Effects of the splayed window type on daylighting and solar shading

Abstract

Solar shading is generally considered to be used in hot or similar climates; however in certain climates with high solar radiation and high diurnal temperature variation, solar shading for windows is also necessary. A typical type of shading for this climate is the splayed window. An investigation of the performance of daylighting and solar shading of this window type can benefit the solar shading design for similar climates.This paper identifies the influencing factors of the splayed window type in daylighting and solar shading and ranks their importance factors via an orthogonal experimental design. Next, the detailed effects of the dimensional factors are investigated for a window of western orientation for a case in Lhasa via a series of simulations using Radiance and Daysim. Afterwards, the performances of this window type in other locations are examined.The results reveal that the ratio of the exterior and interior window opening areas and orientation have significant influences on the integrated performance in daylighting and solar shading, and the West orientation is identified to be the best for usage of this window type. Similar performances are found in other locations and RDA/SC is found to have a strong positive correlation with the incident solar radiation and the splayed window will be more effective in locations with high incident solar radiation in terms of solar shading and daylighting.