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
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