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...