Implementation of a Dynamic Thermal and Illuminance Control System in Responsive Facades: Shading Study

Abstract

This study evaluates three shading configurations designed and tested in a preliminary stage of responsive shading device development. The strategy is based on trigonometric relationships focused on solar angles at any given moment. The configurations are thus related to the ratio of the window area shaded by a responsive brise-soleil that provides 0%, 50%, or 100% shading of the indoor space, based on the daylight needs and the indoor thermal control realized. Shading simulations were performed for Pomona, California (latitude 34.04°) for different seasons of the year. Simplified thermal simulations were run in EnergyPlus to estimate the effectiveness of the method in a full-scale environment of three shading modes (static shading device, seasonal shading, and responsive brise soleil). Comparisons were made relative to a ‘no shading’ condition to improve indoor comfort conditions. The results of the visual analysis demonstrated a higher shading efficiency for lower solar angles between the equinoxes and winter. In terms of comfort, the response brise soleil was found to be promising in locations with seasonal variations. The response was low in predominantly tropical climates. Therefore, the strategy can be used to better control indoor conditions. The extent of solar heat gain and the degree of work-task illuminance can be improved to improve comfort in naturally conditioned spaces. The extent of energy consumption can be reduced.