[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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



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
> >
> >
> >
> >
> >
> >
> >
>
___________________________________________________________________________
>
> > Nouveau : téléphonez moins cher avec Yahoo!
> Messenger ! Découvez
> > les tarifs exceptionnels pour appeler la France et
> l'international.
> > Téléchargez sur http://fr.messenger.yahoo.com
> >
>






___________________________________________________________________________ Nouveau : téléphonez moins cher avec Yahoo! Messenger. Appelez le monde entier à partir de 0,012 €/minute !
Téléchargez sur http://fr.messenger.yahoo.com
_______________________________________________
TRNSYS-users mailing list
TRNSYS-users@engr.wisc.edu
https://www.cae.wisc.edu/mailman/listinfo/trnsys-users


****************************************************************************************
Thermal Energy System Specialists (TESS), LLC
David BRADLEY 2916 Marketplace Drive - Suite 104
Partner Madison, WI 53719
Phone: (608) 274-2577 USA
Fax: (608) 278-1475
E-mail: bradley@tess-inc.com
Web Pages: http://www.tess-inc.com and http://www.trnsys.com

"Providing software solutions for today's energy engineering projects"
****************************************************************************************