建筑物夜景亮度计算模型及修正系数

为了解决国际照明委员会（CIE）推荐的照明计算公式不适合具有混合光反射性质的现代建筑饰面材料的问题,寻找一个能符合现代建筑饰面材料的亮度计算方法,达到建筑节能与城市夜景亮度控制目的。在光度学实验室对30种常用建筑饰面材料不同方向的亮度进行了测量,用测量获得的不同方向亮度值计算出亮度修正系数K（i,β）,还分析了光在传播过程中受大气影响衰减与反射亮度的关系。将K（i,β）值与视看距离、光源种类、灯具利用、材料清洁程度、照明系统维护等作为修正系数补充CIE计算公式,建立一个新的计算模型。通过计算比对,新模型计算的照度值仅为传统公式计算的1/3。

Luminance Calculation Model and Modified Coefficient of Building Nightscape

The illumination computational formula recommended by the International Commission on Illumination（CIE） does not adapt to the modern construction materials with mixed reflection characters.In order to find a new luminance computational method adapting to the modern construction materials and to save building energy and control urban nightscape luminance,30 frequently-used construction materials with respect to various directions in photometric laboratory were measured.Then the luminance modified coefficient K（i,β） was figured out,and analysed the connection of reflection luminance and atmospheric attenuation in the process of divergence of light.The K（i,β） and viewing distance,light kinds,luminaire use,material cleanliness,maintenance condition of lighting system as modified coefficient was adopted to amend the computational formula of CIE,and then a new calculation model is derived.Through calculating and comparing,the luminance value of the new calculation model is one-third as much as that of the traditional one.