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Abdullahi,<br>
You are correct that you should integrate with respect to depth
and calcuate the average. There is no simple way to do that directly in
Type77/501 at the moment. It is an interesting idea for future versions.
As a simple alternative, you can use the Kasuda depth for the middle of
the below grade section of the wall although it is not quite as
correct.<br>
Cheers,<br>
David<br><br>
<br>
At 12:27 4/13/2007, aa1@brighton.ac.uk wrote:<br>
<blockquote type=cite class=cite cite=""><font size=2>David/Daniel,<br>
<br>
My only concern with the use of Kasuda correlation (in the form used in
type 77 &Type 501) for vertical surfaces like a basement wall, is the
fact that these components will only give the soil temperature at a
single vertical point (say depth Z,Z<sub>1</sub>,Z<sub>2</sub> …..at any
given time). If your wall is very deep, say 1-2m deep, what you need is
probably the average temperature of a vertical profile ranging between
depth Z<sub>1</sub> and Z<sub>2. <br>
</sub> <br>
The way to go about this is to integrate the Kasuda expression with
respect to depth (Z<sub>1</sub> to Z<sub>2</sub>). My question to David
is whether this is achievable with Type77/501? If not perhaps Daniel
might want to look at the following document on how to integrate the
Labs/kasuda correlations. <br>
</font><font size=2 color="#000080"> <br>
</font><font face="Times New Roman, Times">Labs, K. 1989. Earth Coupling.
<u>Passive Cooling</u>. J. Cook. </font>Cambridge Massachusetts, The MIT
Press<b>: </b>197-346.<br>
<font face="Times New Roman, Times"> <br>
Abdullahi<br>
</font><font size=2 color="#000080"> <br>
</font><font face="Times New Roman, Times" size=2 color="#000080">School
of the Environment<br>
University of Brighton<br>
Cockcroft Building<br>
Lewes Rd.<br>
Brighton<br>
BN2 4GJ<br>
<br>
Tel: +44 01273 643455<br>
</font> <br>
<font face="Tahoma" size=2>-----Original Message-----<br>
<b>From:</b> David Bradley
[<a href="mailto:bradley@tess-inc.com" eudora="autourl">
mailto:bradley@tess-inc.com</a>] <br>
<b>Sent:</b> 13 April 2007 17:38<br>
<b>To:</b> Büchele Daniel (Helbling Beratung + Bauplanung);
trnsys-users@engr.wisc.edu<br>
<b>Subject:</b> Re: [TRNSYS-users] Exterior wall against ground<br>
</font><font face="Times New Roman, Times"> <br>
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><br>
Content-class: urn:content-classes:message<br>
Content-Type: multipart/alternative;<br>
<x-tab> </x-tab>
boundary="----_=_NextPart_001_01C77D2A.CB11DF05"<br><br>
</font><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>
http://www.helbling.ch</a></font> <font size=2>></u></font> <br><br>
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