Paris Uses Metro Heat to Warm City Apartments
Metro Heating Will Cut Carbon Emissions by One Third
An innovation in Paris is using heat from the metro to warm buildings in the city. Each metro rider gives off about 100 watts per person, and a new project is harnessing this heat to warm city apartments. This is a pretty reliable way of heating the apartments since the subway stays a fairly constant temperature all year round due to the heat released by people and moving trains in the tunnels and the insulation from the weather outside. The building being heated is already connected to the metro by a staircase, and this connection is being used to transfer the heat into the building.
The process is similar to the way geothermal energy is harnessed. The project is going to augment the heating system already in place rather than replace it. Heating the 17 flats in this building using the heat from the metro is expected to cut carbon emissions by a third.
The project will be launched by the end of the year, and work will start in 2011. This is the only such project in Paris. Although Paris is not planning on adding this form of heating to other buildings because of the prohibitive cost of connecting the buildings to the subway, a similar project is underway in Austria.