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External Combustion Engine

External combustion engines burn fuel outside of the engine. Steam engines are external combustion engines. It is a reciprocating engine wherein a working fluid is contained internally and 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. Then fluid is then dumped or cooled, compressed, and reused. In these type of engines, the combustion is primarily used as a heat source, and the engine can work equally well with other types of heat sources.