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basis. Hence, some 3 800 MWh of excess heat is estimated to be the potential for storage of which 3 000 MWh is seasonal. Of this heat approx. 1 500 MWh is generated by the heat pumps. For the design of number of boreholes, depth and distance between holes at a given surface area the simulation model EED (Earth Energy Design) has been used. The simulations preliminary indicate that 140 boreholes á 150 m with a rectangular shape and a hole distance of 5 m is optimal for a storage of 3 000 MWh. The additional 800 MWh for short term storage during the winter season does not take any extra holes. This energy lies “on top” with a higher temperature quality and less losses. Taken into account that the average time for the seasonal storage is six months, and that the storage working temperature is +60/40oC, the storage losses is estimated to be in the order 1 200 MWh (68, 5%). Hence, 2 600 MWh will be recovered and utilized. According to the calculations the storage will be able to deliver a load capacity of some 1 100 kW at a maximum (early winter and short term cycles). However, at the end of the space heating season, the capacity may drop down to 100 kW at the lowest (short term cycles excluded). The average load capacity during the winter season is approx. 700 kW. Due to the high temperature and to achieve a high thermal performance, a specially constructed borehole heat exchanger (BHE) will be used. The BHE will consist of a single 90 mm centralized plastic tube inserted into a 115 mm borehole. The tube material will be PEX, a plastic material that keep its strength at temperatures up to at least +80oC. In the simulations with EED, a thermal borehole resistance of 0, 01 K/(W/m) has been assumed for this type of BHE. A prototype will be tested before solution can be used. In the design it has also been considered to have a reversed flow possibility over the BHE. By charging from beneath and upwards and discharging with a reversed flow direction, the performance is expected to be optimal from a temperature point of view. 7. PRELIMINARY ECONOMICS The investment cost for the total system has been calculated to approx. 10, 6 Million SEK split into the following items: • Heat pump HP1, installation and side equipments included, 1 700 Thousand SEK • Heat pump HP2, installation and side equipments included, 1 200 Thousand SEK • BTES, boreholes and piping system, heat exchanger included, 6 500 Thousand SEK • Controlling system and power supply, 1 200 Thousand SEK The investment is estimated to reduce the dependence of external DH with 4 800 MWh annually. Of this reduction the BTES will supply 2 600, while 2 200 will be produced directly by the two heat pumps. The economic value of the savings is currently 2 250 Thousand SEK annually (470 SEK/MWh). For running the system, mainly the heat pumps, 650 MWh of electricity is used. The present annual cost for this is 300 Thousand SEK (450 SEK/MWh). Based on these figures, the annualPDF Image | Efficient usage of waste heat by applying a seasonal energy storage (BTES) at ITT Water & Wastewater AB, Emmaboda, Sweden
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