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The Effect of Building Floor Height on Natural Ventilation

Abstract

Building floor height can influence the effectiveness of natural ventilation by affecting the movement, distribution, and pressure of air within and around a building. In naturally ventilated buildings, differences in floor level can alter exposure to prevailing winds, stack effect, pressure differences, and surrounding obstructions. These factors may result in variations in air movement and ventilation performance between lower and upper floors. Understanding the relationship between floor height and natural ventilation is therefore important for developing buildings that achieve adequate indoor air movement with reduced dependence on mechanical cooling systems. This study examines the effect of building floor height on natural ventilation performance in multi-storey buildings. It focuses on variations in indoor air velocity, ventilation rates, airflow direction, and occupant thermal comfort across different floor levels. The study considers how changes in building height and floor position influence the interaction between external wind conditions and internal airflow patterns. It also examines the contribution of openings, building orientation, internal layout, and façade configuration to ventilation performance at different heights. Lower floors may experience reduced wind exposure where surrounding buildings, vegetation, walls, or other urban elements obstruct airflow. As floor height increases, buildings may experience greater exposure to prevailing winds, potentially improving wind-driven ventilation. However, increased exposure can also produce excessive air movement or uneven pressure conditions in some spaces. The stack effect may further influence vertical airflow, particularly in taller buildings where temperature differences between indoor and outdoor air generate pressure variations. The effectiveness of natural ventilation is also influenced by the size, position, and configuration of windows and other openings. Cross-ventilation may perform differently at various floor levels depending on wind direction and surrounding obstructions, while vertical openings can support buoyancy-driven airflow. Internal partitions, corridors, stairwells, atria, and other spatial elements can either facilitate or restrict air movement between spaces. These factors demonstrate that floor height should be considered alongside building configuration when evaluating natural ventilation. The study further considers climatic and urban conditions that may modify the relationship between floor height and ventilation performance. Wind speed and direction, outdoor temperature, humidity, building density, surrounding structures, and seasonal variations can influence airflow conditions. Occupant behaviour, including window-opening practices and the use of fans, may also affect actual ventilation performance. A comprehensive assessment should therefore combine environmental measurements with consideration of building characteristics and occupant responses. The study aims to assess how building floor height influences natural ventilation and identify architectural factors that can improve airflow across different levels of multi-storey buildings. It is expected to contribute to improved understanding of the interaction between building height, wind exposure, stack effect, opening design, and internal spatial configuration. The findings can provide useful guidance for architects and building designers in developing naturally ventilated multi-storey buildings that improve indoor air movement, thermal comfort, indoor environmental quality, and energy efficiency.

Keywords: Floor height, Natural ventilation, Multi-storey buildings, Air movement, Wind-driven ventilation, Stack effect, Thermal comfort, Building height, Cross ventilation, Window design, Building orientation, Indoor air quality, Passive design, Ventilation performance.