Multi-Objective Optimization of Daylighting for an Office Space in a Very Hot Climate: A Comparison of Corrugated, Perforated, and Separated Shadings

Dynamic shading systems offer a promising approach to improving daylight and visual comfort in hot climates. The present work aims to enhance hourly daylighting performance by optimizing useful daylight illuminance (UDI500~1000 lx), illuminance uniformity (Uo), and daylight glare probability (DGP). Radiance and SPEA-2 enable the identification of optimal solutions for corrugated, perforated, and separated trapezoid shading systems. The first multi-objective optimization selected a 15° slat angle, yielding an average illuminance of approximately 782.22 lx, a Uo of 0.7229, 100% coverage in the UDI500~1000 lx range, and a DGP of 0.3324. Fully automatic control of the upper, central, and lower facade sections addressed issues of UDI300~500 lx in June and UDI1000~2000 lx in December. Corrugated shadings achieved over 90% for UDI500~1000 lx during most investigated equinox and solstice conditions, with a minimum Uo of 0.79 in March and approximately 0.6 in December. Perforated inclined panels improved UDI500~1000 lx for morning and afternoon. The fully automated trapezoid-separated shading system increased UDI500~1000 lx coverage to at least 99.47% at 15:00 in March, 92.95% at 15:00 in June, and 92.06% at 12:00 in December, with DGP within imperceptible glare. The methodological scope was limited to a selected office space and point-in-time simulations from 10:00 to 15:00 on representative equinox and solstice days; therefore, the results should be interpreted as simulation-based design guidance rather than full annual or experimentally validated performance.