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Influence on thermal response test by groundwater flow in vertical fractures in hard rock

Author

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  • Gehlin, S.E.A.
  • Hellström, G.

Abstract

In this paper different approaches to groundwater flow and its effect in the vicinity of a borehole ground heat exchanger are discussed. The common assumption that groundwater flow in hard rock may be modelled as a homogeneous flow in a medium with an effective porosity is confronted and models for heat transfer due to groundwater flow in fractures and fracture zones are presented especially from a thermal response test point of view. The results indicate that groundwater flow in fractures even at relatively low specific flow rates may cause significantly enhanced heat transfer, although a continuum approach with the same basic assumptions would suggest otherwise.

Suggested Citation

  • Gehlin, S.E.A. & Hellström, G., 2003. "Influence on thermal response test by groundwater flow in vertical fractures in hard rock," Renewable Energy, Elsevier, vol. 28(14), pages 2221-2238.
    • Handle: RePEc:eee:renene:v:28:y:2003:i:14:p:2221-2238
    DOI: 10.1016/S0960-1481(03)00128-9
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