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The Influence of Window Placement on Cross-Ventilation Efficiency in Residential Buildings

Abstract

Natural ventilation is an important passive strategy for improving indoor thermal comfort, indoor air quality, and energy efficiency in residential buildings. Cross-ventilation occurs when air enters through openings on one side of a building and exits through openings on another, creating airflow across occupied spaces. The effectiveness of this process is strongly influenced by the placement, size, orientation, and relationship of windows within the building. Poorly positioned windows may restrict airflow paths, while appropriately arranged openings can enhance air movement and improve indoor environmental conditions. This study assesses the influence of window placement on cross-ventilation efficiency in residential buildings by examining how different window configurations affect indoor airflow. The assessment considers factors such as window position, height, size, orientation, spacing, and alignment between inlet and outlet openings. The relationship between window placement and the internal arrangement of rooms is also examined to determine how spatial configuration influences the movement of air through residential spaces. Particular attention is given to the alignment of windows with prevailing wind directions. Windows positioned to receive incoming winds can provide effective air entry, while appropriately located outlet openings can facilitate the removal of warm and stagnant air. The study therefore considers building orientation, prevailing wind direction, window-to-wall ratio, and the distance between opposing openings. Differences between directly aligned and offset window configurations are also considered in relation to airflow distribution. Internal architectural elements can significantly influence the effectiveness of cross-ventilation. Walls, partitions, doors, furniture arrangements, corridors, and other spatial barriers may obstruct or redirect airflow after it enters a building. The study examines how these elements interact with window placement to determine whether air can reach deeper areas of residential spaces. The influence of room proportions, ceiling height, and connections between adjoining spaces is also considered as part of the overall ventilation assessment. Effective cross-ventilation can help remove accumulated heat, moisture, odours, and indoor pollutants while improving occupants' perception of thermal comfort. However, excessive or poorly controlled airflow may also create uncomfortable drafts or introduce outdoor pollutants and dust. Security concerns, privacy requirements, noise, and weather conditions can further influence occupants' willingness to keep windows open. These considerations highlight the need for window placement strategies that balance ventilation performance with other residential design requirements. The study aims to determine the relationship between window placement and cross-ventilation efficiency and identify architectural configurations that can improve natural airflow in residential buildings. The findings are expected to support decisions concerning window positioning, building orientation, room arrangement, and ventilation openings during the design process. The research can contribute to residential buildings that achieve improved natural ventilation, enhanced thermal comfort and indoor air quality, reduced dependence on mechanical cooling, and greater environmental responsiveness.

Keywords: Window placement, Cross-ventilation, Residential buildings, Natural ventilation, Airflow efficiency, Window configuration, Building orientation, Prevailing winds, Ventilation openings, Room arrangement, Thermal comfort, Indoor air quality, Passive cooling, Climate-responsive design.