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Re: [TRNSYS-users] Shading mask and control card

Hello Thibaut.
About the shading mask, to calculate quickly obstruction angles I often use a fish-eyes camera and I superimpose a solar diagram over the picture and then I just have to note obstruction angles. You just have to make sure, when you take the picture, that the camera is well horizontal, place the camera at mid height of the window and have a mark on the picture to know where the north is precisely.
About the error, it occurred to me once because I linked the incidence angle in type 56 from the output angle gives by type 68 which has nothing to do with the incidence angle, that have to be linked from type 109. But, this may not be your problem. Otherwise make sure that trnsys never calculate a negative beam or total radiation, in this case you have to make the output of type 67 go through an equation that take the maximum between 0 and the output.

I hope it could help

Valérie LEPRINCE (BULTEAU)
Doctorante
Ingénieur TPE/ MR en Génie Civil
LASH/DGCB
Ecole Nationale des Travaux Publics de l'Etat (ENTPE)
Rue Maurice Audin - 69518 Vaulx en Velin - France
Tel: +33 4 72 04 77 19
Fax: +33 4 72 04 70 40
E-mail: valerie.leprince@entpe.fr



-----Message d'origine-----
De : Thibaut VITTE [mailto:thibaut.vitte@h3c-energies.fr] 
Envoyé : lundi 17 novembre 2008 18:19
À : trnsys-users@cae.wisc.edu
Objet : [TRNSYS-users] Shading mask and control card

Dear Trnsys users,

I want to modelize a shading mask from a wall facing an opening. I 
understood how to use type67 (or 68, or 64?) and tested it, it seems to 
give good results.
But when I implemented this into my building simulation, I got an error 
(a warning that is repeated too many times) for type 56 "a direct beam 
radiation occured when the incidence angle was greater than 90° " 
(something like that). I've read that it can be due to the order in the 
control card (I checked with the TRACE function, and the inputs of type 
56 seems to be fine at the timesteps where an error's supposed to be). 
So I put type67 before type56, and I got an error #427 for type67.
 TRNSYS Message    427 : An OUTPUT from the specified component model 
has been written to the global OUT array in a location beyond the 
allocated number of outputs from this model. Please check the component 
carefully to insure that INFO(6) is set correctly. The simulation has 
been aborted to avoid problems caused by over-writing the outputs from 
other component models

Can anyone help me ?

Thibaut Vitte

PS: Since we're speaking of shading masks, does anyone has a good method 
to calculate fastly obstruction angles ? It can be time consuming...