Parametric Study on Illumination Performance of Skylights for Daylighting Enhancement

Document Type : Original Article

Authors

• Mehdi Marefat
• Amir Karimdoost-Yasuri

Tarbiat Modares University, Faculty of Mechanical Engineering

10.22067/fum-mech.v21i1.7704

Abstract

Light wells are extensively used in high-rise buildings as an integrated part of the building for daylighting. Since the solar illuminance is usually higher on horizontal surfaces than the vertical ones, roof skylights transmit more daylight than vertical windows. For proper design of daylighting, a parametric study on the effective parameters in daylighting is required. In this study, the effects of these parameters are investigated for a four-story building. Attenuation of the daylight in the floors, effects of reflectivity of the surfaces of the light well, as well as effects of the reflectivities of light well floor and room walls, effects of the dimensions of the skylight, and the slope of skylight to horizon have been studied,. The daylight factor for the three situations of the lightwell: four-sided, three-sided, and in the corner of the building have been obtained. The radiosity method or point by point algorithm has been used for daylighting calculations. Results of the present study can be used in improving the daylighting of the buildings.

Keywords

• Skylight
• Light well
• Daylight
• Illuminance

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