Journal
GEOTHERMICS
Volume 51, Issue -, Pages 380-387Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2014.02.007
Keywords
Energy geostructure; Tunnel anchor; Geothermal energy; Optimisation; Finite-element analysis
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Funding
- Swiss Tunnelling Society [FGU 2009/002]
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This study addresses the geothermal potential of using the anchors of a cut-and-cover tunnel as heat exchangers with the ground for seasonal heat storage. The influence of the soil properties and water table level were investigated. Various service conditions were examined, optimised and compared using finite-element analyses. The extractable heat from the ground through the anchors, per year and per kilometre of tunnel, ranges from 0.4 to 0.8 GWh. The seasonal heat storage is shown to be an important factor for the efficiency and sustainability of the heat source. (C) 2014 Elsevier Ltd. All rights reserved.
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