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

[Colin Lamb]

The jury is still out on the actual cause of the Hindenburg fire.  No doubt Hydrogen was a major participant, but there may have been other factors.  Prior to the final event, the Hindenburg had been struck by lightning on a number of occasions without any bad effects.  Some claimed that the thermite paint may have caused the explosion, although that theory has been generally discredited.  Perhaps the most surprising fact was that the passenger compartments were inside the Hindenburg (not in the gondola) and the passengers that remained inside the Hindenburg and rode it to the ground all survived without injury.  Most of the deaths were from jumping.  

The latest theory is that the Hindenburg had just previously exceeded the red line speed in bad weather and suffered fatal structural failure.  That entire structure was failing at Lakehurst and that failure allowed the gas enclosure to rupture and the gas, when combined with oxygen became flamable.  This escaping gas was ignited by lightning.

The Hindenburg had flown hundreds of thousands of miles prior to the disaster with no problems.  In the end, the disaster was similar to other aircraft disasters - the pilot exceeded the limitations set by the designer.  

Colin K7FM  

        



-----Original Message-----
>From: "Robert B. Bonner" <rbonner at qro.com>
>Sent: Feb 22, 2007 10:39 AM
>To: 'David G4FTC' <g4ftc at hotmail.com>, amps at contesting.com
>Subject: Re: [Amps] Getting rid of blower noise - an alternate cooling	schemeusing the phase transition of liquid carbon dioxide
>
>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 at contesting.com [mailto:amps-bounces at contesting.com] On
>Behalf Of David G4FTC
>Sent: Thursday, February 22, 2007 12:24 PM
>To: amps at 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
>
>_________________________________________________________________
>MSN Hotmail is evolving  check out the new Windows Live Mail 
>http://ideas.live.com
>
>
>
>_______________________________________________
>Amps mailing list
>Amps at contesting.com
>http://lists.contesting.com/mailman/listinfo/amps