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Old 03-12-10, 08:27 AM   #20
Piwoslaw
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On a larger scale, in Sweden heat is recovered from waste treatment plants and used for district heating. The temperature of water leaving the sewage treatment plant is between 7-22*C, large heat pumps extract heat, cooling it to 1*C before it is dumped into the sea. This can cover as much as 10% of a city's heating needs.

See the links at the bottom of my post Sweden - Oil independance through conservation and efficiency
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