[Radiance-general] Illuminance Values

[Greg Ward]

You know that putting your blinds at 90 degrees closes them  
completely, right?

-Greg

> From: G V DEEPAK <deepak.gv at ufl.edu>
> Date: February 26, 2009 8:24:39 AM PST
>
> Hello Everyone,
>
> I am simulating a simple office space 10' X 18' with a 6' X 6'  
> window, and the automated Venetian blinds. I am trying to compare  
> Illuminance values for two models:
> 1.        In the base case the slats have the same tilt angle at  
> one point of time ("conventional control").
> 2.         In the prototype model, the blinds are divided into  
> three sections: Top , Middle and Bottom Blinds, each of equal  
> dimensions ("splitcontrol"). In each section blinds can have the  
> different slat tilt angle.
>
> For pilot testing I tested  conventional control for  0, 45 and 90  
> degrees and split control for 0, 45, and 90 degrees, too (i.e. I  
> kept the same tilt angle in each section of the split blinds just  
> for the pilot testing  and the result  comparison purpose).
>
> The results that I obtained show variation in the values of  
> Illuminance obtained for these two models (results difference  
> ranges from 10-150%) although the results should be the same.
>
> Conventional Blind
> genblinds whitealum main 0.0125 1.82 1.88 195 90 |xform -rz 90 -t  
> 2.71 0.05 0.8>conventional90.rad
>
> Split Blinds
>
> genblinds whitealum main 0.0125 1.82 0.63 66 90 |xform -rz 90 -t  
> 2.71 0.05 2.06>66-1-90.rad
>
> genblinds whitealum main 0.0125 1.82 0.63 65 90 |xform -rz 90 -t  
> 2.71 0.05 1.43>66-2-90.rad
>
> genblinds whitealum main 0.0125 1.82 0.63 65 90 |xform -rz 90 -t  
> 2.71 0.05 0.8>66-3-90.rad