I have a meager DC with 4 racks (2 7014's and 2 hp9000 recycled for
telephone and network duties).
Leaving the back door on one of the 7014's raised the BladeCenters input
2°C vs leaving it open, (ok, that rack has 2 SUN machines and those put
heat out like an oven). I'm trying to close all the floor gaps and get some
fans to try and direct the heat out of the racks and into the AC's...
Is there a good place to read all the best practices for a DC? i've found
some documents but nothing really complete...

On Thu, Jan 30, 2014 at 4:34 PM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

Good data centers strictly enforce Hot aisle Cold aisle. Then they also
verify air flow on switches and routers etc move in the correct
direction and that all spaces are filled. If some stuff blows heat
forward and other rearward that can create a 'heat loop' that then
overheats both pieces.

We see many rooms where fans are running blowing air all over. Mostly
this is bad because it simply homogenizes the air mixing the hot and the
cold. Thus the available air to cool the servers is warmer than it could
be and the air going to the CRAC is cooler than it could be. Thus heat
removal is not as effective as it could be.

For facilities with raised floor it's important to remove old tapes,
manuals, cables and other 'crud' from below the floor. Also plug holes
that allow cold air to escape where it should not with pillows or
brushes. Place vented tiles where it will direct the cool air to the
Front (INTAKE side) of the equipment. Do not allow ANY cold air to reach
the outlet (hot) side of the racks. Remember the goal is not to put cold
in, it's to get HOT(Heat) out. If possible place return air ducts above
the hot side of the racks allowing the hottest air to get to the CRAC.

It's pretty amazing how much more efficient CRAC is when air-flow is

The 'magic heat gun' looks so awesome that I already ordered one. :-)

- Larry "DrFranken" Bolhuis


On 1/30/2014 9:15 AM, rob@xxxxxxxxx wrote:

Man, one of those laser temperature guns like below:

Really shows you where your computer room hot spots are.

I really think it would be more efficient if we ducted our racks.

I should probably also be concerned that the breaker boxes on the loading
dock shows a few breakers well over 80o when the ambient temperature
surrounding them is under 60o.
These breakers control HVAC units on the roof. Another concern about
these is that when they blow they don't blow their individual breaker.
They blow the breaker which feeds their breaker box. Which also happens
to feed our computer room UPS. See my concern?
This breaker is a special one you will never see in a home application.

Rob Berendt

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