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Experimental and numerical investigation of a long-duration Thermal Response Test

Experimental and numerical investigation of a long-duration Thermal Response Test
Experimental and numerical investigation of a long-duration Thermal Response Test
This paper presents in-situ measurements of a long-duration Thermal Response Test (TRT) (heating phase of 7 months), conducted in a heterogeneous bedrock of conduction dominated heat transfer. The in-situ test was simulated by 3D numerical modelling, by assuming homogeneous and isotropic ground conditions considering the TRT data of the first few days. Based on the analysis of the experimental and numerical results, the behaviour of the Borehole Heat Exchanger for longer heating and recovery periods can be predicted based on the typical-duration TRT results. However, this behaviour is sensitive to the heat input variations, indicating the need for an accurate estimation of the energy needs of the building and the variable thermal loading during the operation of the system. Critical factors for the prediction of the temperature field evolution in the surrounding ground were detected based on the analysis of high-resolution temperature profiles. They include the distance to the heating source, borehole bottom end effects, bedrock heterogeneity and air temperature variations. Anisotropic effects are not detected, despite the expected anisotropic behaviour of the bedrock.
3D numerical modelling, Closed-loop geothermal systems, Heterogeneity, High-resolution temperature measurements, Thermal Response Test duration
0375-6505
245-258
Radioti, G.
991f84a2-b6cd-43f9-95c7-439e57c054c0
Cerfontaine, B.
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Charlier, R.
3bba8221-b05d-431a-8a41-40f1b5dcc7e8
Nguyen, F.
2f52c33b-054d-49e1-9b97-b4e78ba5f521
Radioti, G.
991f84a2-b6cd-43f9-95c7-439e57c054c0
Cerfontaine, B.
0730daf4-9d6b-4f2d-a848-a3fc54505a02
Charlier, R.
3bba8221-b05d-431a-8a41-40f1b5dcc7e8
Nguyen, F.
2f52c33b-054d-49e1-9b97-b4e78ba5f521

Radioti, G., Cerfontaine, B., Charlier, R. and Nguyen, F. (2018) Experimental and numerical investigation of a long-duration Thermal Response Test. Geothermics, 71, 245-258. (doi:10.1016/j.geothermics.2017.10.001).

Record type: Article

Abstract

This paper presents in-situ measurements of a long-duration Thermal Response Test (TRT) (heating phase of 7 months), conducted in a heterogeneous bedrock of conduction dominated heat transfer. The in-situ test was simulated by 3D numerical modelling, by assuming homogeneous and isotropic ground conditions considering the TRT data of the first few days. Based on the analysis of the experimental and numerical results, the behaviour of the Borehole Heat Exchanger for longer heating and recovery periods can be predicted based on the typical-duration TRT results. However, this behaviour is sensitive to the heat input variations, indicating the need for an accurate estimation of the energy needs of the building and the variable thermal loading during the operation of the system. Critical factors for the prediction of the temperature field evolution in the surrounding ground were detected based on the analysis of high-resolution temperature profiles. They include the distance to the heating source, borehole bottom end effects, bedrock heterogeneity and air temperature variations. Anisotropic effects are not detected, despite the expected anisotropic behaviour of the bedrock.

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More information

Accepted/In Press date: 3 October 2017
e-pub ahead of print date: 22 October 2017
Published date: January 2018
Keywords: 3D numerical modelling, Closed-loop geothermal systems, Heterogeneity, High-resolution temperature measurements, Thermal Response Test duration

Identifiers

Local EPrints ID: 444128
URI: http://eprints.soton.ac.uk/id/eprint/444128
ISSN: 0375-6505
PURE UUID: b5cfdda2-88bd-4b9d-a0e2-61b0ec0f2f0e
ORCID for B. Cerfontaine: ORCID iD orcid.org/0000-0002-4833-9412

Catalogue record

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

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Contributors

Author: G. Radioti
Author: B. Cerfontaine ORCID iD
Author: R. Charlier
Author: F. Nguyen

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