Re: FreeAxez raised flooring?
We have/are building new datacenters with a raised floor plenum. Air is directed into the racks from below, and ducted out of the top. No hot/cold aisle, just lots of cold air to cool the equipment. It's an AFCO rack design. Seems to be efficient so far.
How do you measure efficiency? How do you blow air on all the computers in the rack and not just the bottom one?
Hot/cold aisles are going to be way more efficient, or at least more uniform. Your systems are probably like most rack mount gear and designed to take air in the front, route it over the internals in an ideal way (possibly using baffles) and spitting it out through the back. Hot/cold aisles work with this system. Your way hits the bottom box and then spits the air out of the rack missing the top systems.
Same way you cool the top of a rack in a cold/hot aisle system. Blow cold air up the front of the rack. We measure temperature at select points in the rack. Keep the hottest spot below set point, and everything is fine. The physics aren't that much different. We are cooling 20kw per rack with this setup. 4 hp c-class chassis per rack. Works great. -- Tim:>
On Fri, Mar 5, 2010 at 10:10 PM, Tim Durack <tdurack@gmail.com> wrote:
Same way you cool the top of a rack in a cold/hot aisle system. Blow cold air up the front of the rack. We measure temperature at select points in the rack. Keep the hottest spot below set point, and everything is fine. The physics aren't that much different.
We are cooling 20kw per rack with this setup. 4 hp c-class chassis per rack. Works great.
Hi Tim, I poked through AFCO's drawings at http://www.afcosystems.com/pdf/AFCO_Drawings.pdf, How much of a size hit is typical? Do you take the depth out to 52" to create enough space in front of the equipment for air to flow and take the 6-inch hit to the side for the cabling sidecar? What's the impact with respect to sharing the facility with non-AFCO cabinets? I would imagine that with a bunch of these things dynamically changing their air flow it would be hard to maintain a static pressure under the floor. Regards, Bill Herrin -- William D. Herrin ................ herrin@dirtside.com bill@herrin.us 3005 Crane Dr. ...................... Web: <http://bill.herrin.us/> Falls Church, VA 22042-3004
On Fri, Mar 5, 2010 at 10:21 PM, William Herrin <bill@herrin.us> wrote:
I poked through AFCO's drawings at http://www.afcosystems.com/pdf/AFCO_Drawings.pdf, How much of a size hit is typical? Do you take the depth out to 52" to create enough space in front of the equipment for air to flow and take the 6-inch hit to the side for the cabling sidecar?
EHD racks with 6" sidecars, one on each side, as we have significant cabling density to handle. Rack frame is 48" deep.
What's the impact with respect to sharing the facility with non-AFCO cabinets? I would imagine that with a bunch of these things dynamically changing their air flow it would be hard to maintain a static pressure under the floor.
No impact - it's all the same racks :-) Airflow under the floor has not been an issue. It's not much different than moving perf tiles around periodically. -- Tim:>
participants (2)
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Tim Durack -
William Herrin