Clearness index

Hi SAM team, 

Having downloaded weather file,  

 From the weather file, how to
1. identify or calculate clearness index.
2. Identify energy incident on a horizontal flat plate with atmospheric effects and
3. Identify energy incident on a horizontal flat plate without atmospheric effects

Kind Regards,

Hello,

This lesson from the Penn State EME 810 course discusses clearness index in the context of photovoltaic system design:

www.e-education.psu.edu/eme810/node/684

The course is described on the SAM website Training and Curricular page:

sam.nrel.gov/training-curricula.html

Best regards,
Paul.

Thank you Paul, I'll read up on it