Sustainability through Daylight Management in Buildings via Courtyards and Atriums

Abstract

Daylight management is a critical component of sustainable architecture, offering significant potential to reduce energy demand and enhance indoor environmental quality. Courtyards and atriums, long embedded in vernacular and monumental traditions, are increasingly recognized in contemporary design as effective strategies for channeling natural light into building interiors. This paper investigates their role in sustainability through a combination of literature review, simulation analysis. Historical precedents such as Roman domus and Indian havelis illustrate the enduring environmental and social functions of courtyards, while modern office atriums demonstrate the potential of glazed enclosures to provide uniform daylight distribution. Using simulation tools including Radiance and Energy Plus, the study evaluates parameters such as courtyard proportions, atrium glazing types, and surface reflectance. Results indicate that courtyards achieve daylight factors of 2–3% with strong thermal comfort benefits, while atriums reach 4–5% and deliver superior daylight uniformity, together contributing to energy savings of up to 30% in lighting loads. Challenges such as glare, overheating, and glazing maintenance are acknowledged, but design guidelines—including optimal courtyard ratios, skylight orientation, reflective surfaces, and integration with smart daylight sensors—offer practical solutions. Aligning with global sustainability frameworks, the findings demonstrate that courtyards and atriums are not merely aesthetic features but essential components of sustainable building design. By reducing reliance on artificial lighting, improving occupant well‑being, and supporting innovations such as photovoltaic skylights and dynamic façades, daylight management through courtyards and atriums emerges as a vital pathway toward holistic sustainability.