16:33
Last modified: 16 Sep 2021 11:14

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Contributors

Author: Georgia Radioti
Author: Robert Charlier
Author: Frederic Nguyen
Editor: H.H. Tran-Nguyen
Editor: H. Wong
Editor: F. Ragueneau
Editor: C. Ha-Minh

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