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Intersect/Match causes unnecessary surface fractioning

asked 2015-10-22 09:48:47 -0500

eloneill's avatar

updated 2015-10-22 10:29:33 -0500

We've got a model that we ran an intersect match on and it seems to be blowing up a wall in a few spaces. I've tried to delete the spaces and rebuild them, and I get the same results when I rerun the intersect/match. I'm not sure what this issue is, but any guidance on how to correct this would be appreciated.

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Here's a link to the model:

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answered 2015-10-22 11:00:08 -0500

updated 2015-10-22 15:24:07 -0500

The SketchUp based surface intersection can be problematic. Instead use the Surface Matching Measure in the OpenStudio application as described in this post.

If you see this happening to your model while you are in SketchUp, don't save your model after those changes or Save the model as another name.

Updated content below after @eloneill's comments and after reviewing model.

The diagonals seemed to be isolated to 4-5 spaces. I fixed those by deleting that face and re-drawing. Often easier than trying to clean it up.

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Changed this

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To this. And then drew in a new rectangle.

Ran it through the diagnostic script in the plugin and then the Remove Orphan and Unused Objects measure in the Plugin. Then I re-intersected and matched in the app with the surface matching measure.

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The first floor matched pretty well. There were a few spaces here there looked like a physical gap.

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There are 10-20 surfaces between the first and second floor that didn't match. Not sure why, but the easiness way to fix them is to identify by hand which two surfaces you want matched. Then select one of the two surfaces in the inspector and select the other surface as the "Outside Boundary Object". The plugin will change the boundary condition for you when you do this. It is a way to match surfaces that don't physically match or that our intersect measure misses. Hand surface matching is demonstrated in this post.

I'll email you an updated model.

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@david-goldwasser Thanks David. I tried to go through and delete the spaces that were problems. Then I rebuilt them and ran the measure from openstudio. The result, while not as bad, is still exibiting the same issue. Is there any way to salvage the model at this stage in the game?

eloneill's avatar eloneill  ( 2015-10-22 14:12:23 -0500 )edit

Meant to point out. EnergyPlus won't like the large windows with semi-circle tops. Windows should be broken down into rectangles and triangles.

David Goldwasser's avatar David Goldwasser  ( 2015-10-22 15:21:38 -0500 )edit

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Asked: 2015-10-22 09:48:47 -0500

Seen: 208 times

Last updated: Oct 22 '15