An air engine or air motor is a device for converting potential energy from compressed air into kinetic energy to drive other machines. As in a steam engine, expansion of externally supplied pressurized gas performs work against one or more pistons or rotors to move wheels or other tools.The most recent development uses pressurized air as fuel in an engine invented by Guy Nègre, a French engineer. A similar concept is currently being developed by Uruguayan engineer Armando Regusci, AustralianAngelo Di Pietro, South Korea Chul-Seung Cho, and more recently, Kernelys' K'Airmobiles Compressed air vehicles. Despite interest in the technology, no company has yet put a vehicle using this technology into mass production. A successful vehicle would offer many of the advantages of a battery electric vehicle without the need for heavy and potentially toxic batteries, which take hours to recharge instead of the few minutes required to refill the tanks for an air engine.
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Hot air engine
hot air engine (historically simply 'air engine' or 'caloric engine') is a catch-all term for any heat engine which uses the expansion and contraction of air under the influence of a temperature change to convert thermal energy into mechanical work. It includes closed cycle devices such as the Stirling engine, thermoacoustic hot air engine and open cycle devices such as those devised by Sir George Cayley and John Ericsson. Its use is sometimes extended to describe engines employing other permanent gasses as their working fluid, but specifically excludes any engine performing a thermodynamic cycle such as the Rankine cycle, in which the working fluid undergoes a phase change. Also excluded are conventional internal combustion engines in which heat is added to the working fluid by combustion of fuel within the working cylinder - continuous combustion types such as George Brayton's Ready Motor and the related gas turbine could be seen as borderline cases.
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