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Daniel,<br>
Arie's response is quite correct. Additionally, if you do not want
to use the annual ambient temperature as your boundary wall temperature,
you can use the temperature of undisturbed ground as calculated by the
Kasuda correlation from Type77. This makes the ground temperature a
function of depth and time of year. Like with Arie's response, it assumes
that the ground is an infinite source / sink and that energy transferred
from the building through the wall to the ground does not affect the
ground temperature in the long term. We have written a few basement
models recently that do account for the change in the ground temperature
due to energy transfer through the wall but they assume four basement
walls and a floor. If you only have one wall below grade then you might
be best off using Arie's method either with the annual average ground
temperature or with Type77.<br>
Cheers,<br>
David<br><br>
<br>
At 12:48 4/12/2007, Helbling Beratung + Bauplanung wrote:<br>
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urn:content-classes:message<br>
Content-Type: multipart/alternative;<br>
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boundary="----_=_NextPart_001_01C77D2A.CB11DF05"<br><br>
<font size=2>Hello everybody</font> <br><br>
<font size=2>Can anyone, tell me whats the best way to simulate a
external wall against the ground.</font> <br>
<font size=2>How can I define the ground ??</font> <br><br>
<font size=2>Thanks in advance</font> <br><br>
<font size=2>Mit freundlichen Grüssen / Kind regards</font> <br><br>
<font size=2>Daniel Büchele<br>
</font><font size=1>Dipl. Ing. Gebäudeklimatik- / Technik</font> <br>
<font size=1>Projektleiter </font> <br><br>
<font size=2><b>Helbling Holding AG<br>
</b>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>
</font><font size=2 color="#0000FF"><u>
<a href="mailto:daniel.buechele@helbling.ch">
mailto:daniel.buechele@helbling.ch</a></font><font size=2>
<</font><a href="http://www.helbling.ch/" eudora="autourl">
<font size=2 color="#0000FF">http://www.helbling.ch</a></font>
<font size=2>></u></font> <br><br>
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