30 Jun '11, 6pm

"To design a house that's NOT passive solar amounts to a crime against nature."

Life is the only anti-entropic agency in the Universe, converting the low-exergy energy of the sun and simple molecules into highly ordered and complex biological creatures, but we're working counter to evolution unless we more properly match our energy sources to our energy sinks in terms of exergy--concentration or quality. In other words, if we need to keep our homes at a modest 70° or so, or heat our water to 140° (to keep it sterile), then we don't need to use a nuclear fission reaction at several thousands of degrees or even a coal, oil or gas fire at several hundreds of degrees. A far better match of input to output would be direct solar conversion, as passively as possible. (By the way, uranium contains about 17,000 times the energy of even extremely concentrated coal, by weight, and the uranium fuel cycle contributes as much CO2 per kWh produced as natural gas--so...

Full article: http://www.buildinggreen.com/live/index.cfm/2011/6/30/Des...

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