earticle

영어

The light shelf, which is a natural light system, has been intensively studied as its efficiency is recognized. However, previous studies on the light shelf have not considered various depths of space, and the performance of light shelf design has not been sufficiently studied with respect to the separation distance between a skylight and a reflection board. Therefore, the purpose of the present study is to establish the fundamental data for light shelf design by deriving an appropriate separation distance between a skylight and a reflection board, considering various depths of space. In the present study, a simulation software program, Radiance, was employed, and the performance evaluation was limited to the environment on the summer solstice when the energy consumption in buildings is the highest. The depth of space was established from 3 m to 8 m at intervals of 1 m for the performance evaluation. The separation distance between a light shelf and a skylight was set to be 50 mm, 100 mm, 150 mm, 200 mm, and 250 mm. The performance evaluation was conducted by deriving the depth of space and uniformity that satisfied the standard of 400 lx. The following conclusions were drawn from the present study. 1) The depths of space that satisfied the standard of 400 lx depending on the separation distance between the light shelf and the skylight established in the present study were the same at the light shelf angle of 0̊. However, the performance of the light shelf depending on the separation distance between the light shelf and the skylight was dependent on the depths of space at the light shelf angle of 30̊. 2) With regard to the uniformity depending on the separation distance between a light shelf and a skylight, the uniformity was excellent in the case where the separation distance between a light shelf and a skylight was equal to or shorter than 100 mm, while the uniformity was poor in the case where the separation distance was equal to or longer than 150 mm, which should be considered in the design of a light shelf. In the present study, appropriate factors related to light shelf design were identified by analyzing the performance of a light shelf depending on the separation distance between a light shelf and a skylight. Various studies may need to be conducted in the future about the performance variation on the basis of the separation distance between a light shelf and a skylight depending on the depth of space in controlling the angle of a light shelf.