Quantitative analysis for impact of first floor overhead on natural ventilation under different building densities and plot ratios

Taking the ratio of outdoor comfort zone, and the average wind speed in building groups, quasi static air zone and comfort zone as indexes, quantitatively analyses the impact of first floor overhead on natural ventilation under different building densities and plot ratios with PHOENICS software. The results show that the building overhead can improve the air distribution environment of building groups, especially for the building groups with high building density and low plot ratio.