Question-and-Answer Resource for the Building Energy Modeling Community
Get started with the Help page
Ask Your Question

WWR measure creates windows that extend beyond surface boundaries

asked 2021-04-14 16:53:30 -0500

updated 2021-04-14 19:53:14 -0500

I am trying to run the "Resize existing windows to match a given WWR" measure to increase WWR from 25% to 40% and the measure runs without warnings; however, when I look at the model geometry (see attached image) it shows the windows now extending beyond the parent surface. Is there a way around this or is this issue inevitable if my original windows already take up the full length of the wall (i.e. does the measure only operate on the length of the window)?

Surprisingly, the simulation ran with no severe errors and yielded seemingly reasonable results. Though I did get the following warning for each window:

   ** Warning ** Base surface does not surround subsurface (CHKSBS), Overlap Status=Partial-Overlap
   **   ~~~   **   The base surround errors occurred 1 times.
   **   ~~~   ** Surface "SURFACE 15" overlaps SubSurface "SUB SURFACE 2"

Resize WWR 40% Measure

edit retag flag offensive close merge delete


Update: I was able to fix this going facade-by-facade using the "Set Window to Wall Ratio by Facade" measure. Would still be good to understand how to use the original measure though.

jbatt's avatar jbatt  ( 2021-04-14 17:07:21 -0500 )edit

Hello, can you please mention how you managed to use the "Set Window to Wall Ratio by Facade" without adding windows to all the facades. on my side it adds windows to all facades even the ones I would like to keep windowless. Thanks!

Moe B's avatar Moe B  ( 2023-08-14 11:35:33 -0500 )edit

1 Answer

Sort by ยป oldest newest most voted

answered 2021-04-14 23:54:39 -0500

I think this issue is specific to that specific measure:

The OpenStudio Surface::setWindowToWallRatio method scales out to edge of the wall only (it leaves a 1" gap):

edit flag offensive delete link more

Your Answer

Please start posting anonymously - your entry will be published after you log in or create a new account.

Add Answer

Training Workshops


Question Tools

1 follower


Asked: 2021-04-14 16:53:30 -0500

Seen: 256 times

Last updated: Apr 14 '21