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Re: [TRNSYS-users] Shadings, walls and windows

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@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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