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Energy Performance of a Heating System via Wastewater Management

In this paper, the actual heat energy output and economic performance of a heat pump are being stated. A recent installation of a water source heat pump (WSHP) at the Glasgow Subway Station, has been using the subsurface water ingress to provide heating and domestic hot water. The continuous water flow at a relatively high temperature enabled the system to operate with the same efficiency as a typical heat pump system, but with a reduced installation cost due to the non-existence of boreholes or trenches. The performance of this setup has been monitored for a short period and the coefficient of performance, as well as energy saving, is reported in the present paper. An average COP of 2,5 and a 60% energy input reduction for the heating system based on the old heating system’s energy demand indicates the actual system’s performance. The output of this study indicates the financial benefit as well as the energy and carbon reduction of the heating system. It also highlights key issues which were encountered in such a challenging underground environment. Opportunities to further commercialize the excess heat energy output are explored.