Openstudio unwanted changes on idf file

asked 2019-07-18 09:45:13 -0500

Niraj Kunwar
31 ●2

updated 2019-07-18 11:21:07 -0500

shorowit

10911 ●180 ●9 https://www.nrel.gov/b...

Hi Everyone,

I was trying to use a openstudio measure to split windows into different section for ASHRAE90.1 2016 Midrise reference building. After importing the idf file to openstudio and exporting it (without using any measure for checking) it changes "Buildingsurface:Detailed" objects from 138 to 180 , Changes to zone name adding "thermal zone" in the end of all the zones and also changes the "Global Geometry Rules" causing the Azimuth of building surface (wall) and it's "sub-surface" to be 180 degree if each other.

I was curios if there was an option to select global geometry rules and also not to change the zone name while importing idf file to openstudio and then exporting it. (Else there are alot of references made to the thermal zone that needs to be edited).

Thanks, Niraj

answered 2019-07-19 00:30:03 -0500

David Goldwasser

20295 ●94 ●14 http://www.openstudio.net/

The Import IDF functionality in OpenStudio is meant to provide an entry path to OpenStudio for IDF files, but isn't intended to round trip back to that IDF file. The import focuses on geometry, constructions, loads, and schedules.

You may want to look at the Inject OSM Geometry into External IDF measure on BCL, that is setup for specific use case where someone wants to use IDF based workflow but leverage some OpenStudio geometry measures. The idea to inject the updated geometry back into the original IDF file, vs. relying on OpenStudio round trip translation of the entire IDF. Workflow would look something like this. - Import IDF file into OSM - Run OpenStudio measure to modify geometry - Run EnergyPlus measure mentioned above to inject modified OSM geometry into original IDF.

This measure adjust the zone names back to what was in the original IDF. For reference there is an enhancement request related to this behavior in the reverse translation used for import IDF.

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Hello, David. The link of the "Inject OSM Geometry into External IDF" topic you cited is offline. Do you have a new reference for this? I'm having the same problem here. Thank you