<html><head></head><body bgcolor="#FFFFFF"><div><div>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.</div><div><br></div><div>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.</div>
<br>Sent from my iPad</div><div><br>On Nov 30, 2011, at 11:32, randal k <<a href="mailto:rkohutek+dc@gmail.com">rkohutek+dc@gmail.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">Eric,</span><br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">
<span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">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).</span><br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">
<br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); "><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">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 :)</span><br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">
<br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); "><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">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.</span><br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">
<br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); "><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">On the other hand, a lot of folks are wary of overhead water.</span><br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">
<br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); "><span style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">I'm very interested in everyone's input here as well :-)</span><br style="color: rgb(34, 34, 34); font-family: arial, sans-serif; font-size: 13px; background-color: rgba(255, 255, 255, 0.917969); ">
<font color="#222222" face="arial, sans-serif"><br></font><div><font color="#222222" face="arial, sans-serif">Randal</font></div>
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