<div>Julie.</div>
<div> </div>
<div>also your convective heat transfer along the window will decrease .... You might find values for that in the literature. Maybe check the ASHRRAE study on that.</div>
<div> </div>
<div>Leen Peeters<br><br></div>
<div class="gmail_quote">On Tue, Jun 22, 2010 at 9:18 AM, Adrien JEZEQUEL - ITF <span dir="ltr"><<a href="mailto:a.jezequel@itf.biz">a.jezequel@itf.biz</a>></span> wrote:<br>
<blockquote style="BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex; PADDING-LEFT: 1ex" class="gmail_quote">
<div text="#000000" bgcolor="#ffffff"><font size="-1"><font face="Arial">Dear Julie,<br><br>I suggest you to put an equation tool outside of Type56. In that equation tool, ESHAD (</font></font>the ratio of non transparent area of the shading device to the whole glazing area, as defined in TRNBUILD<font size="-1"><font face="Arial">) will be calculated depending on blinds position. </font></font><font size="-1"><font face="Arial"><br>
If you consider that</font></font><font size="-1"> :<br></font>
<ul>
<li><font size="-1"><font face="Arial">GWINDOW = solar shading factor of window only, which is constant (60% for example, which means that 60% of solar radiation goes through the window)</font></font></li>
<li><font size="-1"><font face="Arial">FS = solar shading factor of your system Window + Shadings. <br>FS depends on blinds use, <br></font></font></li>
<ul>
<li><font size="-1"><font face="Arial">if blinds are used, FS = 0.2 (for example) <br></font></font></li>
<li><font size="-1"><font face="Arial">if not, FS = GWINDOW</font></font></li></ul></ul><font size="-1"><font face="Arial">In that way, FS is calculated as the product between :</font></font>
<ul>
<li><font size="-1"><font face="Arial">the amount of solar energy which pass through external shading device when they're used => (1-ESHAD)</font></font><br></li>
<ul>
<li><font size="-1"><font face="Arial">ESHAD = 0 means no shading<br></font></font></li>
<li><font size="-1"><font face="Arial">ESHAD = 1 means zero transmission</font></font></li></ul>
<li><font size="-1"><font face="Arial">and window solar shading factor (GWINDOW) </font></font></li>
<ul>
<li><font size="-1"><font face="Arial"><b>FS = GWINDOW.(1-ESHAD)</b> (1)</font></font><br>Regarding (1)<font size="-1"><font face="Arial"><b> </b></font></font><br><font size="-1"><font face="Arial"><b>ESHAD = (1- FS/GWINDOW</b></font></font><b>) </b>(2)</li>
</ul></ul>No you have a relation between ESHAD, FS and Window G-Value :<br>
<ul>
<li><font size="-1"><font face="Arial">When blinds are up, solar radiation are only blocked by the window solar shading factor => FS = GWINDOW and </font></font><font size="-1"><font face="Arial">ESHAD = 0.</font></font></li>
<li><font size="-1"><font face="Arial">When blinds are down, solar radiation are blocked by window <b>and</b> external shadings => FS = 0.2 (for the whole system in that example), ESHAD = (1-0.2/0.6)</font></font> = 0.667 that means that 66.67% non transparent area of the shading device to the whole glazing area)<br>
Regarding (1) FS = 0.5*(1-0.0.667) = 0.5*0.4 = 0.2 which is the total shading factor you want.</li></ul>Best<br>
<div>
<hr align="left" color="#3300ff" size="2" width="450">
<table border="0">
<tbody>
<tr>
<td rowspan="3" width="120">
<center><a href="http://www.itf.biz/" target="_blank"> <img border="0" alt="www.itf.biz" src="cid:part1.07010703.03000805@itf.biz" width="66" height="103"></a><br><font color="#0000ff" size="1" face="CALIBRI"><a href="http://www.itf.biz/" target="_blank">www.itf.biz</a></font></center>
</td>
<td colspan="2"><font color="#000000" size="2" face="CALIBRI">Adrien JEZEQUEL<br>Simulations Thermiques Dynamiques</font></td></tr>
<tr>
<td align="left"><font color="#0000ff" size="4" face="CALIBRI"><b>ITF</b></font><br></td>
<td><font color="#0000ff" size="2" face="CALIBRI">62, Rue du Bolliet<br>73230 St Alban Leysse<br>FRANCE<br></font></td></tr>
<tr>
<td width="40" align="left"><font color="#0000ff" size="2" face="CALIBRI">Phone :<br>Fax :<br>Mail:<br></font></td>
<td><font color="#0000ff" size="2" face="CALIBRI">+33(0) 479 750 029<br>+33(0) 479 852 122<br><a href="mailto:a.jezequel@itf.biz" target="_blank">a.jezequel@itf.biz</a></font></td></tr></tbody></table><i><font color="#008000" size="1" face="CALIBRI">Afin de contribuer au respect de l'environnement, merci de n'imprimer cet e-mail que si nécessaire<br>
<font color="#008000" size="1" face="CALIBRI">Please, consider our environmental responsability before printing this email<br></font></font></i></div><br>Le 22/06/2010 14:04, Julie Lestrade a écrit :
<blockquote type="cite">
<div>
<div></div>
<div class="h5"><font size="2"><font size="2"><span style="COLOR: rgb(0,0,0)"><span style="FONT-FAMILY: Arial">Dear TRNSYS users,<br><br>I was wondering about blinds in front of windows and how to take them into account.<br>
In my case, they external blinds. They're up at certain time and down at other (depending on radiation on the wall, time of day, ...).<br><br>Should I take account of them in Type 56 ? on the windows considered with 'external shading factor' (that would be convenient since i can use a schedule) ? If yes, I would like to have a total solar factor for the window of 0.2 when the blind is down. Does that mean I should put a shading factor 0.8 ? or is it more complicated than that ?<br>
<br>Thank you for your answers<br><br>Julie <br><br></span></span></font></font><br></div></div>
<div>---------------------------------------------------------------------------------------<br>Orange vous informe que cet e-mail a été contrôlé par l'anti-virus mail.<br>Aucun virus connu à ce jour par nos services n'a été détecté.<br>
<br></div><br><pre><fieldset></fieldset>
_______________________________________________
TRNSYS-users mailing list
<a href="mailto:TRNSYS-users@cae.wisc.edu" target="_blank">TRNSYS-users@cae.wisc.edu</a>
<a href="https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users" target="_blank">https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users</a>
</pre></blockquote></div><br>_______________________________________________<br>TRNSYS-users mailing list<br><a href="mailto:TRNSYS-users@cae.wisc.edu">TRNSYS-users@cae.wisc.edu</a><br><a href="https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users" target="_blank">https://www-old.cae.wisc.edu/mailman/listinfo/trnsys-users</a><br>
<br></blockquote></div><br>