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AW: Direct solar radiation Type 56

Hallo Torsten,

I am currently simulating an atrium with 4 zones. If the two bottom zones
are considered to be adjacent to the top zone there will be a heat transfer
via the internal glazing. I guess that the results would be wrong.

Cheers

Robert

*************************************************************

Steinbeis-Transferzentrum Energie-, Gebäude- und Solartechnik
TU Braunschweig - Institut für Gebäude- und Solartechnik
Dipl.-Ing. Robert Himmler
Mühlenpfordtstr. 23
38106 Braunschweig

Tel 0531/391-3563
Fax 0531/391-8125

robert.himmler@stz-egs.de
himmler@igs.bau.tu-bs.de

> -----Ursprüngliche Nachricht-----
> Von: owner-trnsys@relay.doit.wisc.edu
> [mailto:owner-trnsys@relay.doit.wisc.edu]Im Auftrag von hotline
> Gesendet: Mittwoch, 23. Juli 2003 11:28
> An: trnsys@relay.doit.wisc.edu
> Betreff: AW: Direct solar radiation Type 56
>
>
> Hello Christian and Michaël,
>
> sorry Michaël but this is not correct.
>
> With geosurf You can only distribute the direct solar radiation through
> 1 internal window and then to all surfaces in the second zone
> e.g. the office with a double facade.
> After a second internal window radiation is considered to be
> diffuse so Geosurf
> wont work for the third zone.
>
> If you want to do that like in a Atrium with 4 Zones you have to
> add at the 2 bottom zones a fictive
> internal window which is adjacent to the top zone.
>
> cheers
> Torsten Welfonder
>
>
> Mailto:Hotline@transsolar.com; http://www.transsolar.com
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> -----Ursprüngliche Nachricht-----
> Von: Michaël Kummert [mailto:kummert@engr.wisc.edu]
> Gesendet: Montag, 21. Juli 2003 16:22
> An: trnsys@relay.doit.wisc.edu
> Betreff: Re: Direct solar radiation Type 56
>
>
> The way I understand transmission through internal windows in Type 56,
> it is possible to have some direct solar radiation transmitted through
> several internal windows.
> However, your building (or whatever you want to simulate with Type 56)
> must be very special if that happens in reality. Assuming Type 56 really
> allows you to transmit direct radiation through 5 successive windows, I
> am not sure the results would be meaningful. You may need to use a
> different model (i.e. to write one yourself) to model the radiative
> exchanges more accurately. In any case I would run some simple
> steady-state cases and check the results.
>
> Regards,
>
> Michaël Kummert
>
> sim@energiebuero-berlin.de wrote:
>
> >Thank you Michaël,
> >but does Geosurf also work if I have 5 zones after each other, not only
> >two like a
> >double fassade? Is it possible to let direct solar radiation
> from outside pass trough first,
> >second, third and fourth zone and being absorbed on a surface in
> the fifth zone?
> >By Christian
> >
> >
> >
> >On 18 Jul 2003 at 12:05, Michaël Kummert wrote:
> >
> >
> >
> >>Dear Christian,
> >>If you are using TRNSYS 15, Type 56 allows you to model internal
> >>windows. You can also use the "GEOSURF" feature to control the
> >>distribution of incoming direct solar radiation. For instance, if you
> >>have a double façade building and the "inner skin" of the façade is
> >>fully glazed, you would typically set GEOSURF to 1 for the
> internal window.
> >>Please note that if you use very special windows you may have to tweak
> >>the transmittance of the internal window to obtain meaningful results
> >>(for instance, assume that a window has a transmittance of 1 in
> one part
> >>of the radiation spectrum and 0 in the other part, resulting in an
> >>overall transmission of 0.6. If you put 2 windows in series, the
> >>transmittance modeled by Type56 will be 0.6*0.6=0.36, while the "real"
> >>transmittance is 0.6 - you cannot filter the same part of the spectrum
> >>twice!).
> >>
> >>Regards,
> >>
> >>Michaël Kummert
> >>
> >>sim@energiebuero-berlin.de wrote:
> >>
> >>
> >>
> >>>Dear TRNSYS-Users,
> >>>I want to model a house, where a part of the incoming direct solar
> >>>radiation is absorbed by a wall and another part of this direct
> >>>radiation "flows" into the next (adjacent) zone and is absorbed
> >>>there. Is it possible to let solar direct radiation stream through one
> >>>zone into another?
> >>>Thanks for help!
> >>>Christian Stolte
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>energiebüro
> >>>Adalbertstr. 7-8
> >>>10999 Berlin
> >>>t: 030-68056011
> >>>f: 030-68056013
> >>>www.energiebuero-berlin.de
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>--
> >>_________________________________________________
> >>
> >>Michaël Kummert
> >>
> >>Solar Energy Laboratory - University of Wisconsin-Madison 1303 Engr
> >>Res Bldg, 1500 Engineering Drive Madison, WI 53706
> >>
> >>Tel: +1 (608) 263-1589
> >>Fax: +1 (608) 262-8464
> >>E-mail: kummert@engr.wisc.edu
> >>
> >>SEL Web Site: http://sel.me.wisc.edu
> >>TRNSYS Web Site: http://sel.me.wisc.edu/trnsys
> >>
> >>
> >>
> >>
> >
> >
> >
> >
> >
>
> --
> _________________________________________________
>
> Michaël Kummert
>
> Solar Energy Laboratory - University of Wisconsin-Madison
> 1303 Engr Res Bldg, 1500 Engineering Drive
> Madison, WI 53706
>
> Tel: +1 (608) 263-1589
> Fax: +1 (608) 262-8464
> E-mail: kummert@engr.wisc.edu
>
> SEL Web Site: http://sel.me.wisc.edu
> TRNSYS Web Site: http://sel.me.wisc.edu/trnsys
>