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Prediction of Daylight Areas with the Use of Students Assessment And Computer Simulation in the Tropics: Case Studies in Bandung, Indonesia

Daylighting is an efficient strategy to reduce energy consumption in buildings. To indicate daylight availability in interior spaces, a number of metrics have been proposed and applied in practice. Most standards and codes recommend the use of daylight factor due to its simplicity; however, it is insensitive with regard to façade orientations and local climates. As an alternative, the use of ‘dynamic’ or climatebased daylight metrics has been recently proposed. The validation concept of dynamic daylight metrics, has been proposed by Reinhart et al. based on a number of students assessments and computer simulations, mostly done in high lattitude regions. In this paper, the concept of predicting the daylight areas was tested in five daylit spaces in Bandung, Indonesia. 30 engineering physics students assessed each space by drawing the daylight boundary lines. Modelling and simulations were conducted in Radiance and Daysim to predict the daylight factor, daylight autonomy, and useful daylight illuminance. Results show that the daylit areas drawn by the students can be partly captured with the areas constructed with the line of 1/3 depth of the space, which is mentioned as reference line for daylight evaluation in Indonesian national standard, and the line of 1.5 times window-height. Among the dynamic daylight metrics, the daylight autonomy of 50% with target illuminance of 150 lx yields the least difference to the mean daylight areas according to the students.