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Does Openstudio support curved forms ?

asked 2015-06-06 09:38:11 -0500

PakinamBadra gravatar image

updated 2017-05-03 19:53:38 -0500

My design is a almost a full circle, I tried working with it on openstudio but It always gave me errors even before starting the simulation. I had to turn my form into segments to make it more compatible but I'm facing a problem with selecting surfaces to create overhang or any kind of projections . Is there a way to over come this or does the program only accept forms that's only cube shaped ?

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answered 2015-06-09 10:45:02 -0500

updated 2015-06-09 10:47:38 -0500

OpenStudio and EnergyPlus doesn't support a true curve, but you can mimic a curve by using segments. This is in fact all SketchUp supports as well. When you make a circle (before you extrude it up) you can change the number of segments. Keep in mind, more segments means more surfaces within a zone. The radiant calculations at each timestep for a zone does calculations equal to the square of the number of surfaces. The moral, if 16 segments, or even 8 are fine, don't try 64.

What specifically are you trying to do with shading surfaces? Do you have a ring shading surface that matches the curve? If you used the basic overhang by projection factor you would end up with something looking more like a gear (with gaps). If you want a ring you could model it by hand. I would create a new shading group in SketchUp and then draw a segment circle equal to the size of the building. Then use the offset tool to create a ring. bigger by the desired amount. Then select the original circle and delete it leaving only the ring. Make sure you draw lines to segment the shading surface so it isn't non-convex, and so you don't have an impossible surface with a whole in it (EnergyPlus doesn't have surfaces with both inner and outer loops, in the situation of a window, if you look at the base surface in the data file, there is no hole, that is just how we represent it in SketchUp). If you are comfortable in SketchUp you could also just draw one segment and use the rotate tool to do a polar array to copy the segment around.

I attached images from a quick mockup.

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Using offset tool

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segmenting surface after removing inner circle from ring

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By the way, what errors are you seeing?

David Goldwasser gravatar image David Goldwasser  ( 2015-06-09 10:46:12 -0500 )edit

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Asked: 2015-06-06 09:38:11 -0500

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Last updated: Jun 09 '15