Paper Conference

Proceedings of eSim 2014: 8th Conference of IBPSA-Canada


A Case Study on the Daylighting and Thermal Effects of Fixed and Motorized Light Louvers

Yuxiang Chen, Samson Yip, Andreas Athienitis

Abstract: This study investigates the effects of fixed and motorized light louvers on building daylighting and thermal performance. These two types of light louvers have significantly different daylight transmitting characteristics. An energy-efficient office building with interior fixed light louvers installed on the top section of its equator-facing windows is used as the base case. A combined daylighting and thermal model for a typical section of this building with interior fixed or motorized interior light louvers is developed using a simplified approach. The model contains three thermal zones. The distributions of longwave radiation, solar radiation, and daylight of the enclosing surfaces of the thermal zones are calculated using a radiosity method. The model is verified with measured data for the base case. Using this model, the daylighting and thermal performance for different daylighting design and operation options for different climates are assessed. Results show that this simplified approach is suitable for integrated daylighting and thermal design. Motorized light louvers can effectively optimize useful solar heat gain and daylight. Suggestions for integrated design and operation are presented.
Pages: 29 - 41