In large cities such as Cologne, heat generation accounts for more than two-thirds of stationary energy consumption. This is why it was necessary to consider ways to make more efficient use of non-fossil energy sources and create more sustainable heating systems in metropolitan areas. One idea was to recover heat from wastewater systems that is currently simply flushed away. Within the CELSIUS project, the city of Cologne focused on using wastewater along with geothermal energy, solar energy and wood pellets as a sustainable source of heat for large buildings – a sensible addition to an economically viable mix of energy sources that includes natural gas, district heating systems and local heating sources. Wastewater systems promise major heat recovery potential. Studies have shown that around 20 % of all buildings in Germany could be heated using this technology. However, so far most projects have failed in the face of technical and/or financial obstacles. The CELSIUS project seeked to identify the most effective methods so as to increase the success rate of future projects. The potential of this technology is demonstrated in two locations in Cologne: the districts of Wahn and Mulheim.
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Waste heat recovery from sewage water
The projects entails the installation of a heat exchanger and water-to-water heat pumps that will recover the heat from sewage water in order to improve the efficiency of gas fired heaters in schools
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