Fundamental Study on the Effect of Daylighting on Visual Comfort

有必要揭示从窗户获得的日光如何影响建筑物居住者的眩光和亮度感觉；这对于开发采光系统至关重要，它可以减少照明的电力消耗，从而提供足够的视觉舒适。本研究涉及眩光感觉、亮度感觉、照度等物理量与不满意百分比之间的关系。我们在研究中采用的方法是实验方法，使用一个为照明研究而建造的房间和许多受试者。从实验数据出发，推导出了预测眩光感觉的经验公式。结果表明，眩光感觉与亮度的对数成正比，与眩光光源立体角的对数成反比。并利用推导出的公式对典型办公空间的眩光分布进行了数值模拟。结果表明，卷帘比卷帘更能有效地遮挡强烈的日光，提供较少眩光的照明环境。

It is necessary to reveal how daylight available from windows affect glare and brightness sensations of building occupants ; this is essential in developing daylighting systems, which can reduce the electricity consumption for lighting giving enough vidual comfort.The present study dealt with the relationship between the glare sensation, brightness sensation, various physical quantities such as illuminance, and the percentage of dissatisfied. A method we took in the study is the experimental one using a chamber constructed for lighting study and many subjects.We derived an empirical glare formula to predict glare sensation from experimental data. It was found that the glare sensation is proportional to the logarithm of the luminance and inversely proportional to the logarithm of the solid angle of the glare source. We also performed numerical simulation using the derived formula to predict the glare distribution in a typical office space. The results showed that venetian blinds are more effective than roll screen to shade the intense daylight and to provide a luminons environment with less glare.