[TRNSYS-users] Why is IB_N = Input9 * LT(AI_N, 90) in the wizard for Building Project, when Inpu9 is the beam radiation from type109

[David Bradley]

Alfred,
  The equation IB_N will have the value if Input9 (which is presumably 
the beam radiation of tilted surface-1) as long as the angle of 
incidence of beam radiation on surface 1 (AI_N) is less than 90 degrees. 
It is a way of making sure that Type109 doesn't pass solar radiation to 
the building when the beam radiation is behind the plane of the building 
surface. The equation should not be necessary; I have never needed to 
use an equation like that. It has always been sufficient to make sure 
that the weather data component appears before the building in the input 
file. To change the input file order, go to the component control cards 
icon (where you set the simulation start and stop times)
Kind regards,
 David


Alfred Haider wrote:
> Hello,
>
> today I got the 16.1 TRNSYS.
> I tested the project wizard to build a simple building project.
> When finished the data from type109 will go through a Equa called 
> "Radiation"
> There is a formula I don't understand.
> IB_N = Input9 * LT(AI_N,90)
>
> Why is the "beam radiation of titled surface-1" 'North' (input9) 
> multiplied with LT(AI_N,90) to get IB_N. I tought "beam radiation of 
> titled surface-1" is the IB_N
>
> And why only North. Every other orientation gets simple the data from 
> type109 without modification.
>
> Hope someone can help me.
>
> bye,
>      Alfred
>
>
>
>
>
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>
>   

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