Análise do uso da luz natural em salas de aula : estudo de caso em Aracaju - SE

Abstract

The use of daylight brings many advantages, as a better quality lighting, psychophysiological benefits and the outside view. In addition, it minimizes the use of artificial lighting and it contributes to the recent interest in energy efficiency. But, despite the daylight s availability existing in Brazil, especially in its Northeast, and despite the great number of daylighting simulation tools, the concern with its optimization hardly takes part on the inicial design of buidings. This thesis is embedded within this context and it aims to analyze and compare the lighting performance between classrooms, trying to support daylighting in these environments. With the TropLux, the simulation of a standard classroom in the city of Aracaju, state of Sergipe, designated Geometry 1, the simulation of some changes in its characteristics, designated Geometries 2 and 3, and the simulation of new geometries with daylighting systems, designated Geometries 4 and 5, were proceeded. In both cases, the CIE Sky types 1 (overcast), 10 (partly cloudy) and 14 (clear) were considered. To analyze the lighting performance of these geometries, it was created isocurves graphics with percentages of illuminances inside the interval 300 lx < E < 2000 lx. From these isocurves graphics, different behaviours of the geometries under the Sky types analyzed were observed. To compare its performances, the average of illuminance s average, the average of the illuminance s percentages inside the interval above and the maximum and minimum values of the illuminance s average were calculated. These values evidence that isolated interventions in the standard classroom (Geometry 1), like increasing the ceiling reflectance (Geometry 2) or adopting a dropped ceiling plan (Geometry 3), does not contribute with the lighting performance s improvement in the illuminance`s interval considered. Nevertheless, they evidence na evolution in the lighting performance of Geometry 5 in relation to the standard classroom (Geometry 1).