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10
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There are drainwater heat recovery systems in production. It is mostly made of copper and in principle it's a passive, opposite flow heat exchanger. The freshwater coming to the house circulates throu …
answered Feb 3 '13 by Peter Ivan
1
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Tracking PV means (by it's definition) a more complex construction. It means more complex servicing and installation. But why not add features to reach a much better solar gain and lower price per Wat …
answered Feb 7 '15 by Peter Ivan