بهبود طراحی محیط باد با استفاده از ارزیابی توزیع فضایی بهره وری تهویه در فضای منطقه ای

This paper discusses the influence of design variations on spatial distribution of Ventilation Efficiency (VE) in idealized residential building groups. Series of design cases referring building length and spacing changing are investigated using Computational Fluid Dynamics (CFD) simulation method. Air change rate (ACH) and purging flow rate (PFR) are adopted as evaluation indices of ventilation efficiency. Simulation results indicate that these design changes have evident effects on distribution of spatial ventilation efficiency. Widening building spacing could improve ventilation efficiency of different spaces. However, the benefit is not linear improved as spacing distance increases. When the distance is higher than 15m, improving extent of spatial ventilation efficiency decreases evidently. Variations of building length also has effect on distribution of spatial ventilation efficiency. As building length increase, less wind could reach into space between south and north buildings, which lead to the decrease of wind ventilation for middle residential-unit. Preliminary study indicates that building length should be restricted within 5 residential-unit.