Proposal of a Light Shelf System Design According to the Separation Distance between Skylight and Light Shelf Reflector

Abstract

Energy used in buildings takes up 38-39% worldwide, among which lighting accounts for 22-28%. If lighting energy consumption is reduced globally, it is possible to accelerate energy saving. Thus, this study aims to propose a light shelf system among natural lighting systems to save lighting energy. The light shelf system proposed by this study is a system that can cope with the changes of light shelves according to the weight lightening of buildings through the width of the light shelf and the separation distance between skylight and light shelf reflector. To evaluate performance for energy saving, this study conducted seasonal energy performance evaluation through a real-scale test bed in which round-the-clock and year-round implementation is possible. This can reduce the use of indoor lighting energy by effectively bringing indoor light. This light shelf system can directly cope with the formational changes of light shelves due to weight lightening, which can also be used as a foundation for design to apply to changes in various buildings.