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How to calculate air outlet area?

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تم إضافة السؤال من قبل Mohamed Hamed , MEP Manager , AL Basha Palace engineering contracting LLC
تاريخ النشر: 2014/01/12
Muhammad Arsalan Siddiqui
من قبل Muhammad Arsalan Siddiqui , Associate Director (MEP) , JLL

It depends on the volume flow rate of the system. Normally velocity of air in taken250 -350 FPM at all air outlets.

Q = AV

Q = flowrate

A = area

V = velocity

If you know two parameters then you can find the third one 

Hope this is clear

Muhammad Nazar Qazi
من قبل Muhammad Nazar Qazi , MEP Manager , FWO

During selection & calculation of Grill/Diffuser Air flow, free area factor for grill/diffusers must be considered , recommended between0.85 to0.9

Siby Blesson
من قبل Siby Blesson , Estimation Engineer , Resi air

While designing the grill size we keep400 to500 fpm as duct velocity. Hence by area and velocity we get the flow.

HANI EWAIDA
من قبل HANI EWAIDA , Engineering & Maintenance Manager , Jerusalem Pharmaceutical Co.(Jepharm)

the velocity of air is critical issue for some applications specially Pharmaceutical facilities

i supose that velocity of400-600 fpm in air out lets is accepted

Jayakrishnan V G
من قبل Jayakrishnan V G , Project Engineer , Future World Electromechanical LLC

Determine the throw(m) and air jet velocity(m/s) you need from the outlet (diffuser or grille) first, then match that to the corresponding required flow rate (L/s or m3/h) in the manufacturers selection chart. Most diffuser manufacturers will give their selection chart if you request them. With these three factors (throw, airjet velocity and flow rate) corresponding to the desired noise level we can determine the outlet size. Or as rule of thumb take15 to30 percent extra area from the duct size required for same air flow.

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