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perforated tube as air diffusser(continued)

perforated tube as air diffusser(continued)

perforated tube as air diffusser(continued)

(OP)
How shall it be take the calcs to know how to spread or diffuse air in a flexible duct in all its length .
The case is so.
Air to handle 20 meter cubic/minute.
aviable static pressure 25 mm water columm
The duct its located at 2,80 meter heigth , and the area to be cooled is about 1,20  meter from floor.
The temperature diference will be about 5 to 7 centigrade degree
A 300 mm (1Ft) diameter polyethilene film 150 micrometer thick , will be used as a DUCT .
The holes will be from the 4 to 8 hours location .

This system try to replace the ventilation socks made from textile fabric.

My concern is how to calc the hole diameters and it´s pitch so the air speed over the area is no more than 15 meter minute.
I need to lower the temperature with out chilling efect.
Hope it is clear , any further info will be given if needed

Pardal

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