Optimization of Fin Shading Design on the Regional Secretariat Building of the Central Java DPRD in terms of Visual Comfort Aspect

This study aims to evaluate the effectiveness of fin-type shading devices in improving visual comfort in tropical office buildings and to determine the optimal shading dimensions based on daylight illuminance and glare control. The analysis was conducted through a quantitative evaluative approach using field measurements and daylight simulations in DIALux Evo. Three typical room sizes from the Setwilda DPRD Jawa Tengah office building were simulated under different shading configurations, referencing the SNI standard (300–3000 lux) for daylight and using a contrast ratio method and Daylight Glare Probability simplified (DGPs) approach for glare assessment. Results showed that medium-length shading (around 1.68 m) offered the best balance for small rooms, while moderate combinations with ceiling modifications (1.42 m) were most effective in medium rooms. In contrast, large rooms benefited most from no shading at all due to their greater daylight needs, as long as glare remained within tolerable limits. The study concludes that shading design should consider room size and orientation, with excessive shading reducing daylight quality. The findings provide practical guidance for future designs, particularly in adapting similar shading strategies in nearby buildings such as the BPKAD office.