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The influence of the thermosiphon effect on the thermal response test

Author

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  • Gehlin, S.E.A.
  • Hellström, G.
  • Nordell, B.

Abstract

The issue of natural and forced groundwater movements, and its effect on the performance of ground heat exchangers is of great importance for the design and sizing of borehole thermal energy systems (BTESs). In Scandinavia groundwater filled boreholes in hard rock are commonly used. In such boreholes one or more intersecting fractures provide a path for groundwater flow between the borehole and the surrounding rock. An enhanced heat transport then occurs due to the induced convective water flow, driven by the volumetric expansion of heated water. Warm groundwater leaves through fractures in the upper part of the borehole while groundwater of ambient temperature enters the borehole through fractures at larger depths. This temperature driven flow is referred to as thermosiphon, and may cause considerable increase in the heat transport from groundwater filled boreholes. The thermosiphon effect is connected to thermal response tests, where the effective ground thermal conductivity is enhanced by this convective transport. Strong thermosiphon effects have frequently been observed in field measurements. The character of this effect is similar to that of artesian flow through boreholes.

Suggested Citation

  • Gehlin, S.E.A. & Hellström, G. & Nordell, B., 2003. "The influence of the thermosiphon effect on the thermal response test," Renewable Energy, Elsevier, vol. 28(14), pages 2239-2254.
    • Handle: RePEc:eee:renene:v:28:y:2003:i:14:p:2239-2254
    DOI: 10.1016/S0960-1481(03)00129-0
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    Citations

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    Cited by:

    1. Raymond, J. & Therrien, R. & Gosselin, L. & Lefebvre, R., 2011. "Numerical analysis of thermal response tests with a groundwater flow and heat transfer model," Renewable Energy, Elsevier, vol. 36(1), pages 315-324.
    2. Spitler, Jeffrey D. & Gehlin, Signhild E.A., 2015. "Thermal response testing for ground source heat pump systems—An historical review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 50(C), pages 1125-1137.
    3. Wu, Xuan & Wang, Zhengwen & Jin, Guang & Yang, Xue & Zhang, Zhiqiang & Bi, Wenming, 2016. "Development and experimental study on testing platform for rock-soil thermal response tester," Renewable Energy, Elsevier, vol. 87(P1), pages 765-771.
    4. Choi, Wonjun & Ooka, Ryozo, 2016. "Effect of natural convection on thermal response test conducted in saturated porous formation: Comparison of gravel-backfilled and cement-grouted borehole heat exchangers," Renewable Energy, Elsevier, vol. 96(PA), pages 891-903.
    5. Spitler, Jeffrey D. & Javed, Saqib & Ramstad, Randi Kalskin, 2016. "Natural convection in groundwater-filled boreholes used as ground heat exchangers," Applied Energy, Elsevier, vol. 164(C), pages 352-365.
    6. Hakala, Petri & Vallin, Sami & Arola, Teppo & Martinkauppi, Ilkka, 2022. "Novel use of the enhanced thermal response test in crystalline bedrock," Renewable Energy, Elsevier, vol. 182(C), pages 467-482.
    7. Gustafsson, A.-M. & Westerlund, L., 2010. "Multi-injection rate thermal response test in groundwater filled borehole heat exchanger," Renewable Energy, Elsevier, vol. 35(5), pages 1061-1070.
    8. Zhang, Xueping & Han, Zongwei & Ji, Qiang & Zhang, Hongzhi & Li, Xiuming, 2021. "Thermal response tests for the identification of soil thermal parameters: A review," Renewable Energy, Elsevier, vol. 173(C), pages 1123-1135.

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