External and internal heat engines differ in where heat transfer occurs, affecting efficiency and design.
An external heat engine differs from an internal heat engine in terms of where the heat transfer occurs. In an external heat engine, the combustion or heat transfer happens outside of the working fluid chamber, whereas in an internal heat engine, the combustion or heat transfer happens inside the working fluid chamber.
For example, a Stirling engine is an external heat engine that operates by heating and cooling an enclosed working fluid externally, while an internal combustion engine uses a hot gas-air mixture inside the engine to generate power internally.
Overall, the distinction lies in how and where the heat transfer takes place within the engine, influencing their efficiency and design.
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