[esp-r] Re: solar obstruction and long wave radiation

[Hannah Neumann]

Dear Achim,

thank you very much!

Your second answer sounds as if it is possible to change the view 
factors of lang wave radiation to the sky, the surroundings and the 
ground once before starting a simulation. Do I understand this correctly?
If yes, how can I change these view factors?

Best regards,
Hannah


Geissler Achim wrote:
> Dear Hannah
> 
> to my knowledge the answer to both questions is "no". 
> 
> The obstructions do not have a temperature, so, calculation of long wave radiation exchange with an external surface is not possible. The material one can attribute to the obstructions is used only for export to Radiance, as far as I am aware.
> 
> External long wave radiation is split according to the settings in "sky, ground, surrounding". Sadly, I think, these settings can be set only once, i.e., they are valid for all (external) elevations of a model.
> 
> Best
> Achim
> 
> 
>> -----Ursprüngliche Nachricht-----
>> Von: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-
>> bounces at lists.strath.ac.uk] Im Auftrag von Hannah Neumann
>> Gesendet: Freitag, 29. Juni 2012 10:54
>> An: esp-r at lists.strath.ac.uk
>> Betreff: [esp-r] solar obstruction and long wave radiation
>>
>> Dear all,
>>
>> I have created a solar obstruction in my model, which decreases the amount
>> of short wave radiation from the sun reaching the zone.
>>
>> When analyzing the results another interesting question came up:
>> Does a solar obstruction also have influence on long wave radiation?
>> Means is long wave radiation between my building outer wall and the solar
>> obstruction calculated?
>> And does the implementation of a solar abstruction lead to less long wave
>> radiation to the sky?
>>
>> Thanks and regards,
>> Hannah
>>
>>
>>
>>
>> --
>> Dipl.-Ing. (FH) Hannah Neumann
>> Division Thermal Systems and Buildings
>> Fraunhofer Institut für Solare Energiesysteme ISE Heidenhofstraße 2, 79110
>> Freiburg, Germany
>> Phone:  +49 (0) 7 61/ 45 88 - 54 31    Fax:  +49 (0) 7 61/ 45 88 - 91 32
>> hannah.neumann at ise.fraunhofer.de
>> www.ise.fraunhofer.de
>>
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> 
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-- 
Dipl.-Ing. (FH) Hannah Neumann
Division Thermal Systems and Buildings
Fraunhofer Institut für Solare Energiesysteme ISE
Heidenhofstraße 2, 79110  Freiburg, Germany
Phone:  +49 (0) 7 61/ 45 88 - 54 31    Fax:  +49 (0) 7 61/ 45 88 - 91 32
hannah.neumann at ise.fraunhofer.de
www.ise.fraunhofer.de