Slightly OT: Calculating HVAC requirements for server rooms
joel.mercado at verizon.net
joel.mercado at verizon.net
Sat May 2 13:25:30 UTC 2009
In modern data Centers drop ceiling is installed. The reason being you
can create a AIR plenum. If your not going to have a air plenum then
you should not have a drop ceiling. If you look at the in the link
below you will see were the red arrows are thats were you would
installed drop ceiling perferated tiles. Then the crack you will have a
housing that sits ontop of the crack unit connected the ceiling to it
and pulls air in.
[1]http://www.panduit.com/stellent/groups/marketing-corp/documents/land
ing_pages/~export/CMSCONT_034718~13/34864-5.gif
Jmercado
May 2, 2009 06:53:16 AM, [2]jbates at brightok.net wrote:
William Herrin wrote:
> You shouldn't even *have* a drop ceiling in a modern computer
room.
> You want the room to be as tall as practical so that the air from
the
> hot aisles has somewhere to go on its way back to the HVAC, other
than
> back through and around the cabinets.
>
I love my 30' ceiling. Even with all the things that are wrong with
our
HVAC setup, the servers survive due to that ceiling.
> Personally, I've found that there's a pretty wide disparity
between
> HVAC professionals that are capable of hooking up a CRAC and
turning
> it on versus HVAC professionals that understand the holistic
picture
> including hot aisles, cold aisles, humidity control and flow. I
> wouldn't want to call in a professional without first
understanding
> the problem well enough to assess whether I was getting a
competent
> answer.
I had this issue. They hooked up the redundant systems, but didn't
bother with much else. The return feed is below the units pulling
ambient air, and the cold air is injected 15+ feet above the isle
behind
the servers, intermixing with the hot air as it rises up the wall.
At least it works, but it could be better and changes will need to
be
made before I can reach 50% capacity in the racks.
Jack
References
1. http://www.panduit.com/stellent/groups/marketing-corp/documents/landing_pages/~export/CMSCONT_034718~13/34864-5.gif
2. mailto:jbates at brightok.net
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