OPTIMISASI PARAMETRIK FASAD BILAH HORIZONTAL TERHADAP PENCAHAYAAN ALAMI DENGAN METRIK USEFUL DAYLIGHT ILLUMINANCE (UDI) DI KOTA LHOKSEUMAWE

Abstract

This study examined the effects of optimizing rotation (α) and width (l) of the horizontal blades for optimal daylighting in Lhokseumawe. A hypothetical elementary classroom, without any context, was computationally designed and examined using UDI metric. Optimization Genetic Algorithm (GA) method with Galapagos were used to obtain the rotation solution and optimal daylighting. Moreover, Radiance and Daysim simulation engines connected to parametric platform of Rhinoceros and Grasshopper using Ladybug Tools as mediating tools were administered for the analysis. The optimization was aimed at maximum UDIo.avg (100-2000 Lux). Result revealed rotation and width of the horizontal blades contributed differently to every orientation in Lhokseumawe. Two orientations were succeeded to be rationalized based on GA opmization results, first, North showed α=90 and some blades’ width of l=0,20m, l=0,22m, l=0,43 and l=0,45m resulted in UDIo.avg=100%. Second, East orientation for the combination of α=-80, l=0,30m resulted in UDIo.avg=99,29%. Further, South and West to maintained solutions from the GA optimization results as presented in this paper. In addition, North and South sides suggested a small differentiation for its rotation from full horizontal blades, which was 90 degrees. Various optimum design solutions, for rotation and width of the blades, from the GA benefitted to create non-uniform façade design for different or even at the similar orientation.