iamgeo
Google the stirling engine. There is a lot of machining art work in those machines. But still we have to look at the process, energy in and out.
I had seen a while back a stirling engine (heat engine) that doubled as a furnace and provider of electricity for a small home in a compact little machine. It ran on natural gas as the heat source but very low temps. The machine was commercially avalible.
I would suspect the inertia of traditional furnaces and grid power forced this neat device into a commercial failure.
Randen
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