絶対値で表す天頂輝度と天空輝度分布 : 天空輝度分布の分類法の研究(その4)

Abstract

A numerical equation has been proposed by the authors in the previous papers. It gives the relative values of the sky luminance distribution for all sky conditions. Though the numerical equations for the zenith luminance in absolute value on the various standard skies have been proposed by several researchers to get the sky luminance distribution in absolute value, they do not bring the suitable value for the new equation. A numerical equation on the zenith luminance using the same indices as those of the newly proposed equation has been composed. It has made it possible for the sky luminance distribution in absolute value to be estimated by one of the easiest measurable values, the global illuminance. The result of this research work convinced the authors of its contribution to the progress and development of the prediction technique in the daylit environment. The new equation of the zenith luminance in absolute value is introduced, the process of composing it is explained in detail and the examples of the sky luminance distribution for all sky conditions in absolute values are illustrated in this paper.