<BODY bgcolor='#ffffff'><font size="2"><font size="2"><span style="color: rgb(0, 0, 0);"><span style="font-family: Arial;">Hello </span></span></font><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;">Mariëlle <br><br>Thank you for your quick answer.<br><br>1) For this question I do understand this in principle but I don't see how/when TRNSYS is considering it. By the way, what about the capacitance ? is the default value calculated by TRNSYS a good one ? <br><br>2) I understood I could do that, but it's calculated by default and I don't particularly know the solar absorbance of the material. So I was wondering if the calculation was alright ?<br><br>3) Thank you for that one : really helpful ! <br><br>4) Anyone ? <br><br>5) Yes I'm adding a question here : for the ground definition, it is important to set the temperature of the earth below. By default it's 15°C. Does anybody know for which region of the world this is true ? <br><br>Thank you again.<br><br>Julie<br></span></font><font face="Arial" size="2" color="#000000"><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<br>Ingénieur d'études<br><br><font size="2">CEDRE</font><br></span></b><span style="font-size: 8pt; color: rgb(36, 64, 97);">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><span style="font-size: 8pt; color: rgb(36, 64, 97);"><br><br></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);"><font size="2"><br></font></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] Wall definition</h1><font style="font-family: arial,helvetica; font-size: 10pt; color: black; background-color: white;"><b>De : </b>Mariëlle Nuchelmans <M.Nuchelmans@chri.nl><br><b>A : </b>Julie Lestrade <lestrade.julie@cedre-sophia.com>, "trnsys-users@cae.wisc.edu" <trnsys-users@cae.wisc.edu><br><b>Date</b> : 2010-07-12 13:03:15</font><br><br></div>
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<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;">Hello Julie,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;">Some answers:<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
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<li class="MsoNormal" style="color: navy;"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">If there is thermal mass, it is important (heat accumulation). In
your case, with isolation at the outside, you will have thermal mass. If
you add a wall to a zone, the inside of the wall is in your zone, the
outside not.<o:p></o:p></span></font></li>
</ol>
<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
<ol style="margin-top: 0cm;" start="2" type="1">
<li class="MsoNormal" style="color: navy;"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">In your wall definition screen, there you can add the solar
absorbance (characteristic of the material)<o:p></o:p></span></font></li>
</ol>
<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
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<li class="MsoNormal" style="color: navy;"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial;" lang="EN-GB">If goesurf is set to zero, the incoming solar radiation is
distributed to all the walls in the zone. If you change geosurf (say 0,3
to one wall, and 0,7 to the others) Then the wall with geosurf 0,3 gets
30% of the incoming radiation.<o:p></o:p></span></font></li>
</ol>
<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;">Kind regards,<o:p></o:p></span></font></p>
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<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
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<p class="MsoNormal"><font face="Arial" size="2" color="navy"><span style="font-size: 10pt; font-family: Arial; color: navy;">Mariëlle Nuchelmans<o:p></o:p></span></font></p>
<p class="MsoNormal"><font face="Times New Roman" size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma; font-weight: bold;">Van:</span></font></b><font face="Tahoma" size="2"><span style="font-size: 10pt; font-family: Tahoma;"> Julie Lestrade
[mailto:lestrade.julie@cedre-sophia.com] <br>
<b><span style="font-weight: bold;">Verzonden:</span></b> maandag 12 juli 2010
13:53<br>
<b><span style="font-weight: bold;">Aan:</span></b> <st1:personname w:st="on">trnsys-users@cae.wisc.edu</st1:personname><br>
<b><span style="font-weight: bold;">Onderwerp:</span></b> [TRNSYS-users] Wall
definition</span></font><o:p></o:p></p>
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<p class="MsoNormal"><font face="Times New Roman" size="3"><span style="font-size: 12pt;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font face="Arial" size="2" color="black"><span style="font-size: 10pt; font-family: Arial; color: black;">Dear Trnsys users,<br>
<br>
I was wondering about some details in the wall definition. <br>
<br>
1) Usually, the building I represent is insulated from the outside. When I
choose the layer that compose my wall I have an order (inside toward outside).
I was wondering if there was any importance in that ? Because it did not seem
to me that trnsys took into account the thermal bridges ? am I wrong ? <br>
<br>
2) how can we choose the solar absorbance of the wall ? is it calculated ? if
yes how ? if not how is it determined ? how can we determine it ?<br>
<br>
3) I read somewhere here that the geosurf should be set to 0. am I right ? if
yes why is that ? if not how do we choose the repartition ?<br>
<br>
4) What about the wall gain parameter ? I notice it is set to 0 by default and
in my results, the solar gains are equal to zero if there is no windows. Is
that because my wall gain is zero ? To my mind it's not really representative
of the reality. Should I put a wall gain different from 0 ? if yes how do I
choose ? <br>
<br>
Thank you for your feedbacks ! <br>
<br>
Julie</span></font><o:p></o:p></p>
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<p class="MsoNormal" style="background: white none repeat scroll 0% 0%; margin-bottom: 12pt; -moz-background-clip: border; -moz-background-origin: padding; -moz-background-inline-policy: continuous;"><b><font face="Verdana" size="1" color="#244061"><span style="font-size: 8pt; font-family: Verdana; color: rgb(36, 64, 97); font-weight: bold;">Julie
LESTRADE<br>
Ingénieur d'études<br>
<br>
</span></font></b><b><font face="Verdana" size="2" color="#244061"><span style="font-size: 10pt; font-family: Verdana; color: rgb(36, 64, 97); font-weight: bold;">CEDRE</span></font></b><b><font face="Verdana" size="1" color="#244061"><span style="font-size: 8pt; font-family: Verdana; color: rgb(36, 64, 97); font-weight: bold;"><br>
</span></font></b><font face="Verdana" size="1" color="#244061"><span style="font-size: 8pt; font-family: Verdana; color: rgb(36, 64, 97);">Ophira 1, 1 Place
Bermond<br>
06560 SOPHIA-ANTIPOLIS<br>
Tel : 04 92 96 03 77<br>
Port : 06 45 68 07 53</span></font><font face="Verdana"><span style="font-family: Verdana;"><o:p></o:p></span></font></p>
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