Optimizing Daylight Integration through Light Pipes in Dhaka's Office Buildings: A Simulation and Field Study Approach

The rapid urbanization of Dhaka has resulted in the proliferation of middle and high-rise office buildings, often designed with deep plans and large open layouts to maximize economic and spatial efficiency. However, these designs typically rely heavily on artificial lighting, with core areas devoid of natural daylight, contributing significantly to energy consumption—up to 50% of total building energy use. While daylight has well-documented physiological and psychological benefits, its effective integration into deep office spaces remains a challenge. This study explores the integration of light pipes with HVAC systems, forming a dual ducting system to enhance daylight utilization in office buildings. Light pipes are innovative devices that transport and distribute daylight while minimizing heat transfer, providing an effective solution for illuminating deep, windowless areas. Using EnergyPlus software for simulation analysis along with field study, the research examines the optimal design parameters for light pipe installation, including length, width, number, and positioning. Findings reveal significant potential for daylight inclusion through light pipes, improving energy efficiency and workspace quality. The study synthesizes insights from literature, field observations, and simulations to propose design guidelines for consultants. These strategies aim to optimize the luminous environment of Dhaka’s office buildings, fostering sustainable, cost-effective, and occupant-friendly working environments.