A Stirling engine is a heat engine that operates by cyclic compression and expansion of atmospheric air or other gas as a working fluid at different temperatures, such that there is net conversion of heat energy to mechanical work. More specifically, the Stirling engine is a closed-cycle regenerative heat engine with a permanently gaseous working fluid. The Stirling engine is known for its higher efficiency than steam engine, quiet operation, and the ability to use almost any heat source. ... Read more