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Efficient usage of waste heat by applying a seasonal energy storage (BTES) at ITT Water & Wastewater AB, Emmaboda, Sweden

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Efficient usage of waste heat by applying a seasonal energy storage (BTES) at ITT Water & Wastewater AB, Emmaboda, Sweden ( efficient-usage-waste-heat-by-applying-seasonal-energy-stora )

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Measurements from 2006-2007 indicate that the supply temperature in the internal DH system is at around +55oC during the coldest days of the winter. However, most of the winter season it is kept below +45oC, see figure 3. The return temperature is in general some 10oC lower and kept within the frame of +30-40oC. This indicates that the BTES easily can produce heat down to at least +40oC, maybe lower. These are all temperatures that can be expected to function with the planned heat recovery system. Figure 3: Supply and return temperatures in the internal district heating system during one full year. The high temperature peaks during the summer is due to dumping of heat to the DH without being used. 5. BASIS FOR BTES DESIGN Since the geological conditions are similar all over the factory area, the only criteria are (a) that the storage should be located close to the existing local DH system, (b) the storage will not interfere with the factory activities during construction, and (c) that it will not interfere with future building plans. From these criteria the borehole field has been located to a “recreation” area close to a dam, see figure 4. The ground here is flat and is partly a lawn and partly an asphalted bus parking place. The hydro-geological conditions at site have been documented by two investigation boreholes placed at each side of the site (distance between approx. 50 m). The main results from these drillings are:

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Efficient usage of waste heat by applying a seasonal energy storage (BTES) at ITT Water & Wastewater AB, Emmaboda, Sweden

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