ANÁLISE ANUAL DA EXPOSIÇÃO À INCIDÊNCIA SOLAR DIRETA, AO OFUSCAMENTO E AOS NÍVEIS DE ILUMINAÇÃO NATURAL EM AMBIENTE COM PROTEÇÕES SOLARES INTERNAS

Abstract

This article aimed to analyze annual occurrences of direct sunlight, daylight glare probability and daylighting, in a side-lit room under situations without solar control and controlled by internal shading devices. The research was based on the climate-based building modeling and simulation approach. Based on environmental conditions from Florianópolis-SC, a building model was submitted to daylighting simulation in four orientations and hourly values of glare indicators, direct sunlight and daylighting were recorded, considering 10h daily occupancy. At uncontrolled condition, analysis was performed for occupant sitting in three positions along the depth and with three view directions. From the cases with the most critical daylight glare probability, roller shades, blinds 0° and blinds 50° were operated by four controls. Each device was configured in two sets of optical properties. Hourly results were transformed into annual frequencies and spatial-temporal criteria. It was possible to identify a satisfactory reduction in daylight glare probability with view direction change, but distancing 2.0 m from the window reached an ineffective reduction. In the most critical position (1.5 m of the window), the ‘always 100% closed’ mode and glare control mode indicated effective reductions of annual daylight glare probability frequencies, direct sunlight and excessive illumination, by using clear roller shades and clear blinds 50 ° clear. In addition, these cases contributed to daylighting use, as opposed to dark devices