THE CRITICAL WINDOW LUMINANCE CAUSING GLARE IN INTERIORS

摘要

The simple daylighting design era ended with the introduction of various new patterns of sky luminance distributions changing with the sun path. Critical sky luminances seen by indoor work-place occupants have to be accommodated in the design and operation of such workplaces. Those building occupants who can see the sky luminance through the windows from their work positions generally see luminances reduced only due to the glazing transmittance, window shading and external obstructions.There are now 15 sky types accepted by CIE. But there is no design luminance currently recommended for any sky. In order to integrate 'discomfort glare' with daylighting design, no matter whose glare formula is used, it is necessary to know the design luminance characteristics of the light delivery systems. It is evident that the designer's task to predict and evaluate the window luminance is not easy and could be quite time consuming without the help of a user-friendly computer program.This contribution will explain and document the application of the MAM Modeller and the linear discomfort glare formula in critical glare situations.