[TRNSYS-users] Shading factors

[Manfred Schindler]

Hey David,

 

first, thanks for the answer. I solved the problem now and want to let
everybody know the solution, if somebody wants to walk the same path.

Your way of thinking was mine as well – so I knew that the requirement for
convex zones only applies to the detailed radiation modes, but in all the
documentations is written that in order to generate a shm-file, the detailed
model for beam radiation distribution has to be activated. If I do that, I
can’t even generate the shading/insolation matrix, because it is one button
for both ism and shm file and the result is an error message („The internal
solar distribution did not sum up 1. Make sure that the zones with detailed
beam radiation mode are CONVEX and CLOSED!!”), due to concave zone. So I
tried to generate the shading/insolation file with the standard mode and I
received the shm-File. But I didn’t know, if the matrix was taken into
account in the simulation. I simulated once with shm file in the directory
and once without à there was a difference in radiation on the window.

So: also with standard mode for beam radiation distribution the shm-matrix
is used by the simulation, you just have to generate it in advance.

Best regards,

Manfred

 

Von: David BRADLEY [mailto:d.bradley at tess-inc.com] 
Gesendet: Mittwoch, 11. August 2021 15:42
An: TRNSYS users mailing list at OneBuilding.org
<trnsys-users at lists.onebuilding.org>
Cc: Manfred Schindler <ma0022 at technikum-wien.at>
Betreff: Re: [TRNSYS-users] Shading factors

 

Manfred,

 I believe that the requirement for convex zones only applies to using the
detailed radiation mode to deal with the interior radiation exchange. In
other words I think it applies only to the *.vfm file and not to the *.shm
file since the *.shm file deals with shading on the outside of the building.
Please someone correct me if I am wrong about that.

kind regards,

 David

 

On 08/11/2021 04:41, Manfred Schindler via TRNSYS-users wrote:

Hello everyone,

 

I use trnsys3D to import to TRNBuild and I have a few shading objects. In
the existing model I just used shading factors from PHPP, only differencing
between summer and winter. Now I want to have more detailed shading factors
and want to use the shading matrix (shm) but as I read in the documentations
I need convex zones for it. Or is it working with concave zones, if I just
use the detailed radiation model for the beam radiation distribution (and
for the diffuse radiation distribution and the longwave radiation exchange
within a zone the standard models)? As far as I can see the geometry of a
zone is indifferent for the shm-File – isn’t it?

 

If it really does not work like that, my idea was to build up the same
3D-Modell but with only fictitious concave zones, so I could get the shading
factors in the shm-file. Is there any type I can use to read the shm-matrix
into my simulation with the concave zones?

 

Big thanks in advance!

Best regards,

Manfred Schindler





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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
3 North Pinckney Street - suite 202
Madison, WI  53703 USA
 
P:+1.608.274.2577
d.bradley at tess-inc.com <mailto:d.bradley at tess-inc.com> 
 
http://www.tess-inc.com
http://www.trnsys.com
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