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<title>Exterior wall against ground</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Hello Daniel,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:navy'>The easiest way is to model the
ground using a ‘boundary’ with a constant temperature. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:navy'>The difficulty is in determining
the ground temperature.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:navy'>When the wall is thermally well
isolated, the ground temperature will roughly become equal to the annual average
ground temperature of the area (provided the wall is large enough for edge
effects to be negligible). <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:navy'>When the wall is not thermally
isolated, the ground temperature will gradually increase, and after a couple of
years the ground temperature just below the wall will get close to the average
temperature of the zone.(again neglecting edge effects) The heat loss will
become less every year.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
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face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
color:navy'>Arie <o:p></o:p></span></font></p>
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face=Arial><span lang=EN-GB style='font-size:10.0pt;font-family:Arial;
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<p class=MsoNormal><b><font size=2 face=Tahoma><span lang=EN-GB
style='font-size:10.0pt;font-family:Tahoma;font-weight:bold'>Van:</span></font></b><font
size=2 face=Tahoma><span lang=EN-GB style='font-size:10.0pt;font-family:Tahoma'>
Büchele Daniel (Helbling Beratung + Bauplanung)
[mailto:daniel.buechele@helbling.ch] <br>
</span></font><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>Verzonden:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> donderdag 12
april 2007 19:49<br>
<b><span style='font-weight:bold'>Aan:</span></b> trnsys-users@engr.wisc.edu<br>
<b><span style='font-weight:bold'>Onderwerp:</span></b> [TRNSYS-users] Exterior
wall against ground</span></font><o:p></o:p></p>
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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Hello
everybody</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Can
anyone, tell me whats the best way to simulate a external wall against the
ground.</span></font> <br>
<font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>How
can I define the ground ??</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Thanks
in advance</span></font> <o:p></o:p></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Mit
freundlichen Grüssen / Kind regards</span></font> <o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>Daniel
Büchele<br>
</span></font><font size=1 face=Arial><span style='font-size:7.5pt;font-family:
Arial'>Dipl. Ing. Gebäudeklimatik- / Technik</span></font> <br>
<font size=1 face=Arial><span style='font-size:7.5pt;font-family:Arial'>Projektleiter </span></font>
<o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p><b><font size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial;
font-weight:bold'>Helbling Holding AG<br>
</span></font></b><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hohlstrasse 614<br>
CH-8048 Zürich<br>
Telefon +41 44 438 18 64<br>
Mobile +41 79 641 44 03<br>
Telefax +41 44 438 18 10<br>
</span></font><a href="mailto:daniel.buechele@helbling.ch"><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial'>mailto:daniel.buechele@helbling.ch</span></font></a><u><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <</span></font></u><a
href="http://www.helbling.ch/"><font size=2 face=Arial><span style='font-size:
10.0pt;font-family:Arial'>http://www.helbling.ch</span></font></a><u><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'>></span></font></u>
<o:p></o:p></p>
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