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Temperature measurements along a vertical borehole heat exchanger: A method comparison

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  • Aranzabal, Nordin
  • Martos, Julio
  • Steger, Hagen
  • Blum, Philipp
  • Soret, Jesús

Abstract

The standard thermal response tests (TRT) provide integral and effective thermal parameters of the ground in the vicinity of borehole heat exchangers (BHE). However, typical ground properties are heterogeneously distributed. As a result, advanced TRT such as distributed and enhanced TRT are growing in popularity as they provide more spatial information of the thermal properties. Thus, the objective of this study is to compare various instruments to measure the depth-dependent temperatures using standard Pt100-sensors, fiber optical thermometers and novel instruments such as Geowire, Geoball and GEOsniff®. The investigations are carried out in a 30 m length test borehole. The results showed an excellent agreement between both the Geowire and GEOsniff® in comparison with Pt100-sensors with a root mean squared error of 0.10 and 0.09 K, respectively. The results also suggest that the novel instruments have various advantages over the standard sensors and fiber optics. For example, with the novel instruments comparable, accurate, inexpensive, instantaneous and higher spatial resolution temperature measurements are obtained. Finally, the outcome of this study provides a guide for choosing the adequate temperature measurement along a BHE thus generally improving the evaluation of advanced TRT, while potentially increasing efficiency and economic viability of ground-source heat pump systems.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:renene:v:143:y:2019:i:c:p:1247-1258
    DOI: 10.1016/j.renene.2019.05.092
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    2. Li, Min & Zhang, Liwen & Liu, Gang, 2020. "Step-wise algorithm for estimating multi-parameter of the ground and geothermal heat exchangers from thermal response tests," Renewable Energy, Elsevier, vol. 150(C), pages 435-442.
    3. 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.
    4. Hans Schwarz & Borja Badenes & Jan Wagner & José Manuel Cuevas & Javier Urchueguía & David Bertermann, 2021. "A Case Study of Thermal Evolution in the Vicinity of Geothermal Probes Following a Distributed TRT Method," Energies, MDPI, vol. 14(9), pages 1-17, May.
    5. Wilke, Sascha & Menberg, Kathrin & Steger, Hagen & Blum, Philipp, 2020. "Advanced thermal response tests: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    6. Zhang, Tiansheng & Liu, Chun & Bayer, Peter & Zhang, Liwei & Gong, Xulong & Gu, Kai & Shi, Bin, 2022. "City-wide monitoring and contributing factors to shallow subsurface temperature variability in Nanjing, China," Renewable Energy, Elsevier, vol. 199(C), pages 1105-1115.

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