Hot air engine
External combustion engine using air as the working fluid / From Wikipedia, the free encyclopedia
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A hot air engine[1] (historically called an air engine or caloric engine[2]) 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[3] and John Ericsson[4] and the closed cycle engine of Robert Stirling.[5] 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 are used to move a piston and produce useful mechanical work.