[Radiance-general] Equations for horizontal radiation/ illuminance under overcast sky

[Greg Ward]

The integrated horizontal illuminance for a standard CIE overcast sky is 7/9 times the zenith luminance.

If you have a Perez model or something more sophisticated in mind, you may need to perform a numerical integration.

Best,
-Greg

> From: "Sotiris Papantoniou" <sotos.enveng at gmail.com>
> Date: November 12, 2013 12:21:20 PM PST
> 
> Hello Radiance Group,
>  
> I want to right a code which is estimating the illuminance (or ever better radiation) in horizontal level under overcast sky. Although I have managed to find similar equations for clear sky, I haven’t managed to find any for an overcast CIE sky.
>  
> Can you lead me to any reference that can help me on this research?
>  
> Thank you
>  
> Sotiris Papantoniou
> PhD Candidate
> Environmental Engineering Dept.
> Technical University of Crete
> 
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