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The Influence of Window Design on Natural Ventilation and Daylighting

Abstract

Windows are important components of building design because they influence the movement of air, the admission of natural light, and the connection between indoor and outdoor environments. In warm and tropical climates, well-designed windows can support passive cooling and reduce dependence on mechanical ventilation and artificial lighting. However, inappropriate window design may result in inadequate airflow, excessive solar heat gain, glare, or insufficient daylight. Understanding the relationship between window characteristics, natural ventilation, and daylighting is therefore essential for developing comfortable and energy-efficient buildings. This study examines the influence of window design on natural ventilation and daylighting, with emphasis on how different window characteristics affect indoor environmental performance. The research considers window size, shape, orientation, opening type, position, height, glazing characteristics, and window-to-wall ratio. It also investigates how these factors influence the amount of daylight entering interior spaces and the movement of air through openings. The study provides a basis for evaluating window design as an integrated passive design strategy. The research assesses the relationship between window configuration and natural airflow within buildings. Operable windows can facilitate cross-ventilation when positioned appropriately on opposing or adjacent façades, while their height and opening area can influence the volume and direction of incoming air. Window placement can also affect pressure differences created by external wind conditions and temperature variations. The effectiveness of these strategies depends on building orientation, surrounding structures, wind patterns, room configuration, and the location of internal partitions. The study also evaluates the contribution of window design to daylight performance. Window size, glazing type, sill height, head height, and spatial depth influence the distribution and penetration of natural light within interior spaces. Larger windows may increase daylight availability but can also increase solar heat gain and glare if not appropriately shaded. The integration of shading devices, light shelves, glazing treatments, and appropriate window orientation can therefore help balance daylight access with thermal comfort and energy performance. The findings are expected to provide useful information for architects and building designers seeking to improve indoor environmental quality through appropriate window design. Effective window configurations can enhance natural ventilation, improve daylight availability, reduce artificial lighting requirements, and support thermal comfort. The study may also identify design considerations for balancing airflow and daylighting with potential challenges such as excessive heat gain, glare, noise, privacy, and security. Ultimately, the study aims to establish a clearer understanding of how window design can simultaneously support natural ventilation and daylighting. By examining window geometry, orientation, opening characteristics, glazing, and shading, the research contributes to climate-responsive and energy-efficient building design. The findings can support evidence-based decisions regarding window placement and configuration while encouraging architects to treat ventilation and daylighting as interconnected components of passive environmental design.

Keywords: Window design, Natural ventilation, Daylighting, Building performance, Thermal comfort, Indoor environmental quality, Window-to-wall ratio, Window orientation, Cross-ventilation, Natural lighting, Glazing, Solar heat gain, Passive design, Energy efficiency.