Re: FreeAxez raised flooring?

[david raistrick <drais () icantclick org>]

On Fri, 5 Mar 2010, Dorn Hetzel wrote:

> What is the purpose of raised flooring if it *doesn't *create a plenum?

...cabling?  (though I think working under a floor to route cables vs 
overhead ladder is a pain..but mixing cabling AND air underfloor is much 
worse)


> On Fri, Mar 5, 2010 at 10:39 AM, Jason Gurtz <jasongurtz () npumail com> wrote:

> > How would cooling be done in this scenario?  Open air (with intake/exhaust
> > mixing) seems like a step backwards in terms of efficiency.

The usual methods of overhead (or possibly underfloor if you have enough 
height) distribution:  Ductwork. :)

Feed cold air into your cold aisle, and depending on your density and 
ceiling height use a general hot air return that pulls from the top of the 
ceiling (likely the same way you're used to seeing it done for most raised 
floor installs) OR drop additional hot air returns right over your hot 
aisles.


Further hot/cold seperation is entirely possible, too, to support higher 
densities...


Personally I'm not a fan of using raised floor for a cold air plenum for 
reasons I'm not inclined to go into right now. :)


--
david raistrick        http://www.netmeister.org/news/learn2quote.html
drais () icantclick org             http://www.expita.com/nomime.html