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  1. #1

    Dynamic AirFlow Troubles! Plz help

    I am a Clean Room Specialists and am having some issues with a dynamic system which is being controlled by Price vav's at which are attempting to maintain a negative pressure and constant flow in a space. I have noticed at times that the DP varies although flows are being maintained and duct static pressures are maintained.

    The system varies from -.06(ideal) to -.09(life safety concern) however like I said the flow rates have negligible change no more than about 35cfm on a system that flowing 1200cfm. When the system pressure gets upwards of -.09 we have door closing issues. Any suggestions or information would be helpful.

    Thanks

    BB

  2. #2
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,324
    -.09(life safety concern)???

    There is more of pressure loss going from 0' elevation to 500' elevation.
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    How many times must one fix something before it is fixed?

  3. #3
    Its been determined that once the space starts to hit a -.1 it takes upwards of 60lbs of pull to open the door. In case of an emergency its a concern on whether a 4'10" 90lbs young lady can open the door or not.

  4. #4
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,324
    A 3'X7' door with a negative pressure of .1" holding it shut, would only have a total of 10.8 pounds of force against it.
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    How many times must one fix something before it is fixed?

  5. #5
    Join Date
    Aug 2012
    Location
    Gainesville, FL
    Posts
    325
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    Last edited by Pete838; 08-19-2012 at 12:10 PM.

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