F-57 Study on Cross Ventilation Design and its Performance Evaluation for Residential Buildings : Part16 Relationship between the Discharge Coefficient and Opening/Outdoor Velocity Ratio and Airflow Angle in the Openings

Abstract

The experiment is conducted to examine the determinant factors of the discharge coefficient of large openings. Two large openings are set in the diagonal position. The area of one opening is changed to control the differential pressure across another opening, which is the measuring object. The wind pressure on wall and floor, and the airflow rate are measured, and the discharge coefficient is calculated. In conclusion, the discharge coefficient is clearly related to the inflow and outflow angles. The discharge coefficient has larger value when airflow passes vertically through the opening.