On 12/28/11 11:00 AM, "Vincent Diepeveen" <d...@xs4all.nl> wrote:
>Yeah Jim good comments, > >I was thinking for my cluster to overclock, which is why i guess some >posted the overclocking sentences, >and wanted to do it a bit more cheapskate. > >Latest idea now was to save costs by using for say a node or 16, >to order 16 cpu blocks and 16 small pumps and 2 cheap big reservoirs: > >Coldreservoir ==> 16 minipumps ==> 16 cpu blocks ==> Hotreservoir Hmm.. Over the past few years I've been trying different schemes to keep a bunch (a cluster?) of glass bottles full of 750ml of an 12-15% alcohol solution in water at a reasonable temperature (15C or thereabouts), and I've gone through a wide variety of improvised schemes. (aside from buying a purpose built refrigerator.. Where's the fun in that?) Unless you need small size with high power density, very quiet operation, or sealed cases, BY FAR the easiest way is a conventional air conditioner blowing cold air through the system. Schemes with pumps and radiators and heat exchangers of one kind or another have maintenance and unexpected problems (stuff grows in almost any liquid, metals corrode, pumps fail, plastics degrade). A very inexpensive window airconditioner (US$99, 8000 BTU/hr = 2400 Watts) draws about 500-800 Watts (depending on mfr etc). The Coefficient of Performance (COP) of these things is terrible, but still, you ARE pumping more heat out than electricity you're putting in. A "split system" would put the noisy part outside and the cold part inside. The other strategy... Get a surplus laboratory chiller. Put THAT outside and run your insulated cold water tubes down to a radiator/heat exchanger in your computer box. At least the lab chiller already has the pumps and packaging put together. Run a suitable mix of commercial antifreeze and water (which will include various corrosion inhibitors, etc.) But really, cold air cooling is by far and away the easiest, most trouble free way to do things, unless it just won't work for some other reason. > _______________________________________________ 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
