[TRNSYS-users] Shadings, walls and windows

[David BRADLEY]

Martin,
   I would add to Ewen's response with a clarification that what you 
have to add in Trnsys3D is a series of shading objects sticking out like 
fins perpendicular to the perimeter of the window. Do not try and draw 
the actual thickness of the wall in Trnsys3D; the T3D model is a wire 
frame model.

  A few other words of caution here as well. First, 50cm thick walls 
have so much mass in them that they can give TRNBuild a lot of trouble 
when it tries to come up with a representative transfer function. I 
would try and specify those walls very early in the process so that you 
do not waste a lot of time constructing a model that will not work later 
on. Second, before you draw a whole lot of shading objects, consider the 
use of Type34 instead. If all the windows are the same size and face the 
same direction, the shading effect of the thick wall can be computed 
using a single Type34 and then passing the shaded radiation to Type56 as 
the solar radiation falling on each of the windows. Note that you will 
have to assign a different ORIENTATION to the windows in TRNBuild.
Kind regards,
  David


On 5/23/2013 10:11, Ewen wrote:
> Hy Martin,
> I would say that you are right. You need to draw the thickness of the 
> walls on T3D by adding shading surfaces around the window.
>
> Best,
> Ewen Raballand
>
> Le 23 mai 2013 à 15:40, "Martin Schmelas" 
> <Martin.Schmelas at hs-offenburg.de 
> <mailto:Martin.Schmelas at hs-offenburg.de>> a écrit :
>
>> Dear TRNSYS users,
>>
>> I have a question about shadings, walls and windows.
>>
>> I built up a 3D model in TRNSYS3D. For the surface dimensions I used 
>> for every wall the centerline. The exterior walls have a lot of 
>> windows. I know the thickness of the walls can be defined in TRNBUILD.
>>
>> For example the exterior wall has a thickness of 50 cm and the 
>> windows are located at the inside dimension, how is the shading from 
>> the wall considered?
>>
>> Do I have to implement in TRNSYS3D shading groups with the dimension 
>> of 50 cm around the windows?
>>
>> Thanks
>>
>> Martin
>>
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>
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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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