Re: [TRNSYS-users] Type 34 : Strange outputs

["Diego A. Arias" <daarias@wisc.edu>]

Hi Jeff,

I wonder if you also modified the values of the left and right 
wingwalls. By default, Type34 assigns values of 0.5m to all of the 
dimensions. I am sending you in another email a project with Type34 
where you can see that when the projections are equal to zero, the 
incoming diffuse and beam radiation are kept constant by Type34.

jfamailbox-i3er@yahoo.fr wrote:

> Hi all,
> Many thanks to David and Diego,
> I understand known the outputs, but I'm not very fond
> to change type 109 parameters and losses Perez sky
> accuracy.
> So, I’ve tried a mask but results seems not better (In
> fact worth! ). Solar gain are closer no shading device
> configuration than type34.
> Two remarks coming from that:
> 1-	I lose 4% of solar gain by using isotropic sky (via
> Type 34) (Result from overhang set to zero and compare
> without type 34).
>  
Type34 assumes an isotropic sky model. Therefore, if you want to be 
entirely consistent, you may want to use this model in your radiation 
processor.

> 2-	Result with mask are very far reality!
>
> Two questions:
> 1-	How can have accurate solar gain with a shading
> device close than window.
> 2-	Is it possible to use mask for closer shading
> (General idea is to use SIMCAD to make building
> description and masks and avoid many type 34 use).
>  
I am not sure if I understand your last question. Do you want to use a 
shading mask in order to model the overhangs and wingwalls? Remember 
that the information given in a shading mask is the height angles formed 
between the horizontal line and the height of the obstruction.
Please let me know if this answers your question.
Best regards,

Diego

> Linked Solar gain results
>
> Best regard
> JeFF
>
> ------------->JeFF
>
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