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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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3. FUNCTIONAL DESCRIPTION The connections to the internal DH are such that heat can be delivered to both the supply and the return pipe of the DH net. The primary source will always be the direct heat recovery from the ovens through HEX2, followed by the heat pumps for additional heat. All surplus heat, not used in the internal DH, will be stored in BTES at the highest temperature level possible (max. +70oC). Discharging the storage will always be done to the return pipe. With such a connection only peak loads, if any, can be covered by the external DH through HEX1. The BTES will have separate sections with an inner “hot centre” and an outer “less hot mantle”. The reason for this design is to adjust the production temperature to the actual temperature demand and to occasionally allow a short term storage function located to the “hot centre”. 4. BASIS FOR SYSTEM DESIGN The two latest years, that has been mild winters, the internal DH system has distributed approx. 8 000 MWh of heat annually. Of this some 5 000 MWh was supplied by the external DH system. The maximum heat load demand is around 3 800 kW at -18oC, see figure 2. This load is required during night time when there is no supply of waste heat from the foundry. With the planned heat recovery system the loads can be met down to a temperature of approx. -10oC. Figure 2: Heat load demand derived from delivery from the external DH (HEX1), based on plots of measured data from the years 2004-2007. Maximum values express a situation without any internal heat recovery from HEX2.

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