INTEGRATED LIGHTING AND SHADING CONTROL USING DAYLIGHT MODELLING OF AN OFFICE ROOM

An integrated control of both artificial lighting and Venetian blinds is one method of decreasing energy consumption in office buildings. However, developing a practical and viable control system is not straightforward. Choosing the right illuminance level for the whole room and, at the same time, preventing the occupants from glare and direct sun is a demanding task. Besides technical problems, the Northern climate also sets limits to daylight control. Low solar altitudes and dynamic daylight situations are difficult to combine with the control algorithm. The paper presents one approach in which daylight measurements and computer simulations were utilized in modelling and control of the lighting system. The approach was demonstrated by combining the model with the DALI (Digital Addressable Lighting Interface) lighting control installed in a test room.