Comments on: The Days of Raised Floors are Numbered http://insidehpc.com/2011/02/04/the-days-of-raised-floors-are-numbered/ HPC News Without the Noise for Supercomputing Professionals | insideHPC Fri, 03 May 2013 04:44:25 +0000 hourly 1 http://wordpress.org/?v=3.1.1 By: Mark Hahn http://insidehpc.com/2011/02/04/the-days-of-raised-floors-are-numbered/#comment-302635 Mark Hahn Wed, 09 Feb 2011 04:18:41 +0000 http://insidehpc.com/?p=17089#comment-302635 I was puzzled by the numerous unwarranted assumptions in this article. Why should underfloor spaces necessarily be "filthy"? I know mine isn't, though I plan to pull all the tiles and vacuum when we do a major equipment transition. Another problem is the unsupported claim that hot/cold aisles are somehow less efficient than in-row or in-rack. Why would that be? The big squirrel-cage blowers in a CRAC is quite efficient for the CFM. in-row/rack systems have smaller, less efficient fans and have to make the air flow u-turn. But really, if you're dissipating >15KW, why not go straight to a rack-back heat exchanger and a coolant loop? Is there an implicit assumption here that heat densities are growing (per-socket dissipation is certainly not.) I was puzzled by the numerous unwarranted assumptions in this article. Why should underfloor spaces necessarily be “filthy”? I know mine isn’t, though I plan to pull all the tiles and vacuum when we do a major equipment transition.

Another problem is the unsupported claim that hot/cold aisles are somehow less efficient than in-row or in-rack. Why would that be? The big squirrel-cage blowers in a CRAC is quite efficient for the CFM. in-row/rack systems have smaller, less efficient fans and have to make the air flow u-turn. But really, if you’re dissipating >15KW, why not go straight to a rack-back heat exchanger and a coolant loop? Is there an implicit assumption here that heat densities are growing (per-socket dissipation is certainly not.)

]]> By: Carsten http://insidehpc.com/2011/02/04/the-days-of-raised-floors-are-numbered/#comment-301071 Carsten Fri, 04 Feb 2011 10:39:57 +0000 http://insidehpc.com/?p=17089#comment-301071 Raised floors are still very useful to "hide" the water pipes underneath the racks to feed cold water into these. We use the "under" the floor area solely for water and a little bit of air cooling all cables (mains, network) are fed from the ceiling. Very nice way to separate things. Raised floors are still very useful to “hide” the water pipes underneath the racks to feed cold water into these. We use the “under” the floor area solely for water and a little bit of air cooling all cables (mains, network) are fed from the ceiling. Very nice way to separate things.

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