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Recycling Hot Air.(waste heat)(Brief article)
Byline: Jessica Bennett
We all know it's possible to save energy by recycling waste, but it's also possible to recycle waste energy. Physicists at the University of Utah have found a novel way to do it--by first turning waste heat into sound, and then turning the sound into electricity. They developed a cylindrical "heat engine" that soaks up the heat and pushes it to one end of the cylinder. Once it reaches a certain temperature threshold, it passes through a valve, which makes the air ...
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