A Research on Basic Data for the Design of Combined Light Shelves Depending on Internal Angle

Abstract

2.2 Abstract. One of the natural lighting systems, Light Shelf, has advantages of higher constructability and economic feasibility compared to other passive natural lighting systems. Active light shelves can control the amount of indoor light according to the preference of the occupants. Light shelves can also control glare from direct sunlight as a shade against the strong light levels on the window side. This research aims to identify the relevance of the impacts of changing angles of combined light shelves on natural lighting in residential spaces, and to draw the values of efficient lighting performance of light shelves using a real-scale test bed. The research was conducted in the following order: 1) To analyze the definition, application cases and problems of light shelves and find out experimental elements and variable factors of light shelves by contemplating the advanced researches; 2) to apply the meridian transit altitude in each solar term and the light levels based on the advanced researches, and conduct experiments by setting the height, angle, size and external variable factors of light shelves; and 3) to conduct the performance evaluation to verify the validity of light shelves. Performance evaluation is conducted in each solar term depending on the solar altitude of combined light shelves, and verifies the relevance and utility of variable factors by analyzing the indoor lighting levels based on the daylight inflow according to the angles of combined light shelves.