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.
800 Naval Air Squadron was a Royal Navy Fleet Air Arm carrier based squadron formed on 3 April 1933 by amalgamating No's 402 and 404 (Fleet Fighter ...
... 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 ...
... 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) ...
... 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 ...
Famous quotes containing the words engine, hot and/or air:
“Industrial mana sentient reciprocating engine having a fluctuating output, coupled to an iron wheel revolving with uniform velocity. And then we wonder why this should be the golden age of revolution and mental derangement.”
—Aldous Huxley (18941963)
“But the hot hell that always in him burns,
Though in mid Heaven, soon ended his delight,
And tortures him now more, the more he sees
Of pleasure not for him ordained. Then soon
Fierce hate he recollects, and all his thoughts
Of mischief, gratulating, thus excites:”
—John Milton (16081674)
“He who wishes to teach us a truth should not tell it to us, but simply suggest it with a brief gesture, a gesture which starts an ideal trajectory in the air along which we glide until we find ourselves at the feet of the new truth.”
—José Ortega Y Gasset (18831955)