[TRNSYS-users] Type 34 : strange output

[Diego A. Arias]

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 at 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 at 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 at yahoo.fr
>> > Date: Friday, April 7, 2006 5:11 am
>> > Subject: [TRNSYS-users] Type 34 : strange output
>> > To: trnsys-users at 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 at 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 at tess-inc.com
> Web Pages: http://www.tess-inc.com and http://www.trnsys.com
>
> "Providing software solutions for today's energy engineering projects"
> **************************************************************************************** 
>
>
>