Pros and cons of under the floor a/c in a data center?

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What are the benefits/cons to under the floor a/c in a data center?

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By “under the floor a/c”, I assume you mean a raised floor with the cold air underneath and supplying the computer room via grates and perforated floor tiles?

If so, a few of the advantages are:
(1) if you want to install 60′s/70′s era mainframes, you’ll be all set.
(2) Your data center will fit the model of what most people think of a computer room should look like.
(3) There is a tremendous amount of expertise available to design & build them.
(4) You’ll be helping to support the economy by purchasing plentum-rated cabling, underfloor fire-detection and suppression systems, floor-cutout sealing grommets, perf tiles and/or grates, 50-year-old CRAC designs, floor support systems, higher construction costs, etc…
(5) You can learn to cut cable-cutouts in floor-tiles, and learn to move tiles around as cooling requirements change.
(6) You can proudly point out you’ve built a “Modern Legacy Data Center”.
(7) You won’t have to explain why you don’t have underfloor cooling, or in some cases — even a raised floor at all.

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  • Batman47
    Typical Data Centers these days need much more cooling than just under the floor. I suggest you still use something for that, like a 5 ton with perforated tiles, otherwise you will get a 'dead rat' smell from lack of circulation. For most of your cooling it should come from above with cold isle containment.
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  • StevenG7
    Properly designed, both "cold" and "hot" isle containment systems work well. Most (but not all) cold-isle containment systems require raised floors (with the disadvantages I mentioned earlier); most hot-isle systems don't. There may be other reasons to favor one over the other, I've save that for another discussion. As Batman47 points out, cooling doesn't need to come from below -- it can also come from above, or from the sides (in-row). Each has its own advantages and disadvantages, and there is really no one "best" solution -- there is only what is best for *your* particular set of circumstances. But whatever path you choose, the one clear win is some sort of containment system.
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  • NewnanIT
    [...] Anyone else have pros and cons of under the floor a/c in a data center to add to StevenG7 and Batman47’s [...]
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