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The Relationship Between Building Form and Thermal Performance

Abstract

Building form is an important architectural factor that influences the thermal performance and environmental behaviour of buildings. The shape, size, height, compactness, and surface area of a building determine its exposure to solar radiation, wind, and outdoor temperature variations. Appropriate building forms can reduce unwanted heat gain, improve natural ventilation, and support thermal comfort, while poorly considered forms may increase cooling requirements and indoor temperature. This study examines the relationship between building form and thermal performance by investigating how different geometric characteristics influence heat transfer and indoor environmental conditions. Building forms with varying levels of compactness, surface-to-volume ratios, orientations, and spatial configurations can respond differently to climatic conditions. Understanding these relationships can assist architects in developing building forms that respond effectively to local environmental conditions while meeting functional and aesthetic requirements. Building compactness is particularly important because it affects the amount of external surface exposed to environmental conditions. Compact forms generally have a smaller surface area relative to their enclosed volume, which can influence heat exchange between indoor and outdoor environments. More articulated forms, on the other hand, may provide opportunities for shading, courtyards, terraces, and increased ventilation but may also have greater exposed surface areas. The appropriate balance depends on climate, building use, and site conditions. Building form also influences natural ventilation and solar exposure. Courtyards, atriums, building projections, recessed spaces, and appropriate opening arrangements can create favourable conditions for air movement and solar control. The height and orientation of a building can further influence wind exposure and shading from surrounding structures. Integrating these features into the building form can support passive cooling and reduce reliance on mechanical systems. The relationship between building form and thermal performance is also influenced by other building components, including the envelope, roof, windows, shading devices, and construction materials. A well-designed form may not achieve good thermal performance if these components are poorly selected or configured. Therefore, building form should be considered as part of an integrated climate-responsive design approach that accounts for solar radiation, wind patterns, thermal mass, insulation, vegetation, and surrounding urban conditions. This study aims to assess the relationship between building form and thermal performance and identify form-related characteristics that can contribute to improved indoor thermal conditions and energy efficiency. The findings are expected to provide useful guidance for architects, designers, and building professionals in developing climate-responsive buildings. Emphasis is placed on building compactness, surface-to-volume ratio, orientation, natural ventilation, solar exposure, and passive cooling as important considerations in achieving improved thermal performance.

Keywords: Building form, Thermal performance, Building compactness, Surface-to-volume ratio, Thermal comfort, Solar radiation, Natural ventilation, Passive cooling, Building orientation, Building envelope, Heat gain, Energy efficiency, Climate-responsive design, Architectural design.