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Air-cooled Sealed Room HVAC, Dehumification and AC Concerns

NorCalFor20

Smokes, lets go
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I'm planning on using Fantech 12 in FKD 12XL 2013 CFM fans pushing the hot air out of the lights for each line of 10x 1000w lights. Starting the intake from the Work room (So I don't exhaust my co2) exhausting out the top of the roof. Since I run 8" air cooled lights, somewhere I will need to have a 8" reducer, I'm wondering which part of the run is the best place to do this? Will this reduction kill my airflow? Obviously, some- but could a 12" 2013 cfm fan reduced to 8" still effectively air-cool a string of 10x 1000w lights?

I'm curious how far these fans can blow air before becoming ineffective. I realize the lights at the end of the row are going to have much warmer air flowing overhead, my ultimate goal is to reduce the cooling requirement of this room down to 2x 4 ton split systems and reduce heat around the canopy.

As far dehumidification- I'd like to be able to get away with using 2 Quest Dual 155 dehumidifiers. I'm sure some would advise 2 Dual 205's but don't want to up the size on those unless absolutely necessary. Which way should I go on that?

Thanks in advance to everyone with my questions as of late, I really appreciate the advice but I have gotten some mixed answers, hoping to finalize these requirements to get my inventory list exact to finish my order.
 

queequeg152

Active member
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its important to recognize that your fans rated at 2013 cfm only at a specific static pressure. manufacturers usually state the highest cfm possible... so they use 0 static pressure, which is basically impossible to achieve in the real world.

i think panasonic actually states their cfms honestly... their advertised values being at .2 inches of static pressure, which is achievable with some amount of forthought.

anyway, the best possible situation would be to draw air into each hood in parallel not serial.

it would be wildly time consuming to build a duct system like that though.


i would suggest at least splitting your proposed series of 10 lights into 2 branches of 5 per string.

this will give you more cross sectional area, lower air velocities and reduce the static pressure drops across each of the lamp hoods.

basically you will get higher cfms in this arrangement compared to a 10 lamp serial, likewise you would get even more in 5 branches of two lamps but again... cost and time.

i should point out that you are still going to be approaching something like 2000 fpm in the main 12" trunk alone, where the two 5 light strings connect.

two 8's come close to matching the cross sectional area of a single 12"... but the velocity will be slightly higher in the 8".

if you choose to just neck down to 8" without splitting into two symetrical 8" branches... you will be introducing savage static pressure losses. in general you want to keep duct velocities relatively close, slowly ramping up in the main trunks. huge differences in speed at branches cause huge dynamic losses.

a 12" necking down to an 8"... assuming 1500cfm is a velocity change of 2000 fpm. this is absolutly enormous.


regardless, you are into like ... commercial kitchen ventilation territory, very high speed with very high dynamic losses across fittings like elbows, tees, flex duct corrugations. it would be to your advantage in going with high efficiency elbows, wyes, etc. where ever you can.
 

queequeg152

Active member
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I'm curious how far these fans can blow air before becoming ineffective.

its a matter of the fans static pressure capacity amongst other things.

mixed flow inline fans fall somewhere in between axials and centrifugal... with the centrifugals being the best at coping with static pressure-hence their use in forced air ac and heating systems.

your fan probably tops out around 1" w.g., however it will perform so poorly at 1",as to be useless.

its going to be far more efficient around .5" w.g.

i suggest you try and get the data from the manufacturer. they should have some blower tables or graphs showing cfms at various static pressures.
 

Cork144

Active member
I am currently planning a sealed room too, much smaller, 9 x 600s and have some questions since you have already been doing some research, but how do I utilize an ac in a sealed envrionment?
 

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