[Beowulf] /. Cooler room or cooler servers?
hahn at physics.mcmaster.ca
Fri Apr 8 09:42:33 PDT 2005
> Water has all sorts of nifty properties -- large heat capacity (relative
> to air), intermediate boiling point, LARGE latent heat of vaporization
water cooling is certainly very attractive to an HPC installation -
even if you're not doing high-density stuff (say, >15 KW/rack),
you've still got obscene amounts of space taken up by airflow
on the other hand, I really don't want 800 water-filled pipes in my
machineroom. putting a heat-exchanger on the front and/or back of each
rack would work (SGI does it, as well as some OTC products.) I don't
think much of the APC sealed-cooled-rack approach, at least not in
a machineroom, in part because they don't seem to understand that
machines are front-to-back. Liebert's top-of-rack boosters seem very
much like a retro-fit solution, to me.
is it possible to make a flexible heatpipe? if there was a sealed
heatpipe that sucked heat off my CPUs, that would make the problem
much easier. perhaps the cold end of such heatpipes could be cooled
by a chilled-water loop (even eth-gly), which wouldn't be as bad
if it had fewer, simpler or factory-configured connectors.
there might be temp-control issues with this approach.
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