Impact of green walls on ventilation and heat removal from street canyons: Coupling of thermal and aerodynamic resistance

Green walls are considered a sustainable and environmental technology for improving the local urban microclimate. The presented wind tunnel measurements reveal coupling effect of aerodynamic thermal resistance green in flat steep street canyons simplified neighborhood model. building ground surfaces set to conditions at series Richardson numbers (Ri) ranging from 0 2.07. induce flow due their high skin friction large volume-specific surface areas, which leads formation thick boundary layer near walls, where hot air is trapped. These layers weaken convective heat transfer canyon, leading an temperature reduction canyon. lower reduces strength buoyancy, which, together with resistance, results speed, turbulence kinetic energy (TKE), ventilation more significant non-isothermal conditions, particularly entrainment roof level reduced by 32.4% isothermal condition, removal up 91.5% (Ri Ris = 2.07). alter structures suppressing downward flow, canyon-wide vortical ascending buoyant flow.