Hi Stu, The rolling weight is only an issue when moving equipment during installation/removal. It causes point loads and we typically lay steel plate down to spread the load over multiple tiles.
What is your performance density (FLOPS/ft^2) in Houston if you do not mind me asking? Scott On Tue, Mar 10, 2020 at 8:30 PM Stu Midgley <sdm...@gmail.com> wrote: > Immersion cooling makes a lot of sense :) > > We run it on the 21st floor of a building in Kuala Lumpur, on the 1st > floor in Perth and on a slab-on-ground in Houston. > > The tanks+fluid are light. When full of equipment, about 1.2 tonnes > spread over about 2m2. > > In Houston, we have the lowest rated raised floor - since the tanks spread > the load across multiple tiles/floor stands, and there is no rolling weight > (its spread evenly over 2m2) > > So ~ 2200lbs/10sqft ie. about 220lbs/sqft . We run a power density of > 8.5kW/sqm (~800W/sqft) across our whole DC (which includes all the internal > white space/CRAC space etc). > > We cool the whole facility with evaporation (compressor cooling is only > for comfort cooling). > > We have hit a PUE of 1.045 in Houston... and 1.035 in Perth :) > > Come and have a look at our Houston DC :) > > > > On Wed, Mar 11, 2020 at 3:37 AM Scott Atchley <e.scott.atch...@gmail.com> > wrote: > >> Hi everyone, >> >> I am wondering whether immersion cooling makes sense. We are most limited >> by datacenter floor space. We can manage to bring in more power (up to 40 >> MW for Frontier) and install more cooling towers (ditto), but we cannot >> simply add datacenter space. We have asked to build new building and the >> answer has been consistently "No." >> >> Summit is mostly water cooled. Each node has cold plates on the CPUs and >> GPUs. Fans are needed to cool the memory and power supplies and is captured >> by rear-door heart exchangers. It occupies roughly 5,600 ft^2. With 200 PF >> of performance and 14 MW of power, that is 36 TF/ft^2 and 2.5 kW/ft^2. >> >> I am wondering what the comparable performance and power is per square >> foot for the densest, deployed (not theoretical) immersion cooled systems. >> Any ideas? >> >> To make the exercise even more fun, what is the weight per square foot >> for immersion systems? Our data centers have a limit of 250 or 500 >> pounds per square foot. I expect immersion systems to need higher loadings >> than that. >> >> Thanks, >> >> Scott >> _______________________________________________ >> Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing >> To change your subscription (digest mode or unsubscribe) visit >> https://beowulf.org/cgi-bin/mailman/listinfo/beowulf >> > > > -- > Dr Stuart Midgley > sdm...@gmail.com >
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