Investigating the Effect of Clerestory Window Components to Improve Daylight Illuminance in Pitched Roof Buildings in Humid Climates

Clerestory windows are one of the best ways to increase the penetration of light in Low-rise buildings. However, in rainy climates with cloudy skies, receiving daylight will be more critical. Since the physical component of buildings in this climate varies according to the type of roof slope, the shape of the interior roof, and the plan's geometry. The fundamental question is: What physical characteristics can receive the maximum light from the Clerestory window in Pitched low-rise buildings? The research aimed to investigate the potential of Clerestory to improve daylight in a Pitched-roof. In the present study, Rhino software was used to design 3D models, and the Diva plugin in Grasshopper software was used to evaluate the “daylight factor.” Data indicate that; regardless of the geometry of the plan and form of internal reflection, the most effective component is the “roof slope ratio,” which creates the most significant change in interior lighting. Moreover, the 18-degree roof slope with a ceiling ratio (4-12) is the best efficiency, and provides 3.3% (A.DF) among the various. By considering the slope of the roof component and the shape of the interior reflector, the geometry of the square plan creates more appropriate daylight in the interior space.