Correlações entre o fator de luz do dia médio e as métricas dinâmicas em regiões tropicais

Abstract

Visual comfort in buildings is directly linked to design decisions, such as the sizing of openings. Simulation software helps predict the availability of natural light and assess the lighting performance of spaces, but they have drawbacks, such as high computational demand and complexity of use. For the early stages of design, where multiple geometries need to be tested, the Average Daylight Factor can be a simplified alternative. Originally developed in Europe as a static metric for use in overcast skies in temperate climates, its application in tropical regions requires evaluation. Therefore, the objective of this study was to identify the relationships between the Average Daylight Factor and dynamic metrics in tropical regions, in order to evaluate the feasibility of using the Average Daylight Factor as a tool in the preliminary design stages in these regions. Spaces with different opening proportions (1/10, 1/8, 1/6, and 1/4) and obstruction scenarios (no obstruction, with an overhang, and a frontal wall) were analyzed under different sky types (1, 10, and 14 from CIE and DLL) and latitudes (Macapá/AP, Maceió/AL, and Vitória/ES). The dynamic metrics evaluated were Annual Average Illuminance (AAI), Daylight Autonomy (DA), Spatial Daylight Autonomy (sDA), and Annual Uniformity (AU). The results show that there is no significant correlation between the Average Daylight Factor and AU in the studied situations. On the other hand, they highlight a strong correlation between the Average Daylight Factor and the metrics AAI, DA, and sDA, suggesting that it can be used as a tool in the early stages of design in tropical regions.