Daylighting performance improvement of a light-shelf using diffused reflection

作者：Lee Heangwoo; Jeon Gangmin; Seo Janghoo; Kim Yongseong^*

来源：Indoor and Built Environment, 2017, 26(5): 717-726.

DOI：10.1177/1420326X16631144

• Light-shelf
• Diffused reflection
• Crystal face
• Lighting performance
• Energy saving

A light-shelf is a highly efficient daylighting system about which a great deal of research has been performed. However, improvements to the daylighting performance of light-shelves have been limited, because light-shelves could introduce external natural light into the interior space through specular reflection, rather than into a specific region of the interior environment. In this study, to improve the performance of a light-shelf, a light-shelf using the principle of diffused reflection was proposed, and its validity was verified through performance verification. The conclusions of this study are as follows: (1) The optimal angles of a flat type light-shelf and a light-shelf using diffused reflection could vary depending on measurements taken in different seasons. (2) With the installation of the light-shelf using diffused reflection in the summer, the uniformity ratio of illuminance could be improved by 29.9%-34.3% with the external type and by 10.4%-13.7% with the internal type compared to the existing flat type light-shelf. (3) For the light-shelf using diffused reflection, the lighting energy could be reduced by 7.98%-13.3% in the case of the external type and by 1.8%-4.4% in the case of the internal type compared to the existing flat type light-shelf.

• 出版日期2017-6