[Amps] Getting rid of blower noise - an alternate cooling schemeusing the phase transition of liquid carbon dioxide

[Harold Mandel]

David is entirely correct!

Many of the nuke plants I've worked in use liquid hydrogen on the 
main dynamo. Often these are turning at around 12,000RPM.

Well, men, get the Lithium Hydride out and start your condensing pumps.
A couple of fifty-gallon drums and some tap water will boil up some 
great volumes of H2. All you need do then is to liquefy it with a good
cryostat pump.

Watch out, Hindenburg, hydrogen-cooled amps coming through!
Hal W4HBM


[snip]
You may be surprised that Hydrogen is used as a coolant - often in very 
large alternators such as would be found in a power stations!
David G4FTC
[snip]