Cooling capacity for Server room
Cooling capacity for Server room
(OP)
Most of our clients in high rise building are data call centers and most of them are having a back up A/C units for their server room. What are the necessary data to take when getting the cooling capacity requirements for server room?





RE: Cooling capacity for Server room
I would also look at humidity controls and if they have firewalls that just dissapate the signals they discard
RE: Cooling capacity for Server room
Please explain that?
RE: Cooling capacity for Server room
The tricky part is that IT professionals have very little understand of heat generation. Also, high density servers are getting more and more heat per square foot.
Typically, information from the IT people is fuzzy and they don't know what their long term needs are going to be. I've been seeing loads as high as 9kW per rack, with 30 racks in a small space.
APC and Liebert are manufactuer's with some excellent information on server room cooling design.
RE: Cooling capacity for Server room
RE: Cooling capacity for Server room
If you take the IT equipment nameplate power rating, you can usually derate the total by a diversity factor of 0.8. However, careful in larger facilities that are running heavy calcs or using virtualization to consolidate multiple servers into one, as they often run a bit harder. A normal server will draw 70% of the nameplate just sitting there doing nothing.
There are a lot of best practices in the layout and design of services for critical facilities; ref: ASHRAE TC9.9 material, The Uptime Institute, Green Grid for Form, function, reliability and efficiency. If in doubt, call a critical facility professional. syska.com.
RE: Cooling capacity for Server room
RE: Cooling capacity for Server room
Simply configure the firewall to direct the blocked signals' power to an appropriate inverter and use it to run the air conditioning.
RE: Cooling capacity for Server room
FFS...
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RE: Cooling capacity for Server room
Bill
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Jimmy Carter
RE: Cooling capacity for Server room
RE: Cooling capacity for Server room
RE: Cooling capacity for Server room
IT equipments only generate sensible heat (not latent heat).
Normally, cooling load factor for data center is : 1700-3400BTU/h per m2.
Is there any other opinions ?
RE: Cooling capacity for Server room
You have to press the IT people constantly to understand how their equipment actually operates. They tend to want hugely over-designed systems based on connected load, when in reality there are significant diversities that can be applied.
RE: Cooling capacity for Server room
RE: Cooling capacity for Server room
150W/sf is near the limit for traditional raised floor, downflow floor mounted CRAC units using perf tiles.
Non-Traditional methods (in-row cooling, contained) allow server densities over 1000W/sf.
RE: Cooling capacity for Server room
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Cooling capacity for Server room
Take the "V" out of HVAC and you are left with a HAC(k) job.
RE: Cooling capacity for Server room
Now for whatever load you calculate, keep in mind that the equipment is typically rated for a warmer entering air condition.
Something that will give you say 40 tons of cooling at 80/67 enetering, may only give you 30 tons of cooling when they want the room 68F.
My experience with big server rooms is to have a very high air flow per ton, it is not like you have much to dehumidify with perhaps the exception of fresh air used to pressurize the space in the summer.
Take the "V" out of HVAC and you are left with a HAC(k) job.