Hot Air Engine

Hot Air Engine

A hot air engine (historically called an air engine or caloric engine) is any heat engine that uses the expansion and contraction of air under the influence of a temperature change to convert thermal energy into mechanical work. These engines may be based on a number of thermodynamic cycles encompassing both open cycle devices such as those of Sir George Cayley and John Ericsson and the closed cycle engine of Robert Stirling. Hot air engines are distinct from the better known internal combustion based engine and steam engine.

In a typical implementation, air is repeatedly heated and cooled in a cylinder and the resulting expansion and contraction is used to move a piston and produce useful mechanical work.

Read more about Hot Air Engine:  Definition, History, Thermodynamic Cycles

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Hot Air Engine - Thermodynamic Cycles
... A hot air engine thermodynamic cycle can (ideally) be made out of 3 or more processes (typical 4) ... isenthalpic process (the enthalpy is constant) Some examples (not all hot air cycles, as defined above) are as follows Cycle Process 1-2 (Compression) Process 2-3 (Heat Addition) Process 3-4 (Expansio ...
Robert Stirling - Engineering and Science - Hot Air Engine
... efficiency of a variety of industrial processes, obtaining a patent for the economiser and an engine incorporating it in 1816 ... he built the first practical version of his engine, used to pump water from a quarry ... The theoretical basis of Stirling's engine, the Stirling cycle, would not be fully understood until the work of Sadi Carnot (1796–1832) ...
John Ericsson - Hot Air Engine
... to invent independently the caloric, or hot air engine in the 1820s which used hot air, caloric in the scientific parlance of the day, instead of steam as a propellant ... technical priority of invention provides the usual term 'Stirling Engine' for the device ... Ericsson's engine was not initially successful due to the differences in combustion temperatures between Swedish wood and British coal ...

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