[Radiance-general] Satel-light data into gendaylit

[John Ford]

Ah, thank you. Will read the manual next time...

John. 



On 06/11/2011, at 10:11 PM, Jan Wienold wrote:

> Hi john,
> 
> you find the answer directly in the gendaylit man page or just by typing
> gendaylit, you just have to use the -G option - see below.
> 
> Jan
> 
> 
> 
> gendaylit
> gendaylit: Use error - arg count
> Usage: gendaylit month day hour [-P|-W|-L] direct_value diffus_value
> [options]
> or   : gendaylit -ang altitude azimuth [-P|-W|-L] direct_value
> diffus_value [options]
>        -P epsilon delta  (these are the Perez parameters)
>        -W direct-normal-irradiance diffuse-horizontal-irradiance (W/m^2)
>        -L direct-normal-illuminance diffuse-horizontal-illuminance (lux)
>        -G direct-horizontal-irradiance diffuse-horizontal-irradiance
> (W/m^2)
>        -O [0|1|2]  (0=output in W/m^2/sr visible, 1=output in W/m^2/sr
> solar, 2=output in candela/m^2), default is 0
> 
> 
> John Ford wrote:
>> Hi, 
>> 
>> Wondering if anyone else is using Satel-light data with gendaylit. I seem to only be able to get direct horizontal irradiance (Ees, according to the glossary) rather than direct normal irradiance (Eesn) from the Satel-light database. 
>> 
>> Can I just divide the direct horizontal irradiance by cos(altitude) to get the direct normal irradiance? Is that valid?
>> 
>> John Ford. 
>> 
>> _______________________________________________
>> Radiance-general mailing list
>> Radiance-general at radiance-online.org
>> http://www.radiance-online.org/mailman/listinfo/radiance-general
>> 
> 
> 
> -- 
> Dr.-Ing. Jan Wienold
> Project Manager
> Fraunhofer-Institut für Solare Energiesysteme
> Thermal Systems and Buildings, Lighting and Daylighting
> Heidenhofstr. 2, 79110 Freiburg, Germany
> Phone: +49(0)761 4588 5133 Fax:+49(0)761 4588 9133
> jan.wienold at ise.fraunhofer.de
> http://www.ise.fraunhofer.de
> 
> In office: 
> Mo,Tue: 8:30-18:00
> We,Thu: 8:30-16:00
> Fr:  8:30-15:30
> 
> 
> _______________________________________________
> Radiance-general mailing list
> Radiance-general at radiance-online.org
> http://www.radiance-online.org/mailman/listinfo/radiance-general