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[DPRG] Air Conditioning At the Garland Warehouse

Subject: [DPRG] Air Conditioning At the Garland Warehouse
From: Kipton Moravec kip at kdream.com
Date: Sat Jun 4 09:26:44 CDT 2005

Good Job Guys. 

I am not an HVAC person, but you need to make sure you have enough flow
across the AC coils or they will freeze up.  It sometimes happens when
you let your filters get too dirty.

I believe you get the most efficiency with more air moving across the
coils, so more airflow is better. Adding a second or third duct to get
the area to match what is coming in is probably a good idea. Also don't
put the vent near the return. :) 

I am assuming your duct is round. So 14 inch duct has a cross section of
154 Sq Inches. A 10 inch Duct has 79 Sq Inches.  So you need at least
another 10 inch Duct. A 16 inch duct is 201 Sq Inches.  The cheap 8 inch
ducts are only 50 Sq Inches. The extra duct also helps distribute the AC
around the room.

On Sat, 2005-06-04 at 05:26 -0400, DeltaGraph at aol.com wrote:
> Thanks to Mike Dodson, John Drummond and your sometimes humble VP:
> We have Central Air-conditioning at the warehouse now.
> Mike provided the unit which has been in suspended animation for 15
> years.
> John made suggestions on how to blow fire ants out of the relay
> contacts and I think he helped hold a flashlight while we recharged
> the beast last fall.
> This past week we moved the ducting from Mike's Storage room to the
> central meeting area and fired up the unit and it worked pretty well.
> By the end of the evening we even had Dale complaining about how cold
> it was -- and this was after having the doors open for most of the
> evening because John had been busy Charifying hamburgers -- even
> virons could not survive that level of cooking. I mean we could have
> just eaten charcoal out of the bag -- why bother with the meat?  It is
> not my intention to be critical about John's work -- I won't even
> mention the broken tooth.  
> Maybe someone with HVAC experience would know the answer to these
> questions:
> We think the unit is about 2 to 3 tons. I would guess a like a 1000
> CFM blower.  There is only a  single 10" duct coming off the plentium.
> Are we loosing a lot of efficiency by having that small of duct?  My
> little chart from home depot says have like 14" duct for that much
> air-flow. In fact, the return duct is about 14 to 16" come to think of
> it.
> I did not have a thermometer to measure exit air temp. I would assume
> if it is about the same as the evaporator temp we could suck more out
> of the beast?
> I know this info is on the internet somewhere. It gets tiresome to
> type in search phrases and have to read endless web pages.
> I am not sure if the unit will have the capacity to cool the entire
> warehouse. Also, would there be a benefit to constricting airflow to
> get lower temperature exit air if we are trying to pour cold air over
> an area vs air-condition entire space?
> Thanks,
> - Ron  
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Kipton Moravec <kip at kdream.com>

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