[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: DATACENTER: Datacenter HVAC requirements

Jason,

The typical quick calc goes something like this:

[(Qty of servers)*(watts load per server)*(3.413 BTU/watt)] / [12,000 BTU
per Ton of cooling] = Tons of cooling

Of course, there are the wildcards thrown in like system component
efficiencies, altitude, maximum degree day temperatures, shading coefficient
for outside equipment, water-cooled versus air-cooled, etc. that usually
require a mechanical engineer to look at the total package.  But, from an
electrical-to-heat conversion standpoint, disregarding the above-mentioned
wildcards, the formula will get you into the right ballpark.

A real neat idea --- and one that really helps out the engineers that have
to try and make this work for you --- is to put together a matrix of all the
electronic equipment you plan to have, or do now have, in your data center,
with all of the environmental and electrical engineering data needed to
completely facilitize your center.  This matrix then becomes your basis of
design for the engineers to properly and efficiently do their jobs.

As a planning tool, I am seeing and using a beginning factor today of 3.0 KW
per 84" tall server rack.  This is independent of the end use of the rack,
whether server farm or collocation space.

If you need more, feel free to write me ...

Dan


-----Original Message-----
From:	[email protected]
[mailto:[email protected]] On Behalf Of Jason Emery
Sent:	Friday, June 25, 1999 11:38 AM
To:	[email protected]
Subject:	RE: DATACENTER: Datacenter HVAC requirements

What about humidity in the datacenter? How important is control of that
considering the cost? Is it easy or hard? What can happen if humidity isn't
controlled? Thanks,

Jason Emery



		-----Original Message-----
		From:	Mark Smith [mailto:[email protected]]
		Sent:	Monday, June 14, 1999 4:36 PM
		To:	[email protected]
		Subject:	DATACENTER: Datacenter HVAC requirements


		Ok, so if I look in my cool little master converter program
it tells me
		that 1 watt = 3.4120962 BTU/hr. So my questions is how much
cooling do
		I need for my datacenter? Is it as simple as:

		# racks * 20 amps a rack * 3.4120962 / 12,000 (BTUs in a
ton) = tons of
		HVAC required?

		P.S. Most datacenters provide 20 amps AC a rack, but what
about DC?

		-Mark

		_________________________________________________________
		Do You Yahoo!?
		Get your free @yahoo.com address at http://mail.yahoo.com