Influence of inlet area on thermal natural ventilation in rooms

Inlet area reflects geometric factor of buildings, and it is one of the main influence factors on thermal natural ventilation. To the civil building with inside heating source, using the technique of CFD (computational fluid dynamics), changing the area of air inlet, and simulating the fluid field of the thermal natural ventilation, this paper presents the natural ventilation rate and the temperature difference between inlet air and exhaust air of different conditions, analyses the temperature field and velocity field in different conditions, gives the variation trends of thermal stratification height and Effective thermal coefficient with different inlet areas. The simulation results can provide theory foundation for natural ventilation systems design.