how to size fan and louver combination

[Carl30]

i have a 15' x 18' room with a 10 tall ceiling which will have two 75 hp blowers (only one on at a time) and two 10 hp smaller blowers. i am trying to size a fan louver combination to dispense with the heat. any suggestions?

 

[cme]

What is the total cfm?

Is there an adjacent building with air intakes nearby?

Is this at grade level?

Are there any air intakes in the same building nearby?

What type building is this?

What effluents are in the airstream?

 

[walkes]

To dispense with heat you have to determine the space heat gain. Lighting loads, motor inefficiency etc. The fan would be sized to remove heat based on your allowable space temperature. (Usually a max of 104°F for electrical equipment.)

Q = 1.08 CFM * Delta T
Q = heat gain in Btu/hr
Delta T = 104°F - OA Temp
(if OA temp exceeds 104°F you may require mechanical cooling)

Once CFM is determined size your louvre for pressure drop and water penetration. Size your fan on CFM and pressure drop.

Some details of your situation would have to be implemented in any of the calculations. The above is a very general description.

 

[tombmech]

I've been trying to figure out for several days what in the world you're doing with 2-75hp blowers in a 15x18x10 room. Just for kicks, the round numbers on that could be in the neighborhood of 70,000 cfm - 25 air changes per minute or 388 fpm face velocity (across the long side!).

On the short side, it's closer to 500 fpm, so you might forget the walls and just build louvers, instead - on both ends.

Interesting. Yes, please tell us what it's about.