Tunnel environments can typically be warmer than outside which raises the question as to whether this thermal energy can be recovered and put to use. This paper considers two methods of heat recovery from long tunnels; one using heat recovery pipes and one using a geothermal liner. It is predicted that both heat recovery pipes and geothermal liners should be able to recover thermal energy successfully from a tunnel. The paper provides some design guidance on these systems and then focusses on the linkage of heat recovery to stakeholders and how to maximise the benefits of these systems.
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