SOMBREAMENTO COM ILUMINAÇÃO

DESENVOLVIMENTO DE MODELO PARAMÉTRICO PARA FACILITAR ESCOLHAS DE PROJETO ENVOLVENDO CRITÉRIOS CONFLITANTES

Abstract

This paper aims to develop and test a parametric model to support the early design of shading devices with the optimization of conflicting criteria: blocking solar radiation and providing the incidence of daylight. The geometric model consists of a room with one window and also the possibility of an external obstacle. There are four types of shading devices that can be selected and adjusted by the user: horizontal and vertical louvers, lightshelf and a mixed louver (with both horizontal and vertical blades). After the setup of the simulations, five numeric values were defined to be used as goals within a multicriteria evaluation tool with genetic algorithms. In this study, three objectives were chosen: maximize the number of points between 300 and 750 lux, increase average illuminance levels and reduce the incidence of direct solar radiation on the window surface. In order to exemplify the evolutionary process, six cases were selected in two distinct areas of the 3d graph among the most fit solutions (Pareto front). In the 20th generation, only two of those cases were still among the best solutions. The other solutions were replaced by better ones. The results plotted in a 3d graph allow us to associate the area in which each case is located with the type of solution that was generated. That happens because of the impossibility of having the best performance in all three performance goals. Therefore, the final selection depends on the importance of each criterion has to the designer.