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This paper investigates the annual daylight performance of a small private office and in a large open plane office equipped with automated shades. Annual daylight autonomy and useful daylight illuminance are computed as a function of the following facade design parameters: window-roller shades prevents direct sunlight to enter the space independently for each orientation in order to avoid glare. Overall values for daylight performance are obtained by averaging the values of all evaluated points in space or by requiring all points to meet the illuminance requirement at the same time. The results show that for private offices, north and east facing facades allow higher daylight provision due to shading operation during working hours. However, illuminance between 500-1000 lux (46.5-92.9 fc) - an important index - reach a maximum for 30-40% window-to-wall ratio in almost all studied cases. For open-plan offices, daylight autonomy varies with climate and shading properties. Experiments were performed in a full-scale test office space to validate the simulation results - the comparison between measured illuminance and simulated values showed good agreement.

Citation: ASHRAE Trans., vol. 118, pt. 2, San Antonio, TX