Use of Electrical Resistivity Tomography measurements for investigation of different grouting materials for very shallow geothermal applications within varying seasonal conditions; applied on a geothermal Earth-Air Heat Exchanger system.
Schwarz H, Lin J, Bertermann D (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Pages Range: 120664
Article Number: 120664
DOI: 10.1016/j.renene.2024.120664
Abstract
To achieve the current climate targets, heat pump systems like very shallow geothermal applications are gaining ground. However, the dimensioning of these ground coupled systems is soil-dependent and thus subject to significant differences in efficiency. Furthermore, the thermal properties of the grouting materials are essential for heat transfer in the direct vicinity of the geothermal application. To provide a non-invasive assessment of relevant soil and grouting characteristics, electrical resistivity tomography (ERT) measurements were performed.
In this case, the surrounding of an Earth Air-Heat Exchanger – system (EAHE) with different grouting materials (fine sand and fine sand with bentonite) was investigated. For investigation the electrical resistivity (ER) of initial and modified soil conditions were measured regarding soil texture and moisture content. Thereby, the different grouting materials are clearly identified. Thus, based on the ERT measurements, a characterisation of key soil and grouting material properties for applications focusing on heat transfer in soil has been carried out.
Furthermore, the depth of soil disturbance due to the EAHE installation could have been traced.
Due to a monitoring over different season (February and May) changes in raw ER data could have been ascribed to temperature changes.
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France (FR)How to cite
APA:
Schwarz, H., Lin, J., & Bertermann, D. (2024). Use of Electrical Resistivity Tomography measurements for investigation of different grouting materials for very shallow geothermal applications within varying seasonal conditions; applied on a geothermal Earth-Air Heat Exchanger system. Renewable Energy, 120664. https://doi.org/10.1016/j.renene.2024.120664
MLA:
Schwarz, Hans, Jian Lin, and David Bertermann. "Use of Electrical Resistivity Tomography measurements for investigation of different grouting materials for very shallow geothermal applications within varying seasonal conditions; applied on a geothermal Earth-Air Heat Exchanger system." Renewable Energy (2024): 120664.
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