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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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• The soil consists of 7-8 m of glacial till • The rock types, down to a depth of 200 m, consists of diorite (55 %) gneiss and granites (25 %) and amphibolites (20 %) • The upper 2-3 m of the rock is fractured and unstable, which means that casing has to be drilled to some 12 m. • Ground water yielding zones were penetrated at a depth of 35-40 m in both holes and at 70 m in one hole. However, the hydraulic conductivity is low, approx. 1-2 x 10-6 m/s. • The ground water level in rock is approx. 2 m below surface. Figure 4: The ITT industrial area Emmaboda with the location of the BTES site (red square) The thermal properties have been measured by thermal response tests (TRT) in both the test holes. The distance between the two holes is approx 50 m and they were both drilled to 200 m. The measurements show the following results: • The ambient temperature in the rock is +8oC and the geothermal gradient is 1, 5oC/100 m. • The thermal conductivity of the rock mass is 3, 2 W/m,K in average (3,0 and 3, 4 ) • The thermal resistance with water filled boreholes and single U-pipes is 0, 06 K(W/m) 6. PRELIMINARY BTES DESIGN Measurements have shown that there will be around approx. 3 000 MWh surplus heat that can be stored during the summer season (May-September). During autumn, winter and spring there is another 800 MWh of heat that can be supplied to the BTES system, mainly with on short term

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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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