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Estimating the Geothermal Potential of the Tunnel lining Heat Exchanger Enhancement with Thermally Conductive Matter
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, The Third Sustainable Earth Sciences Conference and Exhibition, Oct 2015, Volume 2015, p.1 - 5
Abstract
Summary
Utilization of the rock massif by tunnels or utility corridors as a heat source or heat storage leads to energy savings. This work presents an evaluation of a heat exchanger enhancement with a thermally conductive matter (TCM) in tunnel lining. The heat exchanger with TCM is meant to be placed between the primary and secondary lining. The evaluation is based on a finite element simulations. Also the influence of the heat exchanger tube spacing was investigated. The extractable heat from the rock massif ranges from 10 to 90 W per meter. The heat exchanger conductivity enhancement resulted into 4 to 30 % benefit.
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