[Beowulf] bring back 2012?
sdm900 at gmail.com
Fri Aug 19 09:10:36 PDT 2016
I think direct contact liquid cooling (DCLC)solutions from Asetek and
> CoolIT are much more practical, as are immersion cooling systems using 3M
> Novec engineered fluid. Novec is really appealing because of the heat
> transfer efficiency of the change of state. I believe it was originally
> designed as an electronic parts cleaner, too. It evaporates at room temp
> like other electronic cleaners, so when you pull hardware out the liquid,
> it's dry in a matter of seconds, and very clean, too! Much more practical
> than mineral oil in that regard. 3M claims it has a very low global warming
> factor, too.
> Personally, I think DCLC since any leaks in the data center should be
> smaller than if a tank-like chassis springs a leak, and there one is scared
> of the environmental impact of water, even when antifreeze and other water
> treatment chemicals are added to it, as would be needed in this use case.
2 phase solutions are sexy but ultimately impractical.
* what happens when your recondensing loop fails? and you've evaporated
all the fluid off...
* try and get a permit to hold large volumes of it in a computer room
* try and find a computer room that will allow it in
* the above two are mostly due to the low boiling point of the fluid
* expensive (~ an order of magnitude)
AND you don't actually need a 2 phase solution to get the heat off the
cpu's etc. A single phase solution works just fine.
Dr Stuart Midgley
sdm900 at sdm900.com
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