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<p>Correct. Sunlit area applies to direct (beam) solar and is the
result of the surface (building and shading) shading calculations.
<br>
</p>
<p>Shading devices (blinds, shades, and screens) are modeled as part
of the window system, because there can be more interactions than
just impacting sunlit area. There can be inter-reflections between
the glazing and the shading device, beam can be changed to
diffuse, etc. There are many output variables that report various
details of the window system and shading device. Search the RDD
output for "Surface Window".</p>
<p>Mike<br>
</p>
<br>
<div class="moz-cite-prefix">On 10/3/2018 10:12 AM, Spyros Akritidis
via Bldg-sim wrote:<br>
</div>
<blockquote type="cite"
cite="mid:AM4PR04MB1522006A86E2499A3A8B44B2B5E90@AM4PR04MB1522.eurprd04.prod.outlook.com">
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<p class="MsoNormal">Hello everyone!<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am using EnergyPlus in order to calculate
the sunlit fraction (by unreflected beam solar radiation, as
specified in the Input-Output Reference) of window glazing
areas with the presence of external shading devices (e.g.
venetian blinds, shades). The output values of Surface Outside
Face Sunlit Fraction seem to be unaffected by the presence of
these shading devices.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I also tried another case: I removed the
shading devices and added an overhang (through the
Shading:Building:Detailed object in EnergyPlus). This time I
get variable output values of Surface Outside Face Sunlit
Fraction, indicating that the overhang was taken into account.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">So, is it safe to suppose that, at the
moment (at least), EnergyPlus cannot calculate the sunlit area
of external surfaces that are shaded by shading devices like
blinds, shades, screens etc.(I guess it has to do with the
polygon clipping algorithms) ?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Or is there a way that can be calculated in
EnergyPlus?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Spyros<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><span
style="color:black;mso-fareast-language:EN-GB">Spyros
Akritidis<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="color:black;mso-fareast-language:EN-GB">Research
Student<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="mso-fareast-language:EN-GB">School of Architecture,
Building and Civil Engineering
<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="color:black;mso-fareast-language:EN-GB">Loughborough
University<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="color:black;mso-fareast-language:EN-GB">m: +44 077
6399 5008<o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span
style="color:black;mso-fareast-language:EN-GB">e: <a
href="mailto:S.Akritidis@lboro.ac.uk"
moz-do-not-send="true"><span style="color:blue">S.Akritidis@lboro.ac.uk</span></a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><a
href="https://uk.linkedin.com/in/spyrosakritidis"
moz-do-not-send="true"><span
style="color:windowtext;mso-fareast-language:EN-GB;text-decoration:none"><img
style="width:.309in;height:.309in" id="Picture_x0020_1"
src="cid:part2.CE019EC1.921DD4F7@gard.com"
alt="Linkedin-logo 2" class="" height="30" width="30"
border="0"></span></a><span
style="mso-fareast-language:EN-GB">
</span><a
href="https://www.researchgate.net/profile/Spyros_Akritidis"
moz-do-not-send="true"><span
style="color:windowtext;mso-fareast-language:EN-GB;text-decoration:none"><img
style="width:.309in;height:.309in" id="Picture_x0020_2"
src="cid:part4.DDDBEDD1.AC85555F@gard.com" alt="photo"
class="" height="30" width="30" border="0"></span></a><span
style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
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