夜景亮度及建筑材料光反射特性与照明节能

Light Reflecting Characteristics of Building Materials and Energy Saving of Nightscape Luminance

为了实现城市夜景照明节能，研究了城市夜间区域亮度变化所需的能耗变化。根据功率密度值8．9w／m^2的能耗指标，计算出夜景亮度每提高1cd／m^2将多耗电能0．84W，夜间城市区域亮度提高1～2cd／m^2，在城市亮背景下人的视觉功能难以分辨其效果，但由此增加的电能耗费巨大。在照明条件相同的情况下，建筑饰面材料的光反射特性直接影响景物亮度，通过实验研究了不同建筑饰面材料的光反射特性，并在CIE推荐的漫反射材料照度计算公式的基础上，建立了建筑物照度计算模型。

In order to realize energy saving of urban nightseape luminance, power consumption was studied with the change of urban luminance. Based on energy consumption indicator（LPD） of 8.9 W/m^2, it was calculated that about 0.84W more energy consumption would be for 1cd/m^2 increase of luminance. The effect of 1 to 2cd/m^2 increase was hard to distinguish for human＇s visual function under urban nightseape, while the energy consumption was great. Under the same lighting condition, the reflecting characteristics of building surface materials could affect directly the luminance of nightscape. With the study of the reflecting characteristics of different building surface materials, an illumination calculation model for building was proposed based on the formulation of CIE.