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I read-up a little on the sterling engine a few years ago (regarding a hare-brained ecomodding idea, actually), but don't really remember too much about it. Seems they are really inefficient without the "optimiser", or whatever they called the compound stage, or whatever...
Wouldn't it be wild if the below-ground temperature differential could be used to power the sterling engine, then the output of the sterling engine be used for a ground-coupled heat pump, again benefitting from the stable below ground temps for HVAC dutyfor a building?
The ecomodder idea was to somehow utilise the waste heat from a car with a sterling engine, hooked to ???? dunno - a generator - the wheels - something.
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