Roller blinds characterization assessing discomfort glare, view outside and useful daylight illuminance with the sun in the field of view

Abstract

This research presents an experiment where the relationship between view outside (VO), daylight availability (DA) and glare protection (GP) of nine shading fabrics were evaluated. This kind of shading device is placed on the market (Argentina) without a proper characterization of their lighting performance, leading to an inadequate application. Glare was evaluated through DGP model, by means of HDRI technique, calibrated through externally measured luminance and validating with vertical illuminance. Vision outside was evaluated through the View Clarity Index (VCI) and daylight availability was assessed through Useful Daylight llluminance (UDI) dynamic daylight metric. Finally, two roller blind selection procedure were proposed. The first one considering each parameter independently (GP, VO and DA) and the second criteria, weighing the scores through a ternary plot.