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How to size HVAC duct for VAV system?

HVAC
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Question ajoutée par Ahmed Gahlan , Senior Technical Engineer , Saudi Binladin Group. (Public Buildings & Airports Division)
Date de publication: 2015/04/12
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Muhammad Arsalan Siddiqui
par Muhammad Arsalan Siddiqui , Associate Director (MEP) , JLL

same procedure of normal ducting but check the size of VAV Box. During VAV Open the cfm in the other branches will be standard required CFM but if the fan of unit is not with VSD then on closing VAV the CFM will be increased in other branches so they have to be designed on that cfm during VAV is closed but it is better to have VSD on the unit fan

chetan sharma
par chetan sharma , Senior project engineer , trinity engineering services

friction factor to be set at0. to 1" WC/ ft

Sherif Mohammed Ibrahim
par Sherif Mohammed Ibrahim , Senior Mechanical Technical engineer , Al-Latifia Trading & Contracting Company

duct sizing will be done at maximum CFM indicated

friction0.08 to1" WC/100 ft , watch the velocity limits 

read well manufacturer recommendation

magdy abd al nour
par magdy abd al nour , HVAC Site manger , First United Co.

normal duct sizing >>>then use one piece round to square to connect to the VAV

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