Tarbiat Modares University Naqshejahan- Basic studies and New Technologies of Architecture and Planning 2322-4991 15 2 2025 06 22 Improving the quality of daylight in classrooms using lightshelf Improving the quality of daylight in classrooms using lightshelf 1 16 1019 10.48311/bsnt.2025.1019 FA Shadan Masoud M.Sc. Student, Faculty of Architecture, College of Fine Arts, University of Tehran, Tehran 14174-66191, Iran. 0009-0004-5943-5399 Zahra Zamani Assistant Professor of Architecture, Department of Architectural Technology, College of Fine Art, University of Tehran, Tehran, Iran 0000-0003-0880-6300 Journal Article Aims: In many classrooms, due to the lack of daylight uniformity and preventing glare, curtains are drawn and artificial light is used, which increases energy consumption and reduces students' learning. One of the effective solutions is using a lightshelf. Many studies have been conducted, but they often ignored the effect of work surface height on the optimal height of the lightshelf and did not make a difference between education levels. In this research, in addition to investigating the effect of the lightshelf on daylight quality, the proper height of the light shelf in educational levels and in 4 latitudes in Iran (40, 35, 30 and 25 ̊ N) has been investigated.Methods: The simulations were done in a classroom using Rhino and Honeybee, Ladybug plugins. In order to evaluate the accuracy of the simulations, a scale model was made and the measurement were compared to the simulation results.Findings: By combining the light shelf and horizontal louvres, an optimal system was achieved in order to increase the daylight quality. The effect of different latitudes as well as different heights of desks were investigated.Conclusion: The results showed that the use of lightshelves in all cities of Iran has increased the daylight quality, while with the increase in latitude and the work surface height, the optimal height of the lightshelf should be increased. Aims: In many classrooms, due to the lack of daylight uniformity and preventing glare, curtains are drawn and artificial light is used, which increases energy consumption and reduces students' learning. One of the effective solutions is using a lightshelf. Many studies have been conducted, but they often ignored the effect of work surface height on the optimal height of the lightshelf and did not make a difference between education levels. In this research, in addition to investigating the effect of the lightshelf on daylight quality, the proper height of the light shelf in educational levels and in 4 latitudes in Iran (40, 35, 30 and 25 ̊ N) has been investigated.Methods: The simulations were done in a classroom using Rhino and Honeybee, Ladybug plugins. In order to evaluate the accuracy of the simulations, a scale model was made and the measurement were compared to the simulation results.Findings: By combining the light shelf and horizontal louvres, an optimal system was achieved in order to increase the daylight quality. The effect of different latitudes as well as different heights of desks were investigated.Conclusion: The results showed that the use of lightshelves in all cities of Iran has increased the daylight quality, while with the increase in latitude and the work surface height, the optimal height of the lightshelf should be increased. https://bsnt.modares.ac.ir/article_1019_03e0704b5690a2dee1861dc3ad3316c9.pdf