Abstract
The amount of reflected daylight and its distribution within a room varies according to different types of shading devices. In the case of brises, the number of slats, the specularity and the reflectance of the surfaces can influence the performance of daylighting and the use of sunlight. The aim of this study is to investigate the performance of shading devices in classrooms, taking into account reflected sunlight efficiency (proposed index), which relates the reflected sunlight component to global illuminance. The study chose three variables related to these devices: number of pieces, specularity and reflectance. The resulting models were analysed for the efficiency of reflected sunlight, in Maceió. The program used for the computational simulations was TropLux. Statistical analyses were performed in order to identify the variables with greatest impact on reflected sunlight efficiency. The results showed that the reflectance of the devices is the variable that most positively influences reflected sunlight efficiency, increasing the index by up to 142%. The conclusion is that it is possible to increase the use of sunlight through the variation of certain characteristics of shading devices, bringing benefits to the daylighting of indoor environments.
Keywords:
Daylighting; Reflected sunlight; Shading devices
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