[Gllug] Body lotion

John Hearns hearnsj at googlemail.com
Thu Jul 22 06:30:29 UTC 2010

On 22 July 2010 00:24, Nix <nix at esperi.org.uk> wrote:
> On 21 Jul 2010, John Hearns said:

>> Wow - I was right. Toothpaste is a good thermal compound.
> ITYM 'water is a good thermal compound'. (Probably mostly for the same
> reason: high shc and evaporative cooling. OK, so the latter makes both
> toothpaste and water a really bad thermal compound, but they're good at
> *heat transfer*.)

Indeed. There are systems which use water cooling via microchannels
across a heatsink.
I don't have a reference handy.

At Imperial College as far as I know they have a liquid CO2 cooling
system - but that's rack doors, rather than direct contact to
heatsinks (Google for 'Trox').

Regarding temperature monitoring, I have Ganglia graphs of system air
temperatures on a cluster,  sampled every ten minutes. Systems will
email me if it gets a bit hot, and will shut themselves down if it
gets too toasty.
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