Did you know? The Static Pressure reported in a Duct System Schedule reports the same value that the System Inspector reports as the Static Pressure at the duct section closest to the inlet to that system. This value is the sum of all the losses along the critical path for that system, including losses in duct segments, fittings, air terminals, and other accessories.
The Pressure Loss value you see in the inspector is the sum of the losses only in that section (which generally includes ducts and fittings of the same flow and size).
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I have leveraged both features to convey static pressure calcs are performed in RME. However, the engineer is questioning numbers. How does RME calculate static pressure.
Posted by: Bill Knittle | August 30, 2012 at 11:11 PM
Hi Bill-- there is a detailed example here http://wikihelp.autodesk.com/Revit/enu/2013/Help/00001-Revit_He0/3251-Referenc3251/3276-Hydronic3276/3280-Pressure3280 for pipe, and a detailed example for duct here http://wikihelp.autodesk.com/Revit/enu/2013/Help/00001-Revit_He0/3251-Referenc3251/3259-Duct_Siz3259/3260-Duct_Siz3260/3262-Pressure3262
Additionally, in 2013, there is a pressure loss report tool for duct and pipe that provides a complete breakdown of where all the numbers come from... similar to why you'd find in the ASHRAE Handbook Fundamentals 2009 starting on page 21.22
Posted by: Martin Schmid | August 31, 2012 at 01:53 AM