×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Data Center Temperature

Data Center Temperature

Data Center Temperature

(OP)
Hey, does a warmer operating data center make you nervous?

We are looking at providing a data center with a 75 degree supply temperature and a 95 leaving temperature from the servers.  This increased temperature difference allows for an HVAC system with a better configuration, but what does that mean for the equipment efficiency?  

www.eypmcf.com

RE: Data Center Temperature

For equipment efficiency, not much. For equipment longevity, cooler is better (unless you're going from 'cooling' to 'refrigeration', in which case things can get worse in real cold too).

Are you talking about 95F return air temperature or exhaust air temperature from the server?

BTW, I would re-post this in forum403: HVAC/R engineering. Computer engineers don't normally design HVAC plants. If you do start a new thread, click the 'Red Flag' button and ask the site admins to delete this one to avoid fragmented discussion.
 

----------------------------------
  
If we learn from our mistakes I'm getting a great education!

RE: Data Center Temperature

(OP)
Yeah, thought I'd get more attention from the Comp Eng group on the air temperature here.  
Good to know that a leaving temp of 95 from the server/room would not be a major problem.  I know that at a certain point elec equipment runs less efficiently due to temp, and it only gets worse as it goes up.  

www.eypmcf.com

RE: Data Center Temperature

75ºF supply seems absurdly HOT for a server room, I think.  

Just make sure your system or the servers never breaks down, because whoever has to spend any time in there will want to come after you.

TTFN

FAQ731-376: Eng-Tips.com Forum Policies

RE: Data Center Temperature

That's because people of yore thought they needed to keep their machines reliable for the long term, since a 10º change can mean up to a factor of 2 degradation in MTBF.  Since server life cycles are probably only a few years, since they'll be absurdly slow compared to newer servers.

Nonetheless, I think 75ºF is too hot to do much in, other than just walking around.  Do any real physical exertion like ripping open a server to swap boards or whatever, and you can build up a goodly amount of sweat.

TTFN

FAQ731-376: Eng-Tips.com Forum Policies

RE: Data Center Temperature

Sheesh, I prefer a room to be in the high 70's for my comfort (77-78 is perfect for me).  When it starts to hit the mid-70's and below it becomes uncomfortable, by the time the high-60's hit my fingers start to cramp.

I would disagree with nwhome's comment about the exhaust temp not mattering.  If I were to pump in 40 degree air and it still comes out 100, I need more efficientcooling.  The intake temp is only partially relevant (relevant only in the sense that it should be somewhat normal, such as 65 degrees and not -30), its the exhaust temp that matters, as that is what tells you (indirectly) the temp of the equipment itself.  If I pump in 70 degree air, but it's coming out at only 80, I would say my equipment is staying reasonably cool... if it comes out at 100, it is really cranking out the heat and is most likely having difficulty transferring much more to the atmosphere giving its current heatsinking capability.

Dan - Owner
http://www.Hi-TecDesigns.com

RE: Data Center Temperature

talking about rack inlet/outlet temps..

I saw this guys presentation at a trade show once and it was pretty informative. He has this method called the rack cooling index.
http://www.ancis.us/images/RCI.pdf


RE: Data Center Temperature

I have always made it a basic rule of thumb that if you feel comfortable in a datacentre, then its too warm. I keep mine at 18 deg C ambiant temp.

Serviced by two ceiling, omni directional A/C units, with forced air venting to the cabinets.

RE: Data Center Temperature

Hmmm this is one that always generates discussion - it is being accepted that data halls are going to get warmer as power densities are getting greater. trying to maintain a set temperature when these densities are getting higher requires more involved cooling methods to be employed.

Im starting to see integral chillers being used and also a move towards water based cooling in the halls themselves. Chilled water being fed into the rack to provide local cooling. Now that is scary, even though they say they are using better designed pipes and couplings and all that I still feel very wary that water is being introduced to a data room. 20kw-40kw in a cabinet is a huge heat load to try and dump to air without letting the temperature creep up.

RE: Data Center Temperature

(OP)
I've been looking at HP's Dynamic Smart cooling.  

Any thoughts on using this to control each rack to what you need or equipment requirements?

www.eypmcf.com

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! Already a Member? Login



News


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close