Just primary air for IT room cooling

[texanman]

I have been asked why not just duct-in some primary air (55-deg) from the central AHU into an IT room. I have specd out a Liebert, but owner wants to know why? I am looking for advise.
regards,

 

[marcoh]

Because the IT room will have a constant high cooling demand. The adjacent office space will have variable cooling/heating demands, therefore the central AHU will be controlled by the small IT room and potentially over-cool the office or result in significant inefficient reheat. IT rooms also require 24/7 cooling.

Stick to the dedicated IT room Liebert unit as it the right design!

 

[DonPhillips]

Assuming you can control the IT room from the main building air, the best reason is the 24/7 operation. To operate the entire building systems for an IT room outside the, perhaps, 14 hours a day plus 24 hours on each weekend is not very cost effective unless the whole building is 24/7.


Don Phillips

http://worthingtonengineering.com

 

[cry22]

and you could add if I may, future expansion, they keep throwing all kinds of new racks in there every day.
I recall an IT room we designed, the tonnage was absolete by the time it was installed, the load tripled.

 

[KiwiMace]

Sounds like a couple of switches and a patch panel kind of cupboard, but another good reason for a dedicated crac unit is to maintain the humidity spec. Electronics sans people is a dry load which has a high sensible heat ratio, which needs to be matched by the equipment. A normal unit would tend to dry out the space leading to static problems.

 

[texanman]

Thanks Guys, I think now I have good amo to reply to this issue.