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Old 03-07-2013, 07:20 PM   #11 (permalink)
 
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Re: Ventilation in Hot Area

Without false ceiling i would only have 13 foot, that wouldn't be enough i assume.

Does the below illustration make more sense now?


What happens to the hot air that stays in the ceiling? Do i have to make vents for it to come back to shop and get mixed with the AC?
Should the AC vents be directed to the beds?
Would 9 tons be sufficient?
The AC units are installed above the ceiling. With the hot air from the exhaust going into the ceiling, wouldn't it have any effect on the AC units?
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Old 03-07-2013, 09:05 PM   #12 (permalink)
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Re: Ventilation in Hot Area

I wonder if that false ceiling would choke the beds if they were ran at full capacity with a lack of air flow and/or would it create a fire hazard due to the hi temps.

I over looked the middle east part...here is the US our clients demand around a 22C inside temp with a 30 to 35C outdoor temps. In your area that is always 45C, I think 9 tons of A/C wouldn't be enough to lower the indoor temps from 45C down to ?? (what's normal for your area).

Use the site below to calculate the need for the A/C Tonnage requirements for the building and add 8 Tons for those beds.

BTW, 1 Tons = 12,000 BTU

http://www.calculator.net/btu-calcul...heat&x=82&y=15
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Old 03-08-2013, 05:33 AM   #13 (permalink)
 
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Re: Ventilation in Hot Area

For examples today the temperature is set at 26C (79F) with 50% humidity. While next week its 30C (86F)
This will set to rise slowly from April onwards with June to September witnessing +40C (104F) to 50C (122F). then slowly it goes down as winter approaches to +20C.

The outside corridor is fully air-conditioned 24/7. While the shop windows are are reflective double glazed glasses with a black tint to it to protect maximum heat coming into the shop. Basically the only heat coming into the shop would be mostly generated from the tanning units.

The tanning units won't be running nonstop at full capacity. Probably daily 10-20 times.
3 of the units each generate 3,000m3/h (1,765cfm) heat
while one generates 2,300 m3/h (1,353cfm)
That's a total of 11,300 m3/h (6650cfm) if all are running at same point.

A 5 ton split duct AC with installation would cost with installation around $2700. I've already added this before the ceiling goes on. Once the ceiling is added then it would be tough to add another unit. Is it recommended to add any extra tons or I'm fine with 9 tons now?
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Old 03-08-2013, 07:44 AM   #14 (permalink)
 
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Re: Ventilation in Hot Area

The plenum is 3.1 foot tall by total sq footage so at 1500 sq ft its near 5000 foot.

U do not allow plenum to enter retail space.

Your hvac units draw their air from plenum.
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Old 03-08-2013, 07:58 AM   #15 (permalink)
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Re: Ventilation in Hot Area

When all the units are running you will need a vent in the false ceiling to allow air to flow back down to equalize pressure.
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Old 03-08-2013, 05:04 PM   #16 (permalink)
 
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Re: Ventilation in Hot Area

The above drop is your plenum you draw from that thus air pressure is not a factor.

Also the ceiling tiles and sprinkers and about a billion other small vents throughout the drop ceiling grid will offset any kind of pressure up or down that stuff is not a solid barrier by any stretch.

I think a better question to ask yourself during buildout is what amount of air is normal for that part of world to keep clients comfortable in a regular non tanning application?

Around here a 1500 foot bay will always have 5 ton in it.

Another problem you have is with the setup you have you have to do splits and largest is 5 ton.

They do make the on-wall samsungs at 2.5 ton I have one of them in my electrical room to cool the transformers. Very effective.

If possible mount your transformers in the rafters and not in common areas as folks underestimate the heat produced by a transformer. Better yet boost it outside
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