[TRNSYS-users] bug in type 34?

[Adriana Angelotti <Adriana.Angelotti@polimi.it>]

Dear trnsys users and developers,

by checking type 34 (Overhang and Wingwall Shading) I found a possible
bug in the calculation of the global radiation incident on a vertical
unshaded surface.

It's calculated as:

GTOT=(GB+GD*0.5d0+RHO*GR)    (with GB=beam rad; GD= diffuse rad on horizontal; GR=total rad on horizontal)

while I think there should be a ground view factor=0.5 taken into
account, so that:

GTOT=(GB+GD*0.5d0+0.5d0*RHO*GR)

GTOT is used in the fraction of solar shading calculation.

Is there anybody who can say what is right?

Thanks in advance

Adriana




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Adriana Angelotti
Politecnico di Milano
Dipartimento di Scienza e Tecnologie dell'Ambiente Costruito (Best)
v. Bonardi 3
20133 Milano, Italy
Ph    +39 02.2399.5183
Fax  +39 02.2399.5118
e-mail adriana.angelotti@polimi.it