On Wed, Mar 14, 2012 at 08:12:47PM -0700, Lux, Jim (337C) wrote: > The Cray-2 used Fluorinert(tm) FC-74 as the coolant, which is very nice to > work with, although expensive.
I've worked with a few 3M fluorinerts for blood substitutes (nothing kills quite like liberated fluoride during sonickating) and for cooling/partial liquid ventilation purposes. Heavy stuff, twice the density of water. Seems to do havoc to your immune system at long-term exposures. > It doesn't wet things very well, so when you pull something out of the > bath, it doesn't bring much fluid with it. The Cray used it as a heat > transfer medium to water coolant. I think they had a way to drain it into > a tank quickly for servicing. > > > It can be used for ebullient (boiling) cooling by picking the right vapor > pressure/BP grade (the Cray didn't use this). Ebullient cooling is quite The Cray X1 used evaporative spray cooling at least http://www.cse.ohio-state.edu/~panda/875/class_slides/cray-jaguar.pdf > efficient at moving the heat away because it's a phase change, and the > bubbling causes good circulation, but it does require careful design so > you don't get film boiling/Leidenfrost effect (the phenomenon that > protects your feet when walking across burning coals barefoot) There's a K/Na eutectic which is cheap (unlike Ga eutectics) and is liquid at RT. Extreme fire hazard if you'll get a leak in air, though. _______________________________________________ Beowulf mailing list, [email protected] sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
