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Old 08-11-2008, 03:49 PM   #3 (permalink)
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Problem is that the thermoelectric diodes aren't all that efficient. Not a problem for a nuclear-powered space probe, of course. Another and more efficient way of reclaiming exhaust energy I've seen is to let it spin a turbine (like a turbocharger), but have a generator in place of the intake side. Called a "TIGER", IIRC.
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