An Analysis of Illuminance Distribution due to Skylight incident on Interior Surfaces from Skylight Window of Rectangular Parallelepiped

Abstract

In order to make good use of solar energy, it is important to analyse the illuminance distribution due to skylight under various condition, In this paper, under two sky condition, CIE standard overcast sky and uniform sky, the illuminance distribution due to skylight incident from sky through horizontal skylight Window onto interior surfaces of a solid With a shape of rectangular parallelepiped is analysed, As a result, a series of equations for Calculating direct illuminance at an arbitrary point on the interior surfaces and Iuminous flux incident directly on an arbitrary interior surface is proposed, and the ratio of luminous flux distributed on interior surfaces (the base, the wall) to total luminous flux incident inside through horizontal skylight window is graphed.