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Tom,<br>
The "incident receiver radiation" term includes both beam
radiation and diffuse radiation. Shading devices often either
occlude the beam radiation completely or not at all whereas the
diffuse radiation is reduced (more or less) by the view factor
between the receiver and the sky. In the case of a venetian blind,
the beam radiation is reduced by the blind but may or may not be
reduced by the same fraction as the diffuse radiation. In fact I
think that is rather the point of a venetian blind: it blocks the
beam radiation more than it blocks the diffuse but still allows some
to come through depending on the angle of the blades.<br>
Regards,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 4/19/2013 03:13, Tom B wrote:<br>
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<div dir="ltr">Dear all,<br>
<br>
When I took a look at the multizone building with an overhang as
it is made by the wizard in the Simulation Studio, I noticed
that it uses both the "Incident receiver radiation" and the
"Beam radiation on receiver" as an input for the multizone
building. I was wondering whether anyone can explain to me why
it needs both the Incident receiver radiation, which already is
all the radiation on the window if I'm not mistaking, and in
addition needs the beam radiation. <br>
<br>
I'm asking because I want to replace the Type 34 overhang
component with an Excel lookup table with transmission values of
a venetian blind, and I was assuming that multiplying these
total light transmission values of the shade with the total
incident radiation on the shade would give me the total
transmitted energy, and there would be no need to know the beam
radiation transmission individually as well. Can anyone tell
whether or not this assumption is correct and if not, why the
beam radiation is needed in addition to the total radiation?<br>
<br>
Thank you in advance for your time and effort.<br>
<br>
Kind regards,<br>
<br>
Tom Bouwhuis<br>
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<br>
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David BRADLEY
Principal
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