Abstract :
This paper describes a fast daylight model suitable for embedded daylight controllers. For a given room geometry (including position
and tilt of venetian blinds, and the sun’s position), the indoor illuminances are modeled as a linear combination of outdoor global and
diffuse irradiances. A controller can implement this model by continuously recording simultaneous measurements of illuminance, blinds’
settings and sun positions. Illuminances resulting from arbitrary blinds’ settings are then predicted from a linear fit on that data. This
model has been validated against a RADIANCE model of an office room, and a ‘‘toy” controller that uses this model has been shown capable
of keeping the horizontal workplane illuminance close to a given setpoint.
2008 Elsevier Ltd. All rights reserved.
