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Re: [TRNSYS-users] bug in type 34?

Dear Adriana,
You are right, the total radiation should consider the ground view factor. This will be included in the next release. 
Best regards,

Diego

Adriana Angelotti wrote:


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




--------------------------------------------------------------------------------------------------
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

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