[TRNSYS-users] About Shading masks (type 67) and Overhang and wingwalls shading (type 34)

Dear TRNSYS users, I have some questions for you :

1°) I try to use the type 67 with the type 56a (Multizone Building).

But, it seems to me that I must used the type 34 in complement.

[Output 11 of type 34 (Fraction of solar shading) ---> Input of type 56a (created by me to used in Input of External Shading Factor)]

because the type 67 gives me 2 outputs (among 11) :

[Output 7 of type 67 (Fraction of beam visible on horizontal for mask) ---> ?

[Output 9 of type 67 (Fraction of diffuse visible on horizontal for mask) ---> ?

that I don't know used with the type 56a directly.

2°) I have read the files of the forum and I try the solution proposed by Diego (Wed Oct 26 2005) to Amelie Mariller

who recommend to use two type 68 (one horizontal and one vertical) with each type 34.

So, I have created two files in ".dat" :

the first with a slope of 0°

and the second with a slope of 90°.

The two files dividing the same others informations.

But I have the message : Error "Unable to read mask file, please check file syntax and format." when I launch the calculs.

3°) So, I use only one type 68 with one type 34 :

[Output 3 of type 67 Shaded beam radiation for surface ---> Input 5 of type 34 (Beam radiation on surface)]

[Output 10 of type 67 Shaded diffuse radiation on horizontal for mask ---> Input 4 of type 34 (Horizontal diffuse radiation)]

[Output 11 of type 67 Shaded total radiation on horizontal for mask ---> Input 3 of type 34 (Total horizontal radiation)]

Parameter 1 of type 34 Upstream component mode = 1 and not 0

In more, I use two Equations :

a) Equation 1 :

Sky diffuse radiation on titled surface i (Output of type 109)

Groung reflected diffuse radiation on titled surface i (Output of type 109)

Diffuse radiation for opening (Input 6 of type 67)

b) Equation 2 :

Sky diffuse radiation on horizontal

Groung reflected diffuse radiation on horizontal

Diffuse radiation on horizontal (Input 4 of type 69b and Input 4 of type 67)

After simulation, I have controlled the five View factor (Outputs 6,7,8,9,10 of type 34) by Online plotter (type 65d)

and I'm surprise because the sum is not equal to 1 !

But if I change :

Parameter 1 of type 34 Upstream component mode = 0 and not 1

the sum is correct.

Anyone knows what I should do? Thanks.

Fabien Morice.