Obstruction in front of louvers
Obstruction in front of louvers
(OP)
For a project I'm working on, there is a 8.75' x 6.5' acoustic intake louver that might have a 3' tall planter located 10" from the louver. The airflow is 13,000 cfm and the face velocity is 508 fpm. Is there enough room between the planter and the louver? Is there a minimum distance that objects need to be separated from a louver?
There is also have a 8.75' x 6.5' acoustic exhaust louver that might have a sign covering the whole louver and be 2' in front of the louver for aesthetic purposes. The air flow is 13,000 cfm and the face velocity is 508 fpm. Is this enough distance from the louver to get the proper airflow? And again, is there a minimum distance for objects in front of a louver?
There is also have a 8.75' x 6.5' acoustic exhaust louver that might have a sign covering the whole louver and be 2' in front of the louver for aesthetic purposes. The air flow is 13,000 cfm and the face velocity is 508 fpm. Is this enough distance from the louver to get the proper airflow? And again, is there a minimum distance for objects in front of a louver?





RE: Obstruction in front of louvers
RE: Obstruction in front of louvers
How about the sign in the second example? Would the sign cause a problem?
RE: Obstruction in front of louvers
> 13000 cfm / (8.75' * 6.5') = 228.6 fpm, the lower flow is good, less of an issue with noise and leaves getting sucked into the louvers
> noise
> hypothetically, you need something like 1 object diameter's separation for the flow to return to normal: https://github.com/timhutton/latticegas. Otherwise, you will likely get a noisier system
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RE: Obstruction in front of louvers
The questions:
Yes.
No.
Yes.
No.
RE: Obstruction in front of louvers
RE: Obstruction in front of louvers
RE: Obstruction in front of louvers
RE: Obstruction in front of louvers
Yes, but since air is compressible and liquids are not, the problem is complicated, not basic. The fan type and operating characteristics are more important than louver dimensions. Is there one fan, or two (one intake, one exhaust). The technical information from the fan manufacturer needs to be evaluated to see how sensitive fan operation is to airflow disruption.
IMHO, the planter in front of the intake is a small problem. The sign just outside the exhaust is a big problem.
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RE: Obstruction in front of louvers
RE: Obstruction in front of louvers
Stay in practice with the slide rule... I was teaching a grandchild how to use one last month.
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