API field
Circumsolar treatment
Whether the bright region of sky around the sun is treated like the beam or like the sky
What it is
Selects whether the bright region of sky around the sun is shaded and given the incidence-angle loss of the direct beam, or treated as part of the diffuse sky light.
Typical values and how to get it
Chosen on the Model tab.
Values
Like beam = separate (default): the circumsolar light is shaded and given the incidence-angle loss of the direct beam; needs the Perez transposition, and with the other transpositions the circumsolar light is always treated as diffuse · As diffuse = diffuse: the circumsolar light is treated as part of the sky diffuse
References
- Perez, Ineichen, Seals, Michalsky & Stewart 1990, Modeling daylight availability and irradiance components from direct and global irradiance, Solar Energy 44(5) 271–289
API
array.circumsolar