<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:72.0pt 72.0pt 72.0pt 72.0pt;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang=EN-CA link=blue vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Hello,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>To zero the inside longwave radiation of the window I used the simple model longwave radiation exchange within a zone. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>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. <!--[if gte msEquation 12]><m:oMath><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>Q</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>COM</m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>O</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>S</m:r><m:r>8</m:r></span></i></m:sub></m:sSub></m:sub></m:sSub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>= </m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>h</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>outdoor</m:r></span></i></m:sub></m:sSub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>×</m:r><m:r>Area</m:r><m:r>×</m:r></span></i><m:d><m:dPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:dPr><m:e><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>T</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>amb</m:r></span></i></m:sub></m:sSub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>-</m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>T</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>S</m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>O</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>S</m:r><m:r>8</m:r></span></i></m:sub></m:sSub></m:sub></m:sSub></m:e></m:d><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>, </m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>Q</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>COM</m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>I</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>S</m:r><m:r>8</m:r></span></i></m:sub></m:sSub></m:sub></m:sSub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>= </m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>h</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>indoor</m:r></span></i></m:sub></m:sSub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>×</m:r><m:r>Area</m:r><m:r>×</m:r></span></i><m:d><m:dPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:dPr><m:e><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>T</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>S</m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>O</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>S</m:r><m:r>8</m:r></span></i></m:sub></m:sSub></m:sub></m:sSub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r> – </m:r></span></i><m:sSub><m:sSubPr><span style='font-family:"Cambria Math",serif;color:black;font-style:italic'><m:ctrlPr></m:ctrlPr></span></m:sSubPr><m:e><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>T</m:r></span></i></m:e><m:sub><i><span style='font-family:"Cambria Math",serif;color:black'><m:r>indoor</m:r></span></i></m:sub></m:sSub></m:e></m:d><i><span style='font-family:"Cambria Math",serif;color:black'><m:r> </m:r></span></i></m:oMath><![endif]--><span style='color:black'>. The result shows inside and outside longwave radiation of window surfaces are zeroed.<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal>Is this the right way of zeroing <!--[if gte msEquation 12]><m:oMath><i><span style='font-family:"Cambria Math",serif;color:black'><m:r> </m:r></span></i></m:oMath><![endif]--><span style='color:black'>inside and outside longwave radiation of window surfaces?<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:black'>Thank you.<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:black'>Regards,<o:p></o:p></span></p><p class=MsoNormal><span style='color:black'>Oselen I<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Sent from <a href="https://go.microsoft.com/fwlink/?LinkId=550986">Mail</a> for Windows</p><p class=MsoNormal><o:p> </o:p></p></div></body></html>