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Irregular light scattering properties of fenestration for comfortable and energy-efficient buildings

Publication Type:

Journal Article


International Journal of Digital Innovation in the Built Environment, Volume 10, Issue 2, p.1-16 (2021)


BSDF, complex fenestration, daylight redirection, daylight simulation, glare control, gonio-photometry, solar shading, visual comfort


The irregular reflection and transmission properties of innovative fenestration allow to redirect selectively admit or block solar irradiation based on its incident direction. Compared to systems that implement adaptivity by mechanical transformations, such tailored light scattering reduces the complexity of installation, operation and maintenance as well as the impact on outward view and the aesthetical appearance of buildings. Examples of such fenestration techniques, e.g. light redirecting films and Venetian blinds featuring irregular reflection properties, are presented with their gonio-photometrically measured scattering properties. Techniques to model optically complex fenestration to support product development and planning are presented. Effects on daylight availability, glare and solar gains are demonstrated. Preliminary results indicate the potential to control and modulate rather than to block irradiation the design of buildings aiming at high comfort and energy efficiency.