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Efficient usage of waste heat by applying a seasonal energy storage (BTES) at ITT Water & Wastewater AB, Emmaboda, Sweden O. Andersson1), L. Rydell2), T. Algotsson2) 1) SWECO Environment AB, PO Box 286, SE-201 22 Malmö. Tel. +46 40 167000 olof.andersson@sweco.se 2) ITT Water and Waste Water, Lindås, SE-361 80 Emmaboda. Tel. +46 471 247000 ABSTRACT ITT W&W is a world leading manufacturer of submersible pumps and mixers. The Emmaboda plant contains a foundry, an electric motor workshop and several product workshops. The foundry generates a large amount of waste heat that is disposed to the atmosphere at all times. In order to utilize the waste heat to a larger extent than at current, high temperature borehole storage (HT-BTES) is under development. In this paper the designing results from the design of the storage system are described. 1. INTRODUCTION The foundry at ITT W&W encounters a large consumption of electricity with a high waste heat potential. The plant is run some 4 400 hours a year and approx. 10 GWh of heat, is disposed to the atmosphere over a year. Even if some already is recovered at winter time, the recovery can be substantially increased by applying a high temperature borehole seasonal storage (HT-BTES). Such a system will replace most of the externally supplied district heating (DH) that is currently used for space heating. By using a storage system, combined with heat pumps, ITT W&W expects to increase the recovery of waste heat to such a level that the dependence of DH will be reduced to a minimum. Economical support for the project has been granted by KLIMP (a regional granting of projects reducing the climate change). At present the project is preliminary designed and tender documents for construction has been worked out. 2. SYSTEM DESCRIPTION As shown in the figure 1, the ovens are currently chilled in two steps. In first step heat from the ovens is transferred to the local DH system through HEX 2. In the second step the ovens are chilled by a cooling tower through HEX 3. In between HEX 3 and the cooling tower there is a water basin that evens out the temperature swings from the ovens. The water basin also serves as a cooling medium for number of other minor processes. (These functions are not shown in the figure). A major part of the heat needed for space heating at the factory is currently supplied by external district heating through HEX 1.PDF Image | Efficient usage of waste heat by applying a seasonal energy storage (BTES) at ITT Water & Wastewater AB, Emmaboda, Sweden
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