Solar radiation with a cloudy sky
Total solar radiation on a horizontal surface under a cloudy sky, Gtc
GtHc= CCF (GDH + GdH)
The CCF is the cloud cover factor detennined from
CCF = P + Q CC + R CC2
Where P. Q. R = coefficients
CC = cloud cover ( a variable between 0-10)
Posted in Fundamentals of Heating. Ventilating, and Air-Conditioning