×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Just primary air for IT room cooling

Just primary air for IT room cooling

Just primary air for IT room cooling

(OP)
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,

RE: Just primary air for IT room cooling

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!

RE: Just primary air for IT room cooling

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

RE: Just primary air for IT room cooling

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.

RE: Just primary air for IT room cooling

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.
 

RE: Just primary air for IT room cooling

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources