Yes a lot of things are perfectly SAFE in this world when they are left by
themselves. Just add an Oxidizer to the reactant and things go totally bad.
Stable Entity: Hydrogen - Oxidizer: Air (21% O2) Hindenberg fire
Stable Entity: Velcro - Oxidizer: O2 Apollo 1 fire
Kinda funny, ANYTHING including steel will burn in presence of O2 but oxygen
is a non-flam gas.
Hydrogen by itself is safe but get ANY OXIDIZER anywhere near it and you are
sending missiles into outer space.
Stable Entity: MAN - Oxidizer: Woman The world is not safe.
OVER.
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of David G4FTC
Sent: Thursday, February 22, 2007 12:24 PM
To: amps@contesting.com
Subject: Re: [Amps] Getting rid of blower noise - an alternate cooling
schemeusing the phase transition of liquid carbon dioxide
>"Harold Mandel" wrote
>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!
>
>
I had a couple of off reflector emails asking me Hydrogen cooling was a
rather early Aprils Fool Joke no its quite serious - for those interested
a Google search on Hydrogen Cooling will yield many references - its
benefits as a coolant in a power station environment are really quite
amazing.
To the uninitiated, the use of hydrogen sounds a little alarming when you
consider that the type of alternators that typically use this cooling
technique could be producing something like 33 kV at 15,000A. But remember
pure Hydrogen is safe, the presence of another gas such as oxygen is needed
for ignition.
AFAIK the hydrogen used to cool alternators is in a gaseous state; Im not
aware of vapour phase cooling being used. Ive only seen it supplied as a
compressed gas from one of the industrial gas suppliers and never seen it
generated on-site, although I suppose theres no reason why it couldnt be.
Lithium Hydride is a new one on me. Personally I would prefer to use
something like Dihydrogen Monoxide http://www.dhmo.org
BTW Im also aware of liquid Sodium being used as a heat transfer medium!
Take Care
David G4FTC
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