عنوان مقاله [English]
The present study aims to achieve daylighting (or natural lighting) and optimal energy consumption in residential buildings. This study selected District 4 of Isfahan as the case study of a city in a hot and dry climate. A mixed method was used to examine the effect of window dimensions: simulation of light and energy, by using Diva, Honeybee, and Ladybug plugins in addition to the Energy Plus simulation engine. In this case, the window percentage to the area of the southern wall was considered as the variable to measure the optimum window percentage in terms of using daylight and energy efficiency, and then the role of window shape and size in daylighting was examined. The purpose of this assessment is to provide guidelines for architects to determine suitable sizes and dimensions of windows in residential complexes located in hot and dry climates. The results of this study show that increased dimensions and size of the window do not expand daylight utilization percentage to the same extent. Although the increased size of the window reduces electrical lighting use, an excessive increase in the size of the window does not have a considerable impact on increasing electrical lighting savings. Moreover, the exposed cooling load by electrical lighting prevents very small windows from reducing cooling energy use in the building. On the other hand, heat loss through windows prevents very large windows to reduce heating energy use. According to the results of the study, around 30% of the most optimum window dimensions occurred in the southern front o the building. Although the obtained dimensions depend on some design conditions of the building, such as the plan, surrounding buildings, and other factors, these sizes and dimensions must be determined for each building separately.