This paper reviews the differences between thermal and daylighting considerations for building design and their implications for using illuminance and irradiance data. Old and new mathematical models for luminance distribution and illuminance calculation are explained. Overcast, clear, and average sky conditions are discussed and their dependence on atmospheric factors is examined. We focus in particular on the turbidity of the clear atmosphere and the luminance at the zenith. We conclude that more measured daylighting data are required for validating the equations that have been developed separately in various parts of the world.
BT - 5th Conference on Atmospheric Radiation C1 -Windows and Daylighting Group
C2 - LBL-16425 CN - LBL-16425 CY - Baltimore, MD DA - 10/1983 LA - eng N2 -This paper reviews the differences between thermal and daylighting considerations for building design and their implications for using illuminance and irradiance data. Old and new mathematical models for luminance distribution and illuminance calculation are explained. Overcast, clear, and average sky conditions are discussed and their dependence on atmospheric factors is examined. We focus in particular on the turbidity of the clear atmosphere and the luminance at the zenith. We conclude that more measured daylighting data are required for validating the equations that have been developed separately in various parts of the world.
PP - Baltimore, MD PY - 1983 T2 - 5th Conference on Atmospheric Radiation T3 - 5th Conference on Atmospheric Radiation TI - Daylight Availability as a Function of Atmospheric Conditions ER -