Tarbiat Modares University Naqshejahan- Basic studies and New Technologies of Architecture and Planning 2322-4991 14 4 2025 01 20 Comparative Investigation of Thermal Performance of Multi-Layered Canopies with Complex Geometries in Double-Skin Facades Comparative Investigation of Thermal Performance of Multi-Layered Canopies with Complex Geometries in Double-Skin Facades 125 156 1011 FA Mostafa Hosseini Vajari PhD Student, Department of Architecture, Semnan Branch, Islamic Azad University, Semnan, Iran Hossein Moradinasab Department of Architecture, Semnan Branch, Islamic Azad University, Semnan, Iran 0000-0002-5521-5848 Morteza Behzadnasab Color Department, Polymer Process Research Institute, Iran Polymer and Petrochemical Institute, Tehran, Iran Mahmoud Nikkhah Shahmirzadi Department of Civil Engineering, Semnan Branch, Islamic Azad University, Semnan, Iran Majid Soltani Assistant Professor, Faculty of Mechanical Engineering, Khajeh Nasir Toosi University of Technology, Tehran, Iran Journal Article 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. 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.

https://bsnt.modares.ac.ir/article_1011_7f975a56c761db6506eca0b37ce6ec87.pdf