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Regenerative cooling

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From Wikipedia, the free encyclopedia

Technique for cooling gases

For regenerative cooling in rockets, seeRegenerative cooling (rocketry).

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The classicalCarnot heat engine

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Specific heat capacity

c=

$T {\displaystyle T}$	$\partial S$
$N {\displaystyle N}$	$\partial T$

Compressibility

\beta =-

$1 {\displaystyle 1}$	$\partial V$
$V {\displaystyle V}$	$\partial p$

Thermal expansion

\alpha =

$1 {\displaystyle 1}$	$\partial V$
$V {\displaystyle V}$	$\partial T$

Equations

Potentials

Internal energy
$U(S,V)$
Enthalpy
$H(S,p)=U+pV$
Helmholtz free energy
$A(T,V)=U-TS$
Gibbs free energy
$G(T,p)=H-TS$

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Regenerative cooling is a method ofcooling gases in which compressed gas is cooled by allowing it to expand and thereby take heat from the surroundings. The cooled expanded gas then passes through aheat exchanger where it cools the incoming compressed gas.^[1]

Regenerative cycles

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History

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In 1857, Siemens introduced the regenerative cooling concept with theSiemens cycle.^[2] In 1895,William Hampson in England^[3] andCarl von Linde in Germany^[4] independently developed and patented theHampson–Linde cycle to liquefy air using theJoule–Thomson expansion process and regenerative cooling.^[5] On 10 May 1898,James Dewar used regenerative cooling to become the first to staticallyliquefy hydrogen.

References

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^"Cryogenic microcooling Pag.25"(PDF). Archived fromthe original(PDF) on 2012-02-18. Retrieved2008-11-06.
^Charles William Siemens, "Improvements in refrigerating and producing ice, and in apparatus or machinery for that purpose", British patent no. 2064 (filed: July 29, 1857).
^W. Hampson, "Improvements relating to the progressive refrigerating of gases", British patent 10,165 (filed: May 23, 1895).
^Linde, Carl, "Verfahren zur Verflüssigung atmosphärischer Luft oder anderer Gase" (Method for the liquefication of atmospheric air or other gases), German patent 88,824 (filed: June 5, 1895).
^Hydrogen through the Nineteenth Century

External links

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Regenerative Coolers Archived 2007-07-17 at theWayback Machine
Regenerative Cycle Video

Thermodynamic cycles

External
combustion / thermal

Without phase change (hot air engines)	Bell Coleman Brayton/Joule Carnot Ericsson Stirling Stirling (pseudo/adiabatic) Stoddard Manson
With phase change	Kalina Hygroscopic Rankine (Organic Rankine) Regenerative