The Stirling engine is an external combustion, closed-cycle heat engine that transforms thermal energy into mechanical work through the cyclic expansion and contraction of a working gas. Invented in 1816 by Robert Stirling, it was designed as a safer alternative to high-pressure steam engines of the era.
A Beginner's Guide to Stirling Engines : 8 Steps (with Pictures) Stirling Engine : A Beginners Guide
A displacer piston moves the gas to the cold side of the engine, where it cools and contracts. The Stirling engine is an external combustion, closed-cycle
The engine operates on a temperature difference between two zones: a and a cold sink . Stirling Engine : A Beginners Guide