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Pumping up the heat for a climate-friendly future
Date:6/11/2010

The chaos caused by a volcanic eruption in Iceland April 2010 and the dispersal of its ash cloud across European airspace was a reminder of the tremendous forces of nature that exist below the ground. Not all subterranean heat sources have such sinister power, however. Across Europe, there are plentiful sources of geothermal energy: heat stored in the ground which can be tapped to provide a renewable and inexhaustible energy supply. Using the right technology to access this power at varying depths and temperatures, we can use this heat to reduce our dependence on imported and climate-damaging fossil fuels.

Until recently, the technology to exploit geothermal energy in a cost-effective way has remained under-developed. However, in response to the growing economic and policy pressures to cut CO2 emissions and improve energy security, one company set out to change this state of affairs, with remarkable results.

The small spa-town of Lendava, Slovenia, draws on a deep geothermal well 1,500 metres below the ground to supply its district heating network. The 70 degrees Celsius water is used to heat schools, sports centres, shops, businesses and apartment buildings. However, once used, the water is still around 50 degrees Celsius: too cool to re-use for space heating but too warm to re-inject into the well (or dispose of in the local environment).

Nafta Geoterm, the firm that manages the well, was convinced it could make better use of its resource and reuse this 'waste' water. The solution, proposed by Professor Darko Goricanec at the nearby University of Maribor's faculty of chemistry and chemical engineering, was to devise a high-temperature heat pump that could reheat geothermal source water from around 40 degrees up to 80 degrees, at which point it could be reused for space heating. While many heat pumps on the market were able to heat water from around 25 degrees to 60 degrees, none could deliver the high temperatures (80-90
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Contact: Piotr Pogorzelski
piotr.pogorzelski@eurekanetwork.org
322-777-0979
EUREKA
Source:Eurekalert

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