jmirtsch commented 4 years ago

Hi, This seems to be an old problem, and while other posts have replies suggesting a fix, I don't see it when running open source code (in particular revit 2021).
https://sourceforge.net/p/ifcexporter/discussion/general/thread/4d6673e3/?limit=25 https://forums.autodesk.com/t5/revit-mep-forum/ifc-export-from-mep-to-si-units/td-p/6602256

Ifc air flow properties don't seem to be scaled from revit internal units. I've traced the code and seems to be a bug in the revit utils for scaling, but I could be wrong. Test files are attached.

Thanks,

Jon

567= IFCPROPERTYSINGLEVALUE('Air Flow',$,IFCVOLUMETRICFLOWRATEMEASURE(2.75454400427611),$);

201020 airflow units revit

201020 airflow units.zip

nrostin commented 4 years ago

Hi Team

We're implementing a workflow which relies heavily on this fix on the Queens Wharf project in Brisbane, it would appear as though it is not limited to airflow as well. Would be great to see this resolved for Revit 2021, we're in the process of upgrading and rolling out across the project Feb 2021.

Thanks QWB BIM Team

AngelVelezSosa commented 4 years ago

We know that there is a current error with specifically L/s. If you change to another display unit in the meantime, it should work properly. We believe we have internally solved all of the unit scaling issues, so if you want to provide trivial files with parameters and units that you feel translate wrongly into Revit, we can check the file before out next update.

Autodesk / revit-ifc

Airflow properties not scaled from revit internal units #237

567= IFCPROPERTYSINGLEVALUE('Air Flow',$,IFCVOLUMETRICFLOWRATEMEASURE(2.75454400427611),$);