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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Dear Oselen,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">you are right with your idea, if you set the longwave radiation mode to simple and set the combined heat transfer coefficient equal to the convective part, the
<span style="background:white">longwave radiation</span> is effectively zeroed. One thing to keep in mind is that this is then the case for all surfaces in the room.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">If you want to consider the <span style="background:white">longwave radiation</span> for all surfaces
<b>but </b>the window, you can use the same method you did for the outside case. You can select
<span style="background:white">longwave radiation</span> detailed mode for the zone and set the back emissivity of the glazing + the frame to 0, too. In this case the window will behave like a
<span style="background:white">longwave radiation</span>-mirror so to speak and the
<span style="background:white">longwave radiation</span> exchange will still be calculated using view factors between the other surfaces in the zone. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><img width="812" height="400" style="width:8.4583in;height:4.1666in" id="Picture_x0020_11" src="cid:image001.png@01D7D7BD.BC1718A0"></span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Best regards,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Christina<o:p></o:p></span></p>
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<p class="MsoNormal"><i><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">__________________________________________________________________________________________________</span></i><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Transsolar KlimaEngineering</span></b><span style="color:black"><o:p></o:p></span></p>
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<p><span lang="DE" style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#7F7F7F">Transsolar Energietechnik GmbH | Curiestraße 2 | 70563 Stuttgart</span><span lang="DE" style="color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span lang="DE" style="color:black">Von:</span></b><span lang="DE" style="color:black"> TRNSYS-users <trnsys-users-bounces@lists.onebuilding.org> im Auftrag von Oselen Imafidon via TRNSYS-users <trnsys-users@lists.onebuilding.org><br>
<b>Gesendet:</b> Freitag, 29. </span><span style="color:black">Oktober 2021 15:21<br>
<b>An:</b> trnsys-users@lists.onebuilding.org <trnsys-users@lists.onebuilding.org><br>
<b>Cc:</b> Oselen Imafidon <josephoselen@yahoo.com><br>
<b>Betreff:</b> [TRNSYS-users] Zeroing inside and outside longwave radiation of window surfaces</span>
<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="xmsonormal"><span lang="EN-CA">Hello,<o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA">To zero the inside longwave radiation of the window I used the simple model longwave radiation exchange within a zone.
<o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA">To zero outside longwave radiation of the window, I modified both the window frame emissivity to zero and the front emissivity of the first window glazing in the building input description file (BIU) to zero.
<o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA">I used hand calculation to verify the simulation results using the following equations for heat fluxes to the outside and inside surface and the results were same.
<span style="color:black">. The result shows inside and outside longwave radiation of window surfaces are zeroed.</span><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA" style="color:black"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA">Is this the right way of zeroing <span style="color:black">
inside and outside longwave radiation of window surfaces?</span><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA" style="color:black"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA" style="color:black">Thank you.</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA" style="color:black"> </span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA" style="color:black">Regards,</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA" style="color:black">Oselen I</span><span lang="EN-CA"><o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA"> <o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA">Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">
Mail</a> for Windows<o:p></o:p></span></p>
<p class="xmsonormal"><span lang="EN-CA"> <o:p></o:p></span></p>
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