教室光环境下的照度与节能

Illuminanation and energy saving in classroom light environment

为研究教室照度与视觉功效及节能的关系,对教室人工光环境下学生瞳孔随照度(亮度)的变化进行实验测量。研究结果显示:人眼瞳孔随照度(亮度)提高而缩小,但照度达到750 1x后,随照度提高瞳孔面积变化率大大减少,即很小的视觉功效提高率却需要很大的照度才能满足,因而能源效率极低,造成能源浪费。从综合节能、视觉功效和经济性的考虑,未来教室照度标准值可提高到500～750 lx,但不宜超过750 lx。

To study the relationship among illuminanation, visual performance and energy saving in classroom, the variation values of student＇s pupil area with the different illuminanation （luminance） conditions in classroom artificial light environment were measured. The result shows that the pupil area gets smaller when the illuminance is higher. But when the illuminanation value reaches 750 lx, the variation rate of pupil area sharply decreases with the increase of illuminanation, indicating that the improvement a tiny visual performance needs a greater illuminanation, and thus causes lower energy efficiency and a waste of energy. Consideration the respects of of the energy saving, visual performance and economy, illumination standards of ordinary classrooms can be promoted to 500-750 lx in future, but not more than 750 lx.