External combustion engine
HEAT ENGINE DRIVEN BY COMBUSTION IN AN EXTERNAL SOURCE
External combustion engines; External-combustion engine; External combustion; External Combustion Engine
An external combustion engine (EC engine) is a reciprocating heat engine where a working fluid, contained internally, is heated by combustion in an external source, through the engine wall or a heat exchanger. The fluid then, by expanding and acting on the mechanism of the engine, produces motion and usable work.