This project investigates the potential benefits of combining cooling of London underground train tunnels with the transfer of heat to district heating networks. Instead of using air cooled chillers to cool the air in the underground tunnels, it is planned to use water to water heat pumps to transfer the heat to a district heating network. This should significantly reduce the total energy input required for both the heating and cooling of the respective networks. It has been previously estimated that there is at least 25 MW of waste heat available from cooling the London underground system.
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