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Abstract
The well-designed ventilation system ensures thermal comfort, indoor air quality and yield energy saving by avoiding excessive high values of airflow rate. The current CFD research investigates the performance of stratum ventilation in an office during the winter by using five values of the air change per hour, changing the exhaust location, and changing the supply location. In addition, the numerical model studied the displacement ventilation and mixing ventilation during the winter, and their results were compared with that of stratum ventilation. Finally, the stratum ventilation during the summer was simulated at five values of the air change per hour