On Tue, Nov 26, 2013 at 4:28 PM, Eugen Leitl <eu...@leitl.org> wrote: > This is one of 3M Fluorinerts (not at all cheap), so there is phase change > enthalpy as the liquid boils -- I presume there is a heat exchanger at the > top where it condenses, and drips down again.
Indeed, this is how it should work at a macroscopic scale. I was thinking more at the microscopic scale - when the bubble forms, the heat transfer becomes suddenly much worse locally and only a fast convection (and therefore moving of the bubble) avoids a hotspot. I think that this was a problem previously with viscous (oil-like) liquids, as the bubbles were not moving fast enough. > The ASIC-bearing boards are vertical, so there should be considerable > bubble-assisted convection. If the boards are too high and placed too close to one another, there is a risk of getting a too high ratio of bubbles to liquid, in which case the overall heat transport doesn't work as planned. In the pic it seems like the whole liquid is bubbling... > The reason why I posted it is that these guys obviously expect to > recover the expense of building and operating the data center by way > of mined Bitcoins. Not sure it will turn out as planned. Well, this report (as many others like it) only works to increase the hype around Bitcoins - which leads to a higher value :) Cheers, Bogdan _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
