Re: [TRNSYS-users] Type 34 : strange output

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

Hi Jeff,
Sorry if my answer was not helpful. Thanks, Dave for your help.
Jeff, please let us know if this solves your problem.
Best regards,

Diego

David Bradley wrote:

> Jeff,
> I ran into the same problem a few years ago. After much searching, I 
> realized that Type34 assumes an isotropic sky for diffuse radiation. 
> If you have your Type109 set to use an anisotropic sky model, you can 
> actually get more radiation on a "shaded" surface that has a non 
> projecting overhang or wingwalls. If you change Type109 parameter 3 to 
> "1" the problem should go away.
> Kind regards,
> David
>
>
> At 10:39 4/7/2006, jfamailbox-i3er@yahoo.fr wrote:
>
> > Dear Diego,
> > Thanks for your answer, but it's not more clear for
> > me, because I'put FSKY to 0.5 in my BUI, so results
> > should be the same ?
> > Regards,
> > JeFF
> > --- DIEGO A ARIAS <daarias@wisc.edu> a écrit :
> >
> > > Dear Jeff,
> > >
> > > The mathematical description of Type34 (Volume 5,
> > > section 5.7.15)
> > > explains that type 34 calculates the view factor for
> > > the opening to the
> > > sky. The view factor for an unshaded vertical
> > > surface is 0.5. The
> > > presence of wingwalls or overhang reduce the view
> > > factor.
> > > If you have an unshaded surface (overhang projection
> > > equal to zero),
> > > type 34 will use a shading factor equal to 0.5.
> > > Please let me know if this answers your question or
> > > if you have any
> > > additional questions.
> > > Best regards,
> > >
> > > Diego
> > >
> > > ----- Original Message -----
> > > From: jfamailbox-i3er@yahoo.fr
> > > Date: Friday, April 7, 2006 5:11 am
> > > Subject: [TRNSYS-users] Type 34 : strange output
> > > To: trnsys-users@engr.wisc.edu
> > >
> > > > Hello TRNSYS users,
> > > > I've done simulations of simple room with a window
> > > > south oriented and several overhang (type 34)
> > > > settings.
> > > > And I?ve different value without type 34(directly
> > > > connected to type 109) and connected to type 34
> > > with
> > > > overhang projection set to zero !!!
> > > > Someone could explain it ?
> > > > I linked TPF file
> > > >
> > > > Regards,
> > > > JeFF
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > >
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> >
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