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Mostafa Hosseini Vajari, Hossein Moradinasab, Morteza Behzadnasab, Mahmoud Nikkhah Shahmirzadi, Majid Soltani,
Volume 14, Issue 4 (1-2025)
Abstract
Aims: This study aims to investigate the impact of shading devices and airflow velocity on the thermal (energy) performance and convective flow in a south-facing double-skin façade of a building located in Semnan, a hot and arid region in Iran. The research seeks to determine which type of shading device, including inclined and multi-layer shades, can most effectively reduce indoor temperature and enhance convective flow.
Methods: Numerical simulations were conducted using SolidWorks and COMSOL Multiphysics software for geometry modeling, fluid flow simulation, and heat transfer analysis, respectively. A two-dimensional double-skin façade with various shading configurations was considered, and turbulent natural ventilation flow within them was examined.
Findings: Simulation results demonstrated that the geometry and airflow velocity significantly influenced the velocity and turbulence of the airflow within the double-skin cavity. A geometry with a multi-layer (asymmetric) shading device exhibited an 18.5% temperature reduction at the same wind speed. The maximum temperature reduction occurred in a geometry with a multi-layer (asymmetric) shading device and an airflow velocity of 5 meters per second. In other words, the best thermal performance was observed in multi-layer shading devices.
Conclusion: This research indicated that the use of multi-layer (asymmetric) shading devices can effectively reduce indoor temperature and enhance convective flow. These findings suggest that the appropriate design of shading devices can be employed as a passive method to reduce energy consumption in buildings.
