Expanded Sheetmetal Resistance to Airflow
Expanded Sheetmetal Resistance to Airflow
(OP)
I am attempting to figure out how to determine the air flow resistance through a sheet of expanded sheet metal in regards to a pressure drop and velocity change. I figured I could determine the total area that is actually sheet metal and subtract it from the total size of the sheet to determine the area for the air to pass through. Would there be any type of loss coeffficients associated with this? I am trying to specify a fan and I am currently trying to calculate the required fan static pressure. thank you for any help you can provide!





RE: Expanded Sheetmetal Resistance to Airflow
Try here:
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RE: Expanded Sheetmetal Resistance to Airflow
RE: Expanded Sheetmetal Resistance to Airflow
If the material is used as a diffuser, you should put this question to the maker. If you are doing it yourself and this is an important space, reserve some time for full-scale tests.
RE: Expanded Sheetmetal Resistance to Airflow
I'm trying to find if this screen will have a pressure drop across it or if it would decrease the velocity of the air coming through it.
Thanks
RE: Expanded Sheetmetal Resistance to Airflow
B.E.
RE: Expanded Sheetmetal Resistance to Airflow
Can't tell from your graphic what the entrance angle is for your openings, if any, but I would think that would have some impact beyond just the ratio of areas, since the angles would deflect the air flow.
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RE: Expanded Sheetmetal Resistance to Airflow
RE: Expanded Sheetmetal Resistance to Airflow
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RE: Expanded Sheetmetal Resistance to Airflow
If you do not have access to the ASHRAE manual you could try Perry's Chemical Engineers' Handbook. In my 7th edition it is on page 6-19. The Perry method is for incompressible fluids, but this will be fine for the very small pressure drop you will get - i.e. you can safely regard air as incompressible in this application.
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