[TRNSYS-users] Exterior wall against ground

[David Bradley]

Daniel,
   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.
Cheers,
  David


At 12:48 4/12/2007, Helbling Beratung + Bauplanung wrote:
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>
>Hello everybody
>
>Can anyone, tell me whats the best way to 
>simulate a external wall against the ground.
>How can I define the ground ??
>
>Thanks in advance
>
>Mit freundlichen Grüssen / Kind regards
>
>Daniel Büchele
>Dipl. Ing. Gebäudeklimatik- / Technik
>Projektleiter
>
>Helbling Holding AG
>Hohlstrasse 614
>CH-8048 Zürich
>Telefon +41 44 438 18 64
>Mobile  +41 79 641 44 03
>Telefax +41 44 438 18 10
><mailto:daniel.buechele at helbling.ch>mailto:daniel.buechele at helbling.ch 
><http://www.helbling.ch>
>
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>TRNSYS-users at engr.wisc.edu
>https://www.cae.wisc.edu/mailman/listinfo/trnsys-users

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David BRADLEY                           2916 Marketplace Drive - Suite 104
Partner                                        Madison, WI 53719
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