A major occupancy-controlled parameter affecting inter-zonal air movements is the internal door. Pressure-driven flows around an internal door in closed and partly open positions are measured. For closed doors, the strong influence of under-door clearance is observed and the crack flow regime is dominant. Even for small openings of doors, the transition to orifice flow is observed, giving a discharge coefficient of around 0.6.
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References
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Baker P.H., Sharples S. and Ward I.C.Air flow through asymmetric building cracks BuildingServ. Eng. Technol. 7(3) 107-108 (1986)
