DESEMPENHO LUMÍNICO DE PRATELEIRAS DE LUZ EM ESCRITÓRIOS

Abstract

Commercial buildings that use large glazed openings in a humid tropical climate lead to an increase in the entry of natural light into the environment, which can cause interference to users, both in terms of luminous comfort and also in productivity. The increase in daylighting, when excessive, can cause glare and impair the development of activities. Shading devices are considered a good solution in controlling excess and in the best distribution of daylighting. The objective of this research was to evaluate the lighting performance of light shelves in office environments with a case study in Vitória-ES. The methodology used the Troplux software, adopting, according to the CIE, the skies 7 (partially cloudy) and 12 (clear) in the North and South orientations. In the simulations three different cases were evaluated: a) Case A - 4 shelves; b) Case B - 3 shelves; c) Case C - 2 shelves. The quantity of shelves adopted was not shown to be a relevant factor for the variation of the percentages of illuminance in relation to the UDI intervals. However, the light shelves improve the lighting performance of the indoor environment when oriented to the North, being able to considerably reduce excessive daylighting.