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Since 1990 Böhm Stirling-Technik has been manufacturing precision mini-hot-steam engines, the so-called Stirling engines. High-quality materials are used for their production. The engines are assembled manually and are produced in Germany.
Stirling's engine was invented in 1816 by the then 26-year-old Scottish pastor Robert Stirling.
It is a thermal engine in which a liquid or gaseous working body moves in a closed volume, a variant of an external combustion engine. The drift mechanism of the Stirling engine is the thermodynamic process of transforming heat into mechanical. Unlike other types of engines where piston movement is due to combustion of gases, the piston here is driven by the change in volume of constant mass of gases enclosed in a pressurized chamber. This constant mass of gases is expanded thanks to another external heat source (boiler). As a working gas, Stirling's engine can use helium, hydrogen and more. Engine efficiency may reach 40%.
Like the steam engine, the Stirling engine is classified as a variant of an external combustion engine since the heat transfer to and from the working fluid is through a solid medium (heat exchanger) and thus the combustion process and all possible contaminants are isolated from Working parts of the engine. This is not the case in the case of an internal combustion engine where the heat is released in the process of combustion inside the working fluid.
The Böhm models of Stirling engines and kits are inspired by these ideas and show impressively the transformation of heat into kinetic energy.