Question about CIE sky modle

[Lars_Grobe]

Hi Jing,

please check this discussion for the ssldlum.cal link to model the standard sky distribution, and Phillip’s thesis documenting it:

CIE Version 12 definition

The question remains: would you ever be able to detect any meaningful differences between, say, the Perez All-Weather (or an overcast/clear blend) and the 15 skies of the CIE GS formulation? This paper suggests not: Sky model blends for predicting internal illuminance: a comparison founded on the BRE-IDMP dataset. Journal of Building Performance Simulation, 1(3):163–173, 2008. Recall also that the daylight illumination received anywhere in a space is always some mix of direct and inter-refl…

Best, Lars,