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Application Tips for Mini Splits in Server Rooms

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Subject Author Date
Application Tips for Mini Splits in Server Rooms Marc O'Brien 03-03-2007
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Posted by on March 4, 2007, 8:24 pm
wrote:

>People, if you don't yet subscribe to the UK's RAC magazine then
>here's a good reason why you should. They publish my articles in the
>associated RAC Service Engineer Magazine. Of course this argument can
>be substantiated - everyone should read my articles and we all doubt
>anyone would disagree.
>
>Thoughts on better application of mini splits in server rooms. It has
>only been out a few days but already I've received a hand full of
>phone calls from suppliers and contractors wanting to discuss the
>principles further.
>
>The link is to a low resolution scan of the most recent issue's
>article.
>
>http://www.hvacrforums.com/uploads/design/closecontrol/rac_se_spring_2007.htm
>
>Let me know what you think.

        This is right up your alley -

Get this free coil selection software

http://www.colmaccoil.com/coilsoft.asp

and see what size coil you need to run 50 F CHW ( IOW just above
dewpoint at targetted aisle temp of 68 F, 50 RH leaving ) with
minimal or no airflow, and what capacities you can get for what coil
size.

Then picture the cold aisle being 'roofed', so to speak, with coil.
Rack-to-rack, overhead. Just sitting there dropping cold air by
natural convection, plus the pull created by the server fans ( that
are gonna run no matter what ). Could be interesting.




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AppliancePartsPros.com, Inc.
Posted by New Directions In Building Ser on March 6, 2007, 2:05 am
Don't really like minisplits protecting Electronic Equipment (incl LAN)
Rooms as the quality of the units is usually not reliable enough and if
someone's such a cheapskate that they'd use a minisplit on a 100% sensible
load then they're probably too cheap to build in any redundancy. Unless
these minisplits are high quality and high airchange rate units.

You want to stop icing, vapour seal the room. I mean Joseph - what's this
about ceiling tiles. Glue the bastards up seal all the holes (and get some
of that stuff that gives birds a hotfoot to identify and inhibit the
culprits), put double strip rubber seals on the doors and paint every
surface of the fabric with acrylic. then no ice. Anybody that wants to stuff
things up... just set the room setpoint below 20 degrees (you increase the
risk of drying out the room as the coil strips more moisture over time and
elevate humidifier running, you also increase the risk of short cycling and
increase the risk of failure).

Given all that Marc's idea does have merit for some applications (cheapskate
customers) but as for the pomy "Service Engineer" subscription, I think that
I prefer to invest my subscription money in the Chartered Instutute of
Building Services Engineers Journal (another pomy publication) and our local
Australian Institute of Heating & Refrigeration Engineers Journal, the
Institute of Plant Engineers of Australasia Journal and Climate Control
News.



Posted by r.bartlett on March 6, 2007, 2:43 am

> Don't really like minisplits protecting Electronic Equipment (incl LAN)
> Rooms as the quality of the units is usually not reliable enough and if
> someone's such a cheapskate that they'd use a minisplit on a 100% sensible
> load then they're probably too cheap to build in any redundancy. Unless
> these minisplits are high quality and high airchange rate units.
>
> You want to stop icing, vapour seal the room. I mean Joseph - what's this
> about ceiling tiles. Glue the bastards up seal all the holes (and get some
> of that stuff that gives birds a hotfoot to identify and inhibit the
> culprits), put double strip rubber seals on the doors and paint every
> surface of the fabric with acrylic. then no ice. Anybody that wants to
> stuff things up... just set the room setpoint below 20 degrees (you
> increase the risk of drying out the room as the coil strips more moisture
> over time and elevate humidifier running, you also increase the risk of
> short cycling and increase the risk of failure).
>
> Given all that Marc's idea does have merit for some applications
> (cheapskate customers) but as for the pomy "Service Engineer"
> subscription, I think that I prefer to invest my subscription money in the
> Chartered Instutute of Building Services Engineers Journal (another pomy
> publication) and our local Australian Institute of Heating & Refrigeration
> Engineers Journal, the Institute of Plant Engineers of Australasia Journal
> and Climate Control News.

The hot isle cold isle server farm room solution is a well researched idea,
so I'm surprised you haven't heard of it.?

http://www.prc.gatech.edu/academics/pre-college/2005/presentations/Air%20Flow%20Rates%20in%20Server%20Farms.pdf

http://www.dataclean.com/pdf/AlternColdnew.pdf

http://www.chatsworth.com/uploads/pdf/DUCTED_EXHAUST_BEYOND_HOTCOLD_WP.pdf

So actually it's not the a cheapskate option but is a much better system to
ensure correct airflow through the server cabinet. The fact that it leads to
a better utilisation of the cooling duty (and hence lower energy costs)
should be aplauded too.

Cheers

Richard

P.S 'Service Engineer' is a 4 x per year free issue from the people who
produce R&A.C magazine.



Posted by Marc O'Brien on March 6, 2007, 2:33 pm
> The hot isle cold isle server farm room solution is a well researched idea,
> so I'm surprised you haven't heard of it.?
>
> http://www.prc.gatech.edu/academics/pre-college/2005/presentations/Ai...
>
> http://www.dataclean.com/pdf/AlternColdnew.pdf
>
> http://www.chatsworth.com/uploads/pdf/DUCTED_EXHAUST_BEYOND_HOTCOLD_W...
>
> So actually it's not the a cheapskate option but is a much better system to
> ensure correct airflow through the server cabinet. The fact that it leads to
> a better utilisation of the cooling duty (and hence lower energy costs)
> should be aplauded too.

http://www.apc.com/prod_docs/results.cfm?class=wp&ncpi_child=%25&ncpi_parent=Cooling



Posted by Abby Normal on March 10, 2007, 12:21 pm
> People, if you don't yet subscribe to the UK's RAC magazine then
> here's a good reason why you should. They publish my articles in the
> associated RAC Service Engineer Magazine. Of course this argument can
> be substantiated - everyone should read my articles and we all doubt
> anyone would disagree.
>
> Thoughts on better application of mini splits in server rooms. It has
> only been out a few days but already I've received a hand full of
> phone calls from suppliers and contractors wanting to discuss the
> principles further.
>
> The link is to a low resolution scan of the most recent issue's
> article.
>
> http://www.hvacrforums.com/uploads/design/closecontrol/rac_se_spring_...
>
> Let me know what you think.

I am still stubborn, I vote for high airflow and an oversized fan coil


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