| Title |
A Preliminary Study on Lighting Performance and Energy Savings of a PV-Attached Light Shelf |
| Authors |
Jeong Min Kim ; Heang Woo Lee ; Jang Hoo Seo ; Yong Seong Kim |
| DOI |
http://dx.doi.org/10.6110/KJACR.2018.30.8.376 |
| Keywords |
태양광발전 ; 광선반 ; 채광성능 ; 에너지저감 ; 성능평가 PV ; Light-shelf ; Lighting performance ; Energy Saving ; Performance evaluation |
| Abstract |
Because of the recent increase in energy consumption in the building sector, more studies are being conducted to address this issue. As a part of this research, some studies have focused on solving the building-energy problem by combining the PV and light shelf, whereas previous studies examined the role of the PV by attaching it to the front of the reflector. Therefore, the purpose of this study is to derive the optimal specifications for the light shelf with PV by carrying out a performance evaluation of the lighting energy reduction and concentration according to the PV attachment area of the light shelf. This study established a full-scale test bed and an artificial light environment in order to prove the effectiveness of building-energy reduction by deriving the lighting-energy consumption and concentration energy according to the PV attachment area and light-shelf angle. The conclusions are as follows. (1) The optimal light-shelf angle to reduce the lighting energy for the conventional light shelf without PV was 30° for summer and -10° for winter. (2) The optimal light-shelf angle to increase the concentration efficiency of the light shelf with PV was -10° for summer and -60° for winter. (3) The light-shelf variables to reduce its lighting energy with PV and to increase the concentration efficiency of the PV were derived. Given the optimal variables thus derived, the light shelf with PV reduced building energy between 23.7 and 58.1 percent more than did the light shelf without PV, which proves its effectiveness. |