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Experimental Hydration Temperature Increase in Borehole Heat Exchangers during Thermal Response Tests for Geothermal Heat Pump Design

Author

Listed:
  • Fabio Minchio

    (Studio 3F Engineering, Via IV Novembre 14, 36051 Creazzo, Italy)

  • Gabriele Cesari

    (Geo-Net S.r.l., Via Giuseppe Saragat 5, 40026 Imola, Italy)

  • Claudio Pastore

    (Geo-Net S.r.l., Via Giuseppe Saragat 5, 40026 Imola, Italy)

  • Marco Fossa

    (DIME Department of Mechanical, Energy, Management and Transportation Engineering, the University of Genova, Via Opera Pia 15a, 16145 Genova, Italy)

Abstract

The correct design of a system of borehole heat exchangers (BHEs) is the primary requirement for attaining high performance with geothermal heat pumps. The design procedure is based on a reliable estimate of ground thermal properties, which can be assessed by a Thermal Response Test (TRT). The TRT analysis is usually performed adopting the Infinite Line Source model and is based on a series of assumptions to which the experiment must comply, including stable initial ground temperatures and a constant heat transfer rate during the experiment. The present paper novelty is related to depth distributed temperature measurements in a series of TRT experiments. The approach is based on the use of special submersible sensors able to record their position inside the pipes. The focus is on the early period of BHE installation, when the grout cement filling the BHE is still chemically reacting, thus releasing extra heat. The comprehensive dataset presented here shows how grout hydration can affect the depth profile of the undisturbed ground temperature and how the temperature evolution in time and space can be used for assessing the correct recovery period for starting the TRT experiment and inferring information on grouting defects along the BHE depth.

Suggested Citation

  • Fabio Minchio & Gabriele Cesari & Claudio Pastore & Marco Fossa, 2020. "Experimental Hydration Temperature Increase in Borehole Heat Exchangers during Thermal Response Tests for Geothermal Heat Pump Design," Energies, MDPI, vol. 13(13), pages 1-16, July.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:13:p:3461-:d:380283
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    References listed on IDEAS

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    1. Aranzabal, Nordin & Martos, Julio & Steger, Hagen & Blum, Philipp & Soret, Jesús, 2019. "Temperature measurements along a vertical borehole heat exchanger: A method comparison," Renewable Energy, Elsevier, vol. 143(C), pages 1247-1258.
    2. Fossa, M. & Priarone, A. & Silenzi, F., 2020. "Superposition of the single point source solution to generate temperature response factors for geothermal piles," Renewable Energy, Elsevier, vol. 145(C), pages 805-813.
    3. Hossein Javadi & Seyed Soheil Mousavi Ajarostaghi & Marc A. Rosen & Mohsen Pourfallah, 2018. "A Comprehensive Review of Backfill Materials and Their Effects on Ground Heat Exchanger Performance," Sustainability, MDPI, vol. 10(12), pages 1-22, November.
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    Cited by:

    1. Ignacio Martín Nieto & Cristina Sáez Blázquez & Arturo Farfán Martín & Diego González-Aguilera, 2020. "Analysis of the Influence of Reducing the Duration of a Thermal Response Test in a Water-Filled Geothermal Borehole Located in Spain," Energies, MDPI, vol. 13(24), pages 1-19, December.

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