A CALCULATION METHOD OF THE OPTICAL PROPERTIES FOR GLAZING WITH VENETIAN BLIND

Abstract

A calculation method of transmission and reflection of glazing with Venetian blind has been proposed, taking into account not only specular transmission and reflection but also diffuse transmission and reflection. The proposed detailed calculation method was compared with the conventional simplified calculation method. Both of the calculations gave almost similar results, when the blinds were installed at the indoor side of glazing. However, non-negligible difference was found when blinds were installed at the outside of glazing, especially when the surface reflectance of the slats was large. As an application of the detailed method, calculation examples of the direction distribution of transmitted and reflected lights were also shown.