This project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 691624
In Braedstrup, Denmark, an existing 8,000 m² solar collector area feeding a district heating network, is in a first extension phase. It will be extended to 20,600 m², and combined with a borehole seasonal storage, to attain 20% of solar coverage.
The existing solar plant supplies through the local district heating net 1,200 homes, which have a heating demand of 40 GWh/a. It was inaugurated in 2007 by the Braedstrup District Heating Company as the first solar plant connected to a CHP power station. The hot water demand in the summer is thus completely covered, and the annual solar coverage for heating and hot water production is around 10 %.
During this first extension phase, the collector area is being extended to 20,600 m². To be able to use the solar energy produced when most needed and not only in summer, a borehole storage is added. Fifty probes are being put into the ground to a depth of 48 m. The heat produced in summer will circulate in these probes and heat up the ground around, creating a huge storage. In winter, when the heat will be needed by the district heating net, a heat pump will help transferring the heat back in the circuit. 20% of the annual demand should be covered by solar energy thanks to this combination.
Besides the mentioned technologies a 10 MW electric boiler has been installed. This is connected to the 10 kV electric grid when the electricity is very cheap and when there actually is too much electricity in the electric system. This phenomenon occurs, when the wind turbines produce more electricity than is consumed. This helps the electric system to stabilize the grid and stores electricity via heat production.
Right now the foundations for the 10,600 m2 solar heat are being cast. Inauguration of the entire system is expected around first of July 2012. But it goes further: the final plan is to extend the collector area to over 50,000 m², combined with 300 to 400 probes, in order to achieve a solar coverage of 50% of the annual heat demand.
Sources: Breadstrup District Heating Company, Sun and Wind Energy
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