Investigação da probabilidade de ofuscamento considerando iluminação natural e artificial em ambientes de ensino

Abstract

Aiming at an optimized analysis of the performance levels of daylight in teaching environments, in which lighting requires special attention because it is related to the teaching-learning process, this study evaluates the occurrence of glare in the use of daylighting and artificial lighting in four environments of university education of the federal public network of Campo Grande/MS, through measurement parameters that were used in the quantitative characterization of the behavior of daylighting. The buildings have facades with glazed areas without sufficient external solar protection, which results in problems of thermal and light comfort and, to avoid discomfort, users use internal solar protection, such as blinds, which limits access to daylight and the connection with the exterior, environmental quality and occasional use of natural ventilation. The activation of the shading and artificial lighting systems were evaluated by means of photographic records regarding glare, in addition to controls to determine users and environments, under the conditions that motivated the activation (with open shading systems) and under the resulting conditions (with a fully closed shading). Measurements of illuminance and luminance were carried out, analysis of glare indexes on the students' work area, such as glare probability in natural lighting (DGP), glare index in natural lighting (DGI) and luminance ratio achieved through images HDR, and image processing in Aftab Alpha and HDR Luminance programs. The results pointed to excessive external glare as the predominant factor limiting the use of natural lighting and in view of the outside, due to light discomfort. For this reason, students have a preference for using internal shading systems, since external shading is not enough to reduce the sky glare in the students' visual field, with reflections on the monitors, glare reflected in the surroundings and glare and/or heat. due to the entry of direct natural lighting.

Keywords: glare, natural lighting, teaching environments, light comfort.