<BODY bgcolor='#ffffff'><font size="2"><h1 style="font-family: arial,helvetica; font-size: 10pt; font-weight: bold; color: black; background-color: rgb(238, 238, 238); padding-top: 3px; padding-bottom: 3px; margin-bottom: 1px;"><span style="font-weight: normal;">I asked about this before and I'm forwarding you the answer I got and was valid when i tested the influence of my blinds on the heating/cooling energy necessary for the building.</span></h1><span style="font-family: arial,helvetica;"><font size="2">hope this is useful.</font><span style="font-weight: bold;"><br><br></span>Best regards,<span style="font-weight: bold;"><br><br><br></span></span><h1 style="font-family: arial,helvetica; font-size: 10pt; font-weight: bold; color: black; background-color: rgb(238, 238, 238); padding-top: 3px; padding-bottom: 3px; margin-bottom: 1px;">Message
original Re : Re: [TRNSYS-users] Blinds</h1>
<font style="font-family: arial,helvetica; font-size: 10pt; color: black; background-color: white;"><b>De : </b>Adrien
JEZEQUEL - ITF <a class="moz-txt-link-rfc2396E" href="mailto:a.jezequel@itf.biz"><a.jezequel@itf.biz></a><br>
<b>A : </b><a class="moz-txt-link-abbreviated" href="mailto:trnsys-users@cae.wisc.edu">trnsys-users@cae.wisc.edu</a><br>
<b>Date</b> : 2010-06-22 15:44:27</font><br>
<br>
<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>
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<td colspan="2"><font face="CALIBRI" size="2" color="#000000">Adrien
JEZEQUEL<br>
Simulations Thermiques Dynamiques</font></td>
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Fax :<br>
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<i><font face="CALIBRI" size="1" color="#008000">Afin de contribuer
au
respect de l'environnement, merci de n'imprimer cet e-mail que si
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<font face="CALIBRI" size="1" color="#008000">Please, consider our
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<font face="Arial" size="2" color="#000000"><br><br><br></font></font><div><div style="background-color:white;"><p style="font-family: Verdana;" class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(36, 64, 97);">Julie LESTRADE </span></b><b><span style="font-size: 8pt; color: rgb(36, 64, 97);"><font size="2"> </font></span></b><br><b><span style="font-size: 8pt; color: rgb(36, 64, 97);">Ingénieur d'études </span></b><span style="font-size: 8pt; color: rgb(36, 64, 97);"></span><b style="font-family: Verdana;"><span style="font-size: 8pt; color: rgb(36, 64, 97);"><br></span></b><span style="font-size: 8pt; color: rgb(36, 64, 97);"></span></p><p style="font-family: Verdana;" class="MsoNormal"><span style="font-size: 8pt; color: rgb(36, 64, 97);"></span><span style="font-size: 8pt; color: rgb(36, 64, 97); font-family: Verdana;"></span><b style="font-family: Verdana;"><span style="font-size: 8pt; color: rgb(36, 64, 97);"><font size="2">CEDRE</font><br></span></b><span style="font-size: 8pt; color: rgb(36, 64, 97); font-family: Verdana;">Ophira 1, 1 Place Bermond<br>06560 SOPHIA-ANTIPOLIS<br>Tel : 04 92 96 03 77<br>Port : 06 45 68 07 53</span><b style="font-family: Verdana;"><span style="font-size: 8pt; color: rgb(36, 64, 97);"><br></span></b><br><span style="font-size: 8pt; color: rgb(36, 64, 97);"></span><b><span style="font-size: 8pt; color: rgb(36, 64, 97);"></span></b></p><p style="font-family: Verdana;" class="MsoNormal"><span style="font-size: 7.5pt; font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);"><img id="_x0000_i1072" src="../../DownloadDocuthequeFileServlet?downloadMailAttachment=image006.png@01CB589D.85323140" height="25" width="25" border="0"></span><span style="font-size: 7.5pt; font-family: "Arial","sans-serif"; color: rgb(31, 73, 125);"> </span><span style="font-size: 7.5pt; font-family: "Arial","sans-serif"; color: green;">Préservons
l'environnement, n'imprimez ce mail que si c'est nécessaire !</span><br><b><span style="font-size: 8pt; color: rgb(36, 64, 97);"></span></b></p><span style="font-size: 11pt; line-height: 150%;"><font style="color: rgb(65, 105, 225);" size="4"><span style="font-weight: bold; font-family: Arial;"><span style="color: rgb(100, 149, 237);"></span></span></font></span></div><BR><h1 style="font-family: arial,helvetica; font-size: 10pt; font-weight: bold; color: black; background-color: rgb(238, 238, 238); padding-top: 3px; padding-bottom: 3px; margin-bottom: 1px;">Message original Re : Re: [TRNSYS-users] external shading factor (multizone building)</h1><font style="font-family: arial,helvetica; font-size: 10pt; color: black; background-color: white;"><b>De : </b>Knut Erik Enerstvedt <knut.erik.enerstvedt@gmail.com><br><b>A : </b>joke.d@vkgroup.be<br><b>Date</b> : 2010-11-04 09:33:18</font><br><br></div><p class="MsoNormal"><span style="font-size: 9pt;">Joke,</span></p><p class="MsoNormal"><br></p><p class="MsoNormal">I think you should only consider the g-value of the shading device when calculating external shading factor. The g-value</p>
<p class="MsoNormal">of the window is handled separately. So if the g-value of your shading device is 0.23, the external shading</p><p class="MsoNormal">factor becomes 1 - 0.23 = 0.77.</p><p class="MsoNormal"><br></p><p class="MsoNormal">
Someone please correct me if I am wrong.</p><p class="MsoNormal"><br></p><p class="MsoNormal">Kind regards,</p><p class="MsoNormal">Knut Erik Enerstvedt<br></p><p class="MsoNormal"><br><span style="font-size: 9pt;"></span></p>
<p class="MsoNormal"><span style="font-size: 9pt;"><br></span></p><p class="MsoNormal"><span style="font-size: 9pt;">>Dear
trnsys-users,</span></p>
<p class="MsoNormal"><span style="font-size: 9pt;"> </span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US">>I’ve
a question about how to calculate the external shading factor (multizone
building). Is the following correct?</span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US">>Suppose
I’ve a window with a g-value of 0,37 and a g-value of 0,23 (external
shading device + window).</span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US">>The
external shading factor becomes then: 1 – (gwindow+shadingdevice/ gwindow)
= 1- (0.23/0.37) = 0.38</span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US">>Kind
regards,</span></p>
<p class="MsoNormal"><span style="font-size: 9pt;" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-size: 9pt; color: black;">>Joke De Beuckelaer</span></p>
<p class="MsoNormal"><span style="font-size: 9pt; color: black;">>project engineer mep</span></p>
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