[Beowulf] HVAC and room cooling...

Daniel Pfenniger daniel.pfenniger at obs.unige.ch
Sat Jan 31 12:40:33 EST 2004

John Hearns wrote:
> On Fri, 30 Jan 2004, A.J. Rossini wrote:

>>to people that it isn't possible, but someone brought up "portable
>>liquid nitrogen" -- for the room, NOT for overclocking -- I'm trying
>>to get stable systems, not instability :-).
> Daft idea.
> What happens when the liquid nitrogen vapourises? It turns to nitrogen 
> gas. And if you are unlucky anyone in the room chokes...
> I was reminded of this in the lift of a chemistry department where
> we have an opteron cluster - a large sign reminding that LNO2 and 
> dangerous chemicals are not allowed in passenger lifts.

When liquid N2 vaporizes in a closed room the natural fraction of N2 in 
air, already 78% by volume, just increases.  N2 is thus not toxic, the 
only risk by increasing N2 volume is to reach a too low O2 concentration
for mammals beings breathing in the room.

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