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25/10/2012 | News, Newsletter October 2012
Braedstrup Solar Park in Denmark is now a reality!

The solar heating system in Brædstrup has been extended from 8600 m² to 18600 m². There is established a pilot borehole storage where 19000 m³ of soil is charged with nearly 500 MWh heat at an average temperature of approx. 65 °C.

Now the total solar system produces around 20% of the heat production demand in Braedstrup.

In connection with the project is installed a newly developed ammonia-cooled screw compressor heat pump with an electric effect of 400 kW. The heat pump is boosting the temperature up from the borehole and the steel storage tanks to approx. 80 °C.

The 2nd steel storage tanks have a total water content of 7500 m³.

In order to increase revenues in the electricity market there is also installed a 10 MW electric boiler. This boiler and the heat pump are started up when electricity from among others the many wind turbines in the country, is higher than the overall consumption. Conversely starts the natural gas-fired generating systems when there is too little electricity in the power system.

Both the electricity boiler and the generating systems participate rather active on the frequency markets.

In this way, an interaction between electricity and district heating systems is secured and the technologies in Braedstrup contribute to the stabilization of the electricity power system.

This interaction between the energy technologies is a prerequisite for a phase-out of fossil fuels in favor of renewable energy technologies.

What next in Braedstrup?

If the pilot borehole storage system performs to the expectations and the calculations, the long-term plans are again to make an expansion of the solar area. This time to a total collector area of 50000 m² along with also an expansion of the borehole storage system accordingly. Thus, 50% of the total heat demand will be covered by solar. The remaining production is expected to be covered by the electric boiler and biogas.

Source: Braedstrup Fjernvarme

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