Shading impact on daylighting

asked 2020-06-05 11:38:59 -0500

Julien THIRIFAYS's avatar


I try to determine the impact on shading transparancy on daylighting. I made a quick model to do my tests. It's a single space with one window (North orientation), wich is shaded:

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I have a Illuminance Map and a daylight sensor in my space. On the documentation of shading surfaces (here), I see that for the daylighting calculation, the shading surface’s visible transmittance is assumed to be the same as its solar transmittance.

But, That's not what I observe in my tests. See below. In blue and orange, the Mean Illuminance Map and Daylight Sensor Illuminance for my test-case without any shading. In all the others colors, the same results, but for my test-case with shading, with a transmittance schedule of 0, 0.5 and 1.0. It seems like wathever the transmittance schedule is, the result is allways the same, like if the shading was completly opaque.

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I assume I do something wrong, but I don't know what. Somebody can help me with this? Thanks!

I'm usign OpenStudio 2.9.1. The solar Distribution is FullInteriorAndExteriorWithReflectance.

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Hi Julien, I have the same problem. Could you manage to solve it? Thanks, Berrak

Berrak's avatar Berrak  ( 2023-06-13 04:25:52 -0500 )edit