A Numerical Study of Natural Ventilation in Building by Using Roof Solar Collector with Single-Air Channel (RSC-SC)
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Abstract
This study investigates the impact of solar radiation intensity and the geometrical parameters of a roof solar collector with a single-air channel (RSC-SC) on natural ventilation performance through numerical simulations. The mass flow rate of air was selected as the primary indicator of ventilation effectiveness. SolidWorks Flow Simulation was calibrated using the classical vertical heated plate problem, and three-dimensional airflow simulations were conducted for a model building sized 1x1x1 m, with perfectly insulated walls, floor, and ceiling. Key parameters examined include solar radiation intensity, inlet width, under-roof channel width, roof tilt angle, chimney height, and diffuser angle. The results revealed that all variables significantly enhanced the mass flow rate. For example, a 25 cm chimney increased airflow by 62% compared to no chimney; a 30-degree roof tilt improved airflow by 90% compared to a 15-degree tilt; increasing the under-roof channel width to 15 cm enhanced airflow by 47%; and a 9-degree diffuser angle increased airflow by 29%. Higher solar radiation intensity also corresponded to greater mass flow rates. The validity of the simulation results was confirmed through comparisons with both calibrated benchmark solutions and experimental data from previous studies. Consistent trends between simulations and experiments underscore the reliability of the simulation approach adopted in this research.
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ลิขสิทธ์ ของมหาวิทยาลัยเทคโนโลยีราชมงคลพระนครReferences
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