[TRNSYS-users] WG: 2nd error generating shading/insolation matrix -> too many shaders on projection plane

Thu May 19 01:28:01 PDT 2011

Dear Joke,

the previous email was sent accidentally. I didn't finish typing the 
equation. Please delete the previous one.

I debugged your project and it turns out that there are too many shaders 

projected on the plane window/wall plane for clipping.
The shading routine isn't designed to calculate each lamella of a louver 

for each window of a building. In addition each of your lamellas consist 

of 6 surfaces. This results in 3040 shading surfaces!!!!

The solution is simplification without a significant loss of accuracy 
(see attached image):
- delete all shading louvers except one for each orientation
- replace the six surfaces of a lamella by one sloped surface (the 
diagonal
  surface in the shading box).

For these windows a shading matrix is calculated und the shading is 
calculated automatically.

For the other windows you set the external shading factor to an input.
You define Ntype 103 (IBSHAD) and Ntype 104 (IDSHAD) for the windows 
with the shading matrix. For each orientations this input is calculated 
by an equation in the TRNSYS Project file

SHAD_ x_y_z = 1 - (IBSHAD+IDSHAD)/Window_area /IT_x_y_z  
  with
IT_x_y_z  ... total incident radiation on kJ/hr on orientation x_y_z

If you still have trouble, please send me your IDF file.

Kind regards,

Marion

Dipl.-Ing. Marion Hiller 
TRANSSOLAR: KlimaEngineering - Technologien für energieeffizientes Bauen 

und Nutzerkomfort in Gebäude 
Munich - New York - Stuttgart + 49.711.67976.0 

Transsolar Energietechnik GmbH, Curiestrasse 2, 70563 Stuttgart 
Amtsgericht Stuttgart - HRB 23347, Steuernummer 99073/00911, USt-IdNr.: 
DE152272639
Geschäftsführer: Dipl.Ing. Matthias Schuler, Dipl.Ing. Thomas Auer, 
Dipl.Phys. Stefan Holst, Prof. Dipl.-Ing. Bleicher 

-----Ursprüngliche Nachricht-----
Von: Joke De Beuckelaer [mailto:joke.d at vkgroup.be] 
Gesendet: Donnerstag, 19. Mai 2011 08:09
An: Marion Hiller
Cc: TRNSYS-users
Betreff: RE: Re: [TRNSYS-users] Error: generating shading/insolation 
matrix

Dear Marion,

It's strange that the error occurs because the surface number>999. When 
I deleted all the shading except 1 rectangle, the same error occurred. 
Or is this number (999) with the surfaces of the model included?

In attachment you can find the original idf file. Normally I've send all 

my files already, didn't you receive them?

I'm working with Trnsys version 17.00.0018.

Thanks a lot already for all your help and I hope you can find the 
problem,
Kind regards,

Joke De Beuckelaer
project engineer mep

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-----Oorspronkelijk bericht-----
Van: Marion Hiller [mailto:hiller at transsolar.com]
Verzonden: dinsdag 17 mei 2011 13:27
Aan: Joke De Beuckelaer
CC: TRNSYS-users
Onderwerp: AW: Re: [TRNSYS-users] Error: generating shading/insolation 
matrix

Joke,

the error message is due to too surface numbers > 999. The surface
number can't be written in the log file (artsmetiers7_shd.log) and ***
are written instead.

*** Notice at time        :         0.000000
 Orientation of wall   SURF=***: azimuth angle= 180.00°, slope=  90.00°
 Orientation of wall   SURF=***: azimuth angle=   0.00°, slope=   0.00°

In order to see why the surface numbers are so high (starting with
3993 instead of 1) I need to need the original *.idf and check the
import function.

With what version of TRNSYS17 are you working? I have in mind that we
fixed such a bug created by the import.

Kind regards,

Marion

-----Ursprüngliche Nachricht-----
Von: Joke De Beuckelaer [mailto:joke.d at vkgroup.be]
Gesendet: Donnerstag, 12. Mai 2011 08:58
An: duffy at tess-inc.com; trnsys-users at cae.wisc.edu
Betreff: Re: [TRNSYS-users] Error: generating shading/insolation matrix

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