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I have also done a check calculation manually and the fittings Revit MEP is using is different ASHRAE fittings to those it should be using.

For instance for a mitred bend Revit uses CR3-17, which is actually a Z shaped elbow and not CR3-6 which is a mitred bend.

At the moment some of my systems are over calculating and some are under calculating the pressure drop by around 15 in revit.

Is Autodesk going to fix this bug Is there a way to assign the ASHRAE part by type The way it seems to work is that the fixture is specified as a part type - elbow for instance, and this then pulls up the ASHRAE.xml file which has a program which defines the part based on the size, flow, angle, etc.

Which would be fine except that it doesnt seem to be working.

Also from the ASHRAE line-up, this app can aid in the duct fitting process by performing pressure loss calculations.

More than 240 duct models are included, with measurement possible in both imperial and metric units.

Also, are the revit MEP calculation algorithims approved by ASHRAE Have they been checked by ASHRAE to be accurate If anyone has any help or if anyone at Autodesk is reading this - help Weve found the same thing, the built in ASHRAE database is pretty much useless.

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And like you mentioned, you cant really schedule anything usefull from the fittings Weve gone ahead and created a whole bunch of shared parameters, which can be scheduled, and added our own calculations within the fitting families to use the AIRAH loss values (you could do the same for ASHRAE or CIBSE too).

Unfortunately with duct fittings at least, you cant link to an external table of values (as far as Ive found), so you will need some pretty long nested IF AND statements to work out based on your geometryflow what the loss value will be.

On the connectors, weve changed them to global rather than fitting and assigned the flow and pressure drop shared parameters to the connectors.

You can then have calculations within the parameters that will read the flow from the system, work out the loss value, calculate the pressure drop and assign that back to the connector pressure drop.

Is this still an issue with recent versions of MEP Also, you stated that you are mapping the Pressure Drop parameters.

Did you mean youre mapping the K Coefficient parameter so that it can calculate pressure drop given a certain flow etc.

Also, Im getting some very strange PD calculations when using a manufacturers spec data for K Coefficient.

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