In the Stirling engine, a gas is heated and expanded by energy supplied from outside the engine's interior space (cylinder). Strictly speaking, the inclusion of the regenerator is what differentiates a Stirling engine from other closed-cycle hot air engines. Regenerative describes the use of a specific type of internal heat exchanger and thermal store, known as the regenerator. Closed-cycle, in this context, means a thermodynamic system in which the working fluid is permanently contained within the system. More specifically, the Stirling engine is a closed-cycle regenerative heat engine, with a permanent gaseous working fluid. ![]() The heat source (not shown) would be placed under the brass cylinder.Ī Stirling engine is a heat engine that is operated by the cyclic compression and expansion of air or other gas (the working fluid) between different temperatures, resulting in a net conversion of heat energy to mechanical work. Unlike the steam engine or internal combustion engine, it has no valves or timing train. ![]() A model of a Stirling engine showing its simplicity.
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