Precise studies have been made systematically, both in theoretical and experimental approaches, to decide the suitable calculating system of the illuminance in the room with the louvered ceiling, having sufficient accuracy for the practical lighting design.
This report (Part 2) refers to the total procedure of the calculating method based on the Zonal Cavity Method as the theoretical background. The factors in respective steps in the method, the utilization factor in the ceiling cavity, the efficiency and the luminous intensity distribution of the louvers, and the utilization factor of the louvered ceiling are also refered to.
In order to validate the total and respective steps of the method, the experimental rooms with the louvered ceiling were made, and the values in respective steps were measured and compared with the calculated values.
Especially, in this study, as the light source above the louver, discrete fluorecent lamp luminaires were adopted instead of the continuous light source to simulate actual louvered ceiling systems.
As a result, it was ensured that this calculating method has sufficient accuracy for normal condition of the louveres and that this is applicable for practical purpose even to the louvered ceilings which have discrete light sources.
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