Daylighting performance evaluation of a bottom-up motorized roller shade
- Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, QC (Canada)
- School of Civil Engineering, Purdue University, West Lafayette, IN (United States)
This paper presents an experimental and simulation study for quantifying the daylighting performance of bottom-up roller shades installed in office spaces. The bottom-up shade is a motorized roller shade that opens from top to bottom operating in the opposite direction of a conventional roller shade, so as to cover the bottom part of the window, while allowing daylight to enter from the top part of the window, reaching deeper into the room. A daylighting simulation model, validated with full-scale experiments, was developed in order to establish correlations between the shade position, outdoor illuminance and work plane illuminance for different outdoor conditions. Then, a shading control algorithm was developed for application in any location and orientation. The validated model was employed for a sensitivity analysis of the impact of shade optical properties and control on the potential energy savings due to the use of daylighting. The results showed that Daylight Autonomy for the bottom-up shade is 8-58% higher compared to a conventional roller shade, with a difference of 46% further away from the facade, where the use of electric lighting is needed most of the time. The potential reduction in energy consumption for lighting is 21-41%. (author)
- OSTI ID:
- 21396186
- Journal Information:
- Solar Energy, Vol. 84, Issue 12; Other Information: Elsevier Ltd. All rights reserved; ISSN 0038-092X
- Country of Publication:
- United States
- Language:
- English
Similar Records
Efficient modeling of optically-complex, non-coplanar exterior shading: Validation of matrix algebraic methods
Performance of Integrated Systems of Automated Roller Shade Systems and Daylight Responsive Dimming Systems