Study of Facades with Diffuse Asymmetrical Reflectance to Reduce Light Pollution

The paper continues the study of asymmetrical reflection for facades finishing materials in order to reduce light pollution. Instead to study prismatic profiles, the paper is studying cylindrical profiles, with increased possibilities of optimization. They generate diffuse asymmetrical reflections using perfect diffuse paintings (ie symmetric). Optimization of facades lighting pollution is analyzed in the context of other performance criteria such as energy savings in heating and cooling, indoor visual comfort. The study of asymmetrical reflections was realized using three types of profiles with different heights. Original MATLAB functions are used, developed by author and visualization and interpretation of the results was facilitated by internal MATLAB functions. To validate theoretical results, measurements were performed on a sample test, small (40 cm x 40 cm) but with profile at natural scale. Measurements had confirmed initial assumptions; using diffuse reflection, the micro profiles with asymmetrical reflection could significantly reduce the light pollution.