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<p class="MsoNormal"><span style="" lang="EN-US">Dear
Radiance list,</span></p>
<p class="MsoNormal"><span style="" lang="EN-US">I have
build up a model of a room with external glass blinds. The aim with my
simulations is to obtain the light transmittance of the glass blinds, and for
the entire system (blinds + window).</span></p>
<p class="MsoNormal"><span style="" lang="EN-US">The blinds
are modeled as polygons with the trans material. This means that the blinds
have no thickness in the model, but the reflectance and transmittance values
correspond to the information from the glass manufacturer (r=0.31 and LT=0.65).
</span></p>
<p class="MsoNormal"><span style="" lang="EN-US">My approach
is to obtain illuminance at three different locations: </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US">1)
Before the blinds, externally; </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US">2)
Between the blinds and the window, externally; </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US">3) After
the window, internally. </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="" lang="EN-US">I have
therefore made a grid of points in these locations. The orientation of my
measuring points is outwards, perpendicular to the façade.</span></p>
<p class="MsoNormal"><span style="" lang="EN-US">My results
show that the illuminance level is increased at loaction 2 compared to location 1, which
is a result I do not find reliable! I have placed calculation points in the
entire height of the window with a spacing of 0.01, to be sure not to have the
result affected by high illuminance levels locally. I would have expected
higher illuminance levels locally due to the redirecting of light in the glass
blinds, but I would not have expected a higher average illuminance level.
My simulation approach is given below – please let me know if you can
find any mistakes.</span></p>
<p class="MsoNormal"><span style="" lang="EN-US">Thanks in
advance</span></p>
<p class="MsoNormal"><span style="" lang="EN-US">/Anne</span></p>
<p class="MsoNormal"><span style="" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="" lang="EN-US"> </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US"># /az
30, </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US">#Room.rad
includes room geometry, </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US">#LamelSystem.rad
includes geometry of the blinds, </span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US">#Syst2.rad
includes geometry of the window system for mkillum</span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US"><br>
oconv materials.mat CIE.sky Room.rad
LamelSystem30.rad Syst2.rad >
./profil30az0alt30/scene_window_prof30alt30az0.oct<br>
<br>
cat Syst2.rad | mkillum -ab 4 ./profil30az0alt30/scene_window_prof30alt30az0.oct
>./profil30az0alt30/scene_window_prof30alt30az0_i.rad<br>
<br>
oconv materials.mat Room.rad
./profil30az0alt30/scene_window_prof30alt30az0_i.rad CIE.sky >
./profil30az0alt30/window_ii.oct</span></p>
<p class="MsoNoSpacing"><span style="" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="" lang="EN-US">#points in
grid inside the room<br>
cat points.xyz | rtrace -w -h -I+ -ab 3 -aa 0.1 -ad 1026 -as 256 -ar 512 -ds .3
-oov ./profil30az0alt30/window_2ii.oct | rcalc -e
'$1=179*($4*0.265+$5*0.670+$6*0.065)' >
./profil30az0alt30/prof30al30az0_2.dat</span></p>
<p class="MsoNormal"><span style="" lang="EN-US">#points
before and after the blind<br>
cat extpoints.xyz | rtrace -w -h -I+ -ab 3 -aa 0.1 -ad 1026 -as 256 -ar 512 -ds
.3 -oov ./profil30az0alt30/window_2ii.oct | rcalc -e
'$1=179*($4*0.265+$5*0.670+$6*0.065)' >
./profil30az0alt30/prof30al30az0_2ext.dat </span></p>
<br clear="all"><br><br>