[dc-ops] General opinions about AC cooling..

[Matt Addison]

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 <rkohutek+dc at gmail.com> 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

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