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Determination of the Temperature Development in a Borehole Heat Exchanger Field Using Distributed Temperature Sensing

Author

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  • David Bertermann

    (GeoZentrum Nordbayern, Chair of Geology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schlossgarten 5, 91054 Erlangen, Germany)

  • Oliver Suft

    (GeoZentrum Nordbayern, Chair of Geology, Friedrich-Alexander-Universität Erlangen-Nürnberg, Schlossgarten 5, 91054 Erlangen, Germany)

Abstract

The use of geothermal borehole heat exchangers (BHEs) in combination with ground-source heat pumps represents an important part of shallow geothermal energy production, which is already used worldwide and becoming more and more important. Different measurement techniques are available to examine a BHE field while it is in operation. In this study, a field with 54 BHEs up to a depth of 120 m below ground level was analyzed using fiber optic cables. A distributed temperature sensing (DTS) concept was developed by equipping several BHEs with dual-ended hybrid cables. The individual fiber optics were collected in a distributor shaft, and multiple measurements were carried out during active and inactive operation of the field. The field trial was carried out on a converted, partly retrofitted, residential complex, “Lagarde Campus”, in Bamberg, Upper Franconia, Germany. Groundwater and lithological changes are visible in the depth-resolved temperature profiles throughout the whole BHE field.

Suggested Citation

  • David Bertermann & Oliver Suft, 2024. "Determination of the Temperature Development in a Borehole Heat Exchanger Field Using Distributed Temperature Sensing," Energies, MDPI, vol. 17(18), pages 1-12, September.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:18:p:4697-:d:1482288
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    References listed on IDEAS

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    1. Robin Zeh & Björn Ohlsen & David Philipp & David Bertermann & Tim Kotz & Nikola Jocić & Volker Stockinger, 2021. "Large-Scale Geothermal Collector Systems for 5th Generation District Heating and Cooling Networks," Sustainability, MDPI, vol. 13(11), pages 1-18, May.
    2. Capozza, Antonio & De Carli, Michele & Zarrella, Angelo, 2013. "Investigations on the influence of aquifers on the ground temperature in ground-source heat pump operation," Applied Energy, Elsevier, vol. 107(C), pages 350-363.
    3. Acuña, José & Palm, Björn, 2013. "Distributed thermal response tests on pipe-in-pipe borehole heat exchangers," Applied Energy, Elsevier, vol. 109(C), pages 312-320.
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