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Thread: Negative pressure values

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    Default Negative pressure values

    I have been facing some difficulties in REVIT MEP 2013, due to an unstable calculation in pressure values.

    Everything works mostly well, unless i use fittings, there's where the problem begins. At first i couldn't even select a table from the ASHRAE catalog, when i figured that out, i got another issue, my Pressure Loss is negative with a elbow in it.


    Elbow_ASHRAE_Table.jpgNegativePressure.jpg


    But when i go to the elbow and force it to a specific pressure loss, the system works. This could be the solution, but since i can't choose Tee's to have specific pressure loss, it messes with my design. Any ideas about this negative value in the system?

    Elbow_SpecificLoss.jpgNormalPressure.jpg

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    Default Re: Negative pressure values

    No one? Not even a hint?

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