Optimisation example 2 Blind control
Optimisation variant 2a: Blind control for optimised daylight usage
Blind systems are used in functional buildings primarily for shade and sun protection. They prevent the incidence of direct sunlight into the working area.
Blind control with Shutter Control Unit (JSB/S): An optimum incidence of external light with minimum glare results from the sun position-dependent control and the opening angle of the louvers.
16 2CDC 500 060 M0201
Through blind control it is possible to influence the incidence of external light into the room. Therefore there is a direct interdependence of lighting control and blind control. If it becomes too dark in an office because a blind is closed, for example, the lighting is switched on to compensate for the lack of brightness. As a result, electrical energy is consumed by the lighting at a time when there is actually enough daylight available. A more efficient solution is the automatic control of the angle of the louvres to take account of the position of the sun. The louvres are opened just enough to ensure that sufficient daylight enters the room and direct glare is prevented. Using special light-guiding louvres the incidence of light is improved. In conjunction with a constant lighting control, which ensures that the minimum of lighting is used to maintain the required brightness, a large share of the electrical energy can be conserved. From the studies mentioned previously in this brochure, an automatic blind control can be implemented in conjunction with a presence dependant constant light control providing potential savings up to 40 % compared to manual operation of the lighting system.