The study of effective factors in daylight performance of light-wells with dynamic daylight metrics in residential buildings

The main goal of this research is to estimate the effect of some affecting variables on the daylighting performance of light-wells (the area and horizontal section form, the optimal height of the light-well, orientation variation and the slope of light-well surrounding wall) to provide suggestions for better utilization of light-wells in residential building. 352 computer simulations using Daysim software have been conducted to assess the expressed variables. Also, Autodesk Ecotect software has been used as graphical user interfaces for Daysim. The findings of this study show the better daylighting performance of cylindrical light-wells compared with the common square light-well in Tehran. Also, the optimal height of different types of light-wells in residential buildings has been suggested with regards to the adequate daylight autonomy (DA) in connected rooms to light-well. The results of this study show that the increasing of the suggested optimal height for different types of light-wells is possible with increasing the slop of walls of light-wells and the window size in the lower floors.