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My name is CK and I have question on calculating static pressure through a ducting network.

Some context:

The ducting network services 360 identicle components. This is achieved by dividing a main duct into 4 branches, each servicing approximately 90 components. There is a desired volumetric flow rate of 500 m3/s through the main duct, which theoretically breaks down to 1.39m3/s per component.

The 4 branches that the main duct breaks off to, has a tapered design. Components furthest from the branching point have smaller ID's while ones close have a larger, this is done to ensure a 'semi-consistent' air velocity (m/s), pressure drop etc. Additionally, each component is equally spaced out along the branches. The air flow from each component can be adjusted by a gate setting.

The question:

Currently we use a manometer to measure static pressure at a point very close to the component. This is achieved through a 3mm drilled hole on a side of the duct, close the component. It is believed that static pressure is sufficient in evaluating the balance of air flow between components.

What I would like to do is to put together a spreadsheet, that captures the variation in static pressure from component to component. I have drawings of the entire ducting network.

It would be great if you may provide me with some direction or key equations that would be useful in putting this spreadsheet together.

Thanks in advance!

CK

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# Calculating Static Pressure Through Duct Network

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