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Posted by Joseph on March 4, 2007, 8:36 pm
>
> >
> > Interesting idea Marc, congrats on being published. I have been
> > having trouble getting a couple of server rooms to
> > keep up with the growing loads being added to the racks (not large
> > enclosed racks though). I am wondering do think this
> > principle could be applied to an open rack sever room? Also would some
> > conversion give a strained system a little more
> > capacity? Funny thing is even though the loads have gone up the icing
> > issues haven't disappeared.
> >
> > Joseph
> >
> >
>
> It's trying to get people to get away from thinking that server rooms must >
be kept at a constant 18 deg'c throughout
the room.
Most of the server rooms I work on are set at 68/69*F. The couple rooms
that are having trouble (icing minisplits)
are set at 71*F.
Last week I was called out to an iced unit. 3 or 4 ceiling tiles had been
taken out and not replaced. Unit head
was 12" or from the open attic, replaced tiles, unit hasn't re-iced.
> The idea of the chiller
> strips is to stop the hot air from mixing with the room air before it
> returns to the conditioner. It's best to think of the warm air out side of
> the server racks as the start of the return duct and design from there.
>
> Correctly ducted the 'air on' will be 30+deg'c and therefore will hold more
> heat to help prevent coil freezing and save energy by not allowing it to mix
> with air that's just been cooled. This method will also increase the
> performance of the existing equipment by supplying cool air to where it's
> best needed -i.e. the air intake side of the servers and not where it's not.
>
> The big problem is converting conventional rooms to this configuration....
>
> Personally I would have liked the r/h diag to have the return in the centre
> and the cold to the outside. (as per chiller strip picture) Then draw the
> chiller strips in for a better explaination of the design. However I know
> that the articles are sub'ed heavily and time isn't always available..
Most of the server fans I see blow out the back of the rack. My problem
will be airflow from the minisplit heads
that are wall mount, not ducted. Small server rooms, with growing heatloads. I
have the go ahead to change one out to
catch up with demand. Have to give it some thought, might be worth looking at
for an upgrade.
Joseph
>
>
>
> Cheers
> Richard
>
>
>
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