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The Influence of Building Form on Solar Exposure

Abstract

Building form plays an important role in determining the amount and distribution of solar radiation received by different surfaces of a building. The configuration, proportions, height, massing, and geometric arrangement of a building can influence its exposure to direct sunlight and consequently affect indoor thermal conditions, daylight availability, energy consumption, and outdoor environmental quality. In warm climates, inappropriate building forms may increase solar heat gain and contribute to overheating, while carefully considered forms can reduce unwanted exposure and support passive environmental control. Understanding the relationship between building geometry and solar exposure is therefore important for climate-responsive architectural design. This study assesses the influence of building form on solar exposure by examining how different geometric configurations respond to solar radiation throughout the day and across different periods of the year. The assessment considers factors such as building orientation, surface area, height-to-width ratio, compactness, roof configuration, façade arrangement, and building massing. Variations in solar exposure across different building surfaces are examined to determine how changes in form affect the intensity and duration of solar radiation received by the building envelope. Particular attention is given to the relationship between building geometry and the movement of the sun across the sky. Forms with extensive exposed façades, irregular projections, recessed spaces, or large roof areas may experience different levels of solar exposure compared with compact and appropriately oriented forms. The study examines how façade orientation, building depth, roof profile, and surface configuration influence direct solar gain. These factors are considered in relation to the need for appropriate shading and solar control strategies. The study also considers the interaction between building form and surrounding environmental conditions. The spacing and arrangement of buildings can affect mutual shading, solar access, reflected radiation, and the amount of sunlight reaching façades and outdoor spaces. Building height and massing may therefore influence not only the solar exposure of individual buildings but also the environmental performance of surrounding developments. Understanding these relationships can support better decisions regarding building arrangement and site planning. Excessive solar exposure can increase heat gain through roofs, walls, windows, and other building envelope components, potentially increasing indoor temperatures and cooling demand. Conversely, excessive reduction of solar access may limit useful daylight and create poorly illuminated interior spaces. Building form must therefore balance solar protection with the beneficial use of natural light and solar radiation. This balance is particularly relevant in tropical and warm climates, where solar control is essential for maintaining thermal comfort and reducing energy consumption. The study aims to provide a clearer understanding of how building form influences solar exposure and to identify architectural characteristics that can improve solar responsiveness. The findings are expected to support the integration of solar analysis into early-stage building design and encourage the development of forms that respond appropriately to climatic conditions. By relating building geometry to solar exposure, the research can contribute to improved thermal performance, daylighting, energy efficiency, and climate-responsive architectural design.

Keywords: Building form, Solar exposure, Solar radiation, Building geometry, Solar heat gain, Building orientation, Façade design, Roof configuration, Building massing, Solar control, Passive design, Thermal performance, Daylighting, Climate-responsive architecture.