Keywords
Direct sunlight
Computational simulation
Visual discomfort
How to Cite
Abstract
Occupants at side-lit rooms used daily, when exposed to undesired solar radiation and excessive brightness and contrast, experience thermal or visual discomfort and consequently react by changing the occupation and window’s characteristics. In this context, this research aimed to identify and relate daylight glare probability and incident solar radiation to an occupant in a prolonged stay room. From the modeling and computational simulation of solar irradiation, hourly glare and sunshine indicators were transformed into frequencies and annual profiles. Among the annual glare probability’s frequencies, differences up to 74%, were observed, due to the 90º change in the vision direction. Frequencies of direct solar radiation greater than 50 W/m² indicated vulnerability, at about 1/5 of time of use, to occupants 1.5 m from the opening in the North, East and West orientations. Daylight glare probability and incident solar radiation’s annual profiles allowed identifying the hours through the day and the months through the year in which solar control is needed. Linear correlations between hourly DGP (Daylight Glare Probability) and solar radiation’s values resulted in an insignificant degree level (R²) but allowed to demonstrate the influence of each component on the visual discomfort. The 60 investigated combinations of positions (03), vision directions (05) and solar orientations (04) were discriminated in relation to excessive exposure and thus added design recommendations that prevent occupants from daylight glare and direct sunlight.
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