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A platform for research: civil engineering, architecture and urbanism
Aerodynamic performance comparison of wind-driven turbine ventilators: A numerical investigation
https://orcid.org/0000-0001-6662-835X
Abstract Wind-driven roof ventilator is a cost-effective and environmentally sustainable solution for improving indoor ventilation and reducing energy use. This study aims to compare the ventilation performance of turbine ventilators with curved and straight blades of various sizes, utilizing both computational fluid dynamics (CFD) methods and experimental validation. Additionally, a mathematical expression is derived based on the aerodynamic principles of turbomachinery. The results indicate that both types of ventilators exhibit two streams of rotating airflow and an upward airflow. The angular velocity and ventilation rate demonstrate an approximately linear increase with higher wind speeds, and ventilators with smaller outer diameters experience a greater rate of increase in angular velocity. Larger-sized ventilators, despite having lower angular velocities, achieve higher ventilation rates for geometries of similar proportions. However, it should be noted that reducing the throat diameter may result in inadequate ventilation rates. In general, straight blade ventilators outperform curved blade ventilators, yielding 10%–38% higher ventilation rates due to their lower flow resistance. The discharge coefficients for the former and the latter are 0.32–0.37 and 0.25–0.32, respectively. The derived mathematical expression based on aerodynamics agrees well with the simulation results, providing a means for predicting ventilator performance. The objectives of this study are to enhance understanding of the ventilation performance of two types of turbine ventilators, aid in the selection and design of wind-driven roof ventilators, and promote improved indoor ventilation and energy efficiency.
Highlights The CFD method validated by experiments was adapted to analyze the characteristics of turbine ventilators. The influences of overall dimension and throat diameter were analyzed. Straight blade ventilators achieved ventilation rates 10%–38% higher than curved blade ventilators. The discharge coefficient range of ventilators was 0.25–0.37. Aerodynamic expressions were derived to understand and predict ventilation performance of ventilator.
Aerodynamic performance comparison of wind-driven turbine ventilators: A numerical investigation
https://orcid.org/0000-0001-6662-835X
Abstract Wind-driven roof ventilator is a cost-effective and environmentally sustainable solution for improving indoor ventilation and reducing energy use. This study aims to compare the ventilation performance of turbine ventilators with curved and straight blades of various sizes, utilizing both computational fluid dynamics (CFD) methods and experimental validation. Additionally, a mathematical expression is derived based on the aerodynamic principles of turbomachinery. The results indicate that both types of ventilators exhibit two streams of rotating airflow and an upward airflow. The angular velocity and ventilation rate demonstrate an approximately linear increase with higher wind speeds, and ventilators with smaller outer diameters experience a greater rate of increase in angular velocity. Larger-sized ventilators, despite having lower angular velocities, achieve higher ventilation rates for geometries of similar proportions. However, it should be noted that reducing the throat diameter may result in inadequate ventilation rates. In general, straight blade ventilators outperform curved blade ventilators, yielding 10%–38% higher ventilation rates due to their lower flow resistance. The discharge coefficients for the former and the latter are 0.32–0.37 and 0.25–0.32, respectively. The derived mathematical expression based on aerodynamics agrees well with the simulation results, providing a means for predicting ventilator performance. The objectives of this study are to enhance understanding of the ventilation performance of two types of turbine ventilators, aid in the selection and design of wind-driven roof ventilators, and promote improved indoor ventilation and energy efficiency.
Highlights The CFD method validated by experiments was adapted to analyze the characteristics of turbine ventilators. The influences of overall dimension and throat diameter were analyzed. Straight blade ventilators achieved ventilation rates 10%–38% higher than curved blade ventilators. The discharge coefficient range of ventilators was 0.25–0.37. Aerodynamic expressions were derived to understand and predict ventilation performance of ventilator.
Aerodynamic performance comparison of wind-driven turbine ventilators: A numerical investigation
https://orcid.org/0000-0001-6662-835X
Abstract Wind-driven roof ventilator is a cost-effective and environmentally sustainable solution for improving indoor ventilation and reducing energy use. This study aims to compare the ventilation performance of turbine ventilators with curved and straight blades of various sizes, utilizing both computational fluid dynamics (CFD) methods and experimental validation. Additionally, a mathematical expression is derived based on the aerodynamic principles of turbomachinery. The results indicate that both types of ventilators exhibit two streams of rotating airflow and an upward airflow. The angular velocity and ventilation rate demonstrate an approximately linear increase with higher wind speeds, and ventilators with smaller outer diameters experience a greater rate of increase in angular velocity. Larger-sized ventilators, despite having lower angular velocities, achieve higher ventilation rates for geometries of similar proportions. However, it should be noted that reducing the throat diameter may result in inadequate ventilation rates. In general, straight blade ventilators outperform curved blade ventilators, yielding 10%–38% higher ventilation rates due to their lower flow resistance. The discharge coefficients for the former and the latter are 0.32–0.37 and 0.25–0.32, respectively. The derived mathematical expression based on aerodynamics agrees well with the simulation results, providing a means for predicting ventilator performance. The objectives of this study are to enhance understanding of the ventilation performance of two types of turbine ventilators, aid in the selection and design of wind-driven roof ventilators, and promote improved indoor ventilation and energy efficiency.
Highlights The CFD method validated by experiments was adapted to analyze the characteristics of turbine ventilators. The influences of overall dimension and throat diameter were analyzed. Straight blade ventilators achieved ventilation rates 10%–38% higher than curved blade ventilators. The discharge coefficient range of ventilators was 0.25–0.37. Aerodynamic expressions were derived to understand and predict ventilation performance of ventilator.
Aerodynamic performance comparison of wind-driven turbine ventilators: A numerical investigation
Jiang, Sihang (author) / Wang, Zhichao (author) / Li, Xiaofeng (author) / Zhao, Dan (author)
Building and Environment ; 250
2024-01-05
Article (Journal)
Electronic Resource
English
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