An Algorithm for Designing Dynamic Solar Shading System

The present study aims to define and validate an analytical procedure for determining the optimal movement profile for dynamic shading system based on the horizontal mobile blinds for high level of illumination and visual comfort in indoor environments. The algorithm is developed to design a dynamic solar shading system for an office building (Ergo Tower) situated in Milan, Italy. The calculations take into account variables such as geographic location, date, time, surface orientations and geometrical and functional characteristics of shading system. In the first step the solar coordinates and the variation of solar incidence angle on the building surfaces have been defined. Using the equations of solar geometry the typical solar path (sun position e.g. solar altitude, azimuth etc.) corresponding to the specific location for the entire year and also the variation of the incidence angle with which the direct radiation affect the building surfaces are described. Based on the geometry of shading system, the optimal values of inclination of the profiles can be calculated. Finally, due to the technical limitations of the systems, the feasible configuration has been determined corresponding to an angle close to the optimal values of inclination for ensuring appropriate shading. This test system allows the definition of the movement of dynamic solar shading systems based on a specific location and geometrical/mechanical characteristics of a certain technical solution.