back to the issue of cooling

Jim Lux James.P.Lux at jpl.nasa.gov
Tue Apr 22 00:45:23 EDT 2003


It always takes energy to move the heat against temperature differential.
(one of those pesky laws of thermodynamics)

So, to use the waste heat from your cluster to move that heat outside would
require the addition of extra energy.

----- Original Message -----
From: "Mark Hahn" <hahn at physics.mcmaster.ca>
To: "jbassett" <jbassett at blue.weeg.uiowa.edu>
Cc: <beowulf at beowulf.org>
Sent: Monday, April 21, 2003 3:23 PM
Subject: Re: back to the issue of cooling


> > Sorry to keep kicking a dead horse guys, but the issue of increasing
> > thermal efficiency in large clusters and data centers has been keeping
> > me awake at nights.
>
> wow.  you need to get a cluster of your own to worry about ;)
>
> > Has anyone tried to use a stirling engine or other
>
> afaikt, this sort of thing depends on the presence of a substantial
> temperature differential, not just a lot of energy.  my machineroom
> dissipates around 35 KW, but the return air isn't supposed to get
> above about 30C (unlike today, when we hit 35.8 :( )
>
> I have a vague recollection that the efficiency of heat engines is
> strongly dependent on the temp differential, which would be only about 20C
> assuming our chilled water stayed chilled...
>
> > order to recover some of the heat energy that would simply be wasted at
a
> > large facility. Could this be economically viable?
>
> I think it would be more effective to reduce at the source.  for instance,
> my ES40's have 2-of-3 redundant power supplies, which seem to dissipate
> a lot more heat than another cluster which has 1-of-2.  of course, the
mere
> fact that we're using Alphas is a declaration of war on coolness ;)
>
> I hear those Opterons are pretty cool...
>
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