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sagarrajup
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Join Date: Feb 2013
Posts: 4

HVAC Air Flow

02/27/2013 10:30 AM

how to decide air velocity for given air flow(example like 2000CFM) in AHU if it has some static pressure due to some pressure drops in duct, obstacles in AHU, without knowing duct dimensions, at start after calculation of AIRflow how it will be decided.
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Pathfinder Tags: air velocity selection HVAC air flow
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lyn
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Join Date: Oct 2008
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#1

Re: HVAC Air Flow

02/27/2013 11:15 AM

Asking the same question over and over won't get you a better answer.

There are thousands of free calculators on-line.

HVAC Calculations and Duct Sizing - PDHonline.org
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Ried
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Join Date: Dec 2005
Posts: 1602
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#2
In reply to #1

Re: HVAC Air Flow

02/27/2013 11:34 PM

Not exactly the same question, but a refinement of the previous question.

ASHRAE and some fan data books will provide guidelines for air velocities for various situations. These are based on how much noise the space can handle and how much pressure loss you can handle with the fan. Small ducts with high air velocities are noisy and energy inefficient, but somewhat inexpensive to buy and install. Large ducts with slow air flows are quiet and have minimum friction losses, but are more expensive.

It becomes a matter for judgement for each application.

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