STUDY ON USING DAYLIGHT AS LIGHTING SYSTEM ACCORDING TO VARIOUS SUN ANGLES

In recent years, it has become more common for us to rely on artificial lighting during the daytime even when daylight can be obtained at places such as office buildings. Using daylight may pave the way for energy saving system of office buildings, and the development of lighting devices which actively utilize daylight is attracting attentions. However, there are few lighting devices that are able to take light based on the movement of the sun. As the sun moves throughout the day, the magnitude and direction of light entering the room change also. Due to this, it is difficult to control the amount of light entering the room. In this study, we aim to solve this problem by installing several blind reflectors on the window whereby the reflectors are able to change its angle according to the movement of the sun. By having these reflectors, the light will be directed to the room ceiling and diffused light from the ceiling will be used to create an optimal room lighting environment. This system was simulated, assessed for all seasons on sunny days in the simulator and its energy saving effect was evaluated. With the obtained result, we hope to contribute in the promotion of a greener society.