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  1. scottlsu

    Duct static pressure simulation

    Is this forum for criticism or for support? What I mean by Revit MEP's inability to "simulate different static pressure conditions" is that you cannot adjust your fan parameters to see its affect on ESP.
  2. scottlsu

    Duct static pressure simulation

    I should say, that the AHU was replaced 5 years ago. No specs changed from the original prints. My point is that it is in very good, clean condition. And all of the ductwork is very well done and well sealed. Also I have confirmed the wheel's max RPM. It is a Lau H Series 26"
  3. scottlsu

    Duct static pressure simulation

    mauricestoker, I totally agree. someone else mentioned early that the vav terminals should be replaced with pressure independent terminals to completely solve the problem and also make it more energy efficient. Unfortunately the owner just had all of the terminal units replaced and relocated...
  4. scottlsu

    Duct static pressure simulation

    No i mean the fan is at its mechanical limit. Its got a tag on it that says max RPM 900.
  5. scottlsu

    Duct static pressure simulation

    The fan is already at max RPM after adjusting the existing pulleys...
  6. scottlsu

    Duct static pressure simulation

    Let me re-iterate my problem. To address whether a T&B was done: This is a system which has operated for 30 years. Yes, a t&b was done at some time in the past. However, I do not think that it was successful. There is simply no means of calibrating the VAV terminal unless there is 1" SP...
  7. scottlsu

    Duct static pressure simulation

    gee thanks. what is the point of this forum then? it allows people to network and discuss ideas who wouldn't typically get the chance...in a non-binding way (so much so that we'll never meet). if you don't have anything to contribute to the topic, then don't. don't suggest that the...
  8. scottlsu

    Duct static pressure simulation

    Thank you all for your insight into this, as it is helping me to understand the concept of the system curve. I realize now that by sheaving the motor, I was just walking the fan along the system curve of the ductwork. I need to adjust my system curve (by physically modifying ductwork), so that...
  9. scottlsu

    Duct static pressure simulation

    The blower motor has an adjustable pulley. We have adjusted it all the way, and gained .2" of static. The unit already has a VFD on it. I have done this: Varied the drive from 0-100% and measured downstream SP and ESP. I then extrapolated this (exponential looking) in order to come up...
  10. scottlsu

    Duct static pressure simulation

    I am currently working on a problem with a 20,000cfm VAV AHU. This has system powered terminal units (Carrier Moduline) which require 1" of static at the terminal unit in order to modulate. The problem is that there is not enough static pressure at most of the units for them to modulate. This...

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