We ended up doing water underfloor, overhead just got too much market pushback in the research we did- even if pex looks good on paper.
Even with in row and containment you'll still end up with a couple of CRAC units with compressors and water cooled condensers to maintain humidity, since you'll typically want to run the chilled loop at a non condensing temperature so you don't need to collect condensate at every inrow. Sent from my iPad On Nov 30, 2011, at 11:32, randal k <[email protected]> wrote: Eric, Slab floors and in-row are all the rage these days. With containment, they can be extremely efficient. The biggest upside for us as a public colo facility is being able to build tremendous outside plant up front (water tower, pumps, chillers) and then being able to incrementally add-on targeted in-row cooling as needed. Also, the water-only in row units are dirt cheap (they're a coil+fans, no compressor). It also avoids the inevitable under-floor rats nest - going overhead forces you to plan & use troughs, which makes things easier down the road. Also better on my knees :) We learned our lesson the hard way - investing into a water+glycol solution with DX cooling in each CRAC. More compressors, more maintenance, more expensive CRACs (they have compressors + lot-o-logic :( ... bleh. On the other hand, a lot of folks are wary of overhead water. I'm very interested in everyone's input here as well :-) Randal _______________________________________________ dc-ops mailing list [email protected] https://puck.nether.net/mailman/listinfo/dc-ops
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