Friday, August 31, 2007

Geothermal System heat 50 households in Sweden

50 households in Anneburg, Sweden, have been relying on solar heating for the past two years with the Borehole Thermal Energy Storage system. This country sees little daylight for much of the winter but during the summer, water is pumped through rooftop solar heaters to warm it and stored in pipes embedded in granite 35 to 65 metres below ground. this technique is simple to construct and operate and can also be installed virtually anywhere, making them ideal for urban and developed areas. Loops of plastic tubing are installed in the boreholes, and fluid is circulated through the loops. Waste hot energy is stored in the rock during the summer for use in the winter.

The system has reduced reliance on conventional heating by nearly 25 per cent. This could rise to 70 per cent over the next few years as the storage rocks get hotter.

Borehole Thermal Energy Storage systems store also cool energy in soil and rock.

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