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

[Geissler Achim]

Dear Hannah

in the menu <browse edit simulate> <model context> you find <exposure>. Here, you can choose "user defined" and enter the three values. In .cfg it looks like this:

======
47.540    7.580   # Latitude & Longitude (diff from time meridian)
      8   0.200   # Site exposure & ground reflectivity
   0.400   0.200   0.400   # views to sky ground buildings
======

The "sum must be one" seems to be a bit finicky, so maybe entering the values in the .cfg directly is quicker.

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: Mittwoch, 4. Juli 2012 17:13
> An: Geissler Achim
> Cc: esp-r at lists.strath.ac.uk
> Betreff: [esp-r] Re: solar obstruction and long wave radiation
> 
> 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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> >> esp-r at lists.strath.ac.uk
> >> http://lists.strath.ac.uk/mailman/listinfo/esp-r
> >
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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
> 
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