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Stirling engines have been around for a long time (almost 300 years), lots of big companies have researched them but no one has made them practical.
They don't run off of any particular fuel source (which is good) they can run off of any heat source. The efficiency of the engine is actually based on the high and low temperatures; a big temperature differential is more efficient.
You'll probably get introduced to them in college physics or thermodynamics (ie they're not that mysterious or archaic.)
Dan
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