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Radiance measure and interior blinds

asked 2019-01-07 02:03:18 -0500

hribr's avatar

updated 2019-01-07 09:28:35 -0500

I am using radiance measure in OpenStudio and interior blinds on my model which is basically a cube with window on one side. In my simulations I am changing cube's shape and window orientation. When I changed cube measures to 12 times 36 feet with window on a short side pointed on north, the simulation failed. This happens only in case where the window is pointed on north. Simulation is successful with other orientations or other cube shapes (18 times 24, 24 times 18, 21 times 21, 36 times 12 feet). (ceiling height is the same in every case - 9 feet).

I am wondering why only this cube shape and north orientation is problematic.

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rfluxmtx: warning - ignoring output file in sender ('output/dc/WG1.vmx') rfluxmtx: opening pipe to: rcontrib -fo+ -ab 2 -ad 512 -as 256 -dj 1 -dp 1 -dt 0 -dc 1 -lw 0.001 -n 1 -fda -c 10000 -bn 1 -b "if(-Dx0-Dy0-Dz*1,0,-1)" -m groundglow -f -p MF=1,rNx=0,rNy=0,rNz=-1,Ux=0,Uy=1,Uz=0,RHS=+1 -bn Nrbins -b rbin -m skyglow -y 145 "!oconv -f -i octrees\model_dc.oct skies\dc_sky.rad" rfluxmtx: sampling 145 directions



oconv: fatal - boundary does not encompass scene rcontrib: fatal - (!oconv -f -i octrees\model_vmx.oc

hribr's avatar hribr  ( 2019-01-08 00:58:47 -0500 )edit

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answered 2019-01-10 09:54:43 -0500

updated 2019-01-11 10:06:04 -0500

Interesting (Spock voce). How are you changing the models' shape for each iteration? It seems like there's some discontinuity in the Radiance scene files causing the oconv error. Are you changing the geometry at the source (in the osm), or performing some translations on the exported Radiance model, or, ???

Maybe a brief description of your workflow, and perhaps a link to download your model would help.

Updated: Thanks for the images, but please explain how you are rotating the model. i.e., are you creating a new osm and actually rotating the geometry, or are you changing the building orientation in OpenStudio by changing the "north axis"? Also, how are you applying shades to the model?

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answered 2019-01-11 03:55:08 -0500

hribr's avatar

updated 2019-01-11 03:57:04 -0500

I made models with different measures separately in SketchUp environment. For orientation difference I am just rotating the models.

When I pointed the window side of a model to south, east and west, everything is fine, when I pointed it to north the error occurs. The error does not occur with the same model pointed to north where the windows are on larger side of a model.

This model do not work with windows pointed to north. image description

This model work with windows pointed in every main direction (E, W, N, S). image description

Is it something with the small amount of light coming in the room? I am using blinds. (Location is Ljubljana - Slovenia - central Europe).

This is not an answer, I just juse this to put some pictures in.

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I would add this follow-up and the images to your original post. My own follow-ups are in my answer above.

rpg777's avatar rpg777  ( 2019-01-11 10:01:50 -0500 )edit

I am rotating the model with SketchUp tool and saving as new .osm model. I applied shades in OpenStudio (shading control, interior blinds (blind window material, on if high solar on window, schedule by occupancy, ...) )

hribr's avatar hribr  ( 2019-01-11 10:45:11 -0500 )edit

OK so if I understand you correctly, you only experience this error when the building is long in the N/S axis, and the window is on the north side. Could you post a link to that particular osm?

rpg777's avatar rpg777  ( 2019-01-11 13:07:43 -0500 )edit

I would also keep your illuminance maps constrained to the interior of the spaces. You can see in the image above that you went corner to corner. This will place calculation points on the space boundary, which will cause problems in the simulation. Since the walls are infinitely thin, rays may 'hit' inside or outside. Besides, you should never calculate the illuminance right at the wall, anyway. You should have the grids offset into the space a foot or two.

rpg777's avatar rpg777  ( 2019-01-11 13:13:00 -0500 )edit

Here is the link to the model:

And thank you for your advice about illuminance maps.

hribr's avatar hribr  ( 2019-01-21 11:49:00 -0500 )edit

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Asked: 2019-01-07 02:03:18 -0500

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Last updated: Jan 11 '19