[Radiance-general] Gendaylit- bad sky description (John Ford)

[Wendelin.Sprenger at ise.fraunhofer.de]

Dear John,

to my knowledge, the Perez model only works in a limited range for the sky 
clearness and brightness; at least gendaylit does. In the new version of 
gendaylit that has been announced yesterday, the sky clearness and 
brightness values are set to the border values in your case, and the 
output is still calculated. Therefore, the octree can still be created and 
used for this time step, without the bash script being aborted ("bad sky 
description"). The warning messages are still directed to stdout as long 
as the -w option is not set. 

My guess is a wrong combination of high direct-normal irradiance values 
and the defined point of time. Do you apply hourly irradiance values? Does 
the problem still exist if you change the calculation to 10-minute values? 
Maybe you can recalculate your weather files with the Skartveit-Olseth 
method (Meteonorm, for example, provides this option.) 

Cheers,
Wendelin


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