Fundamental Study on the Effect of Daylighting on Visual Comfort

为了减少照明用电量，提供足够的视觉舒适度，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是至关重要的。本研究探讨了眩光感觉、亮度感觉、各种物理量（如照度）和不满意百分比之间的关系。本研究采用的方法是实验研究法，利用一个照明研究室和多名被试，从实验数据中推导出一个眩光感觉的经验公式。结果发现，眩光感觉与亮度的对数成正比，与眩光源的立体角的对数成反比。我们还进行了数值模拟，使用推导出的公式来预测眩光分布在一个典型的办公空间。结果表明，百叶帘比卷帘更有效地遮挡强烈的日光，并提供一个少眩光的照明环境。

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.