Improving Daylight Availability in Heritage Buildings: A Case Study of Below-grade Classrooms in Tehran

Refurbished heritage buildings usually lack in meeting the required standards defined for new function especially when reused as educational buildings. Therefore, they are equipped with different post-occupancy retrofit strategies to achieve an acceptable level of environmental quality and energy demand. Daylight distribution natural light is a critical issue spaces, given that low illuminance classrooms can decrease students' performance disrupt visual tasks. In this study, daylight below-grade south-facing building Tehran, Iran investigated by implementing 57 daylighting using climate-based simulations, relation metric Useful Illuminance 300-3000lux (UDI-Autonomous). The research proposes use reflectors on interior ceiling exterior side windows (on ground) highest result possible. Although, applying these two systems individually, boost spatial 75 % 71%, respectively, combination them provide users UDI-Autonomous 99% classroom space more than half occupancy time.