AW: Direct solar radiation Type 56

["hotline" <hotline@xxxxxxxxxxxxxx>]

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


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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