Study of the effect of top and bottom hung windows on smoke control in stairwells
In order to study the role of smoke control of top and bottom hung windows in stairwells,the relative smoke removal efficiency,relative coil suction efficiency,and smoke temperature of hung windows are analyzed by numerical simulation for different fire source positions,window opening angles,and external wind speeds.The results show that:the chimney effect in the stairwell has less influence on the smoke exhaust of the top window;when the outside wind speed is less than 3 m/s under the same environmental conditions,the overall smoke exhaust effect of the bottom window is generally higher than that of the top window by 12.1%～37.2%,and the overall cold air suction effect of the top window is generally higher than that of the bottom window by 2.9%～15.6%;when the window opening angle is 15°～70°,the larger the window opening an-gle is,the better the smoke temperature control effect is,and the temperature control effect of the top window is better than that of the bottom window;when the window opening angle is 15°～30° and 30°～70°,the av-erage change rate ratio of the relative smoke removal efficiency and the relative volume suction efficiency is greater than 1.34,taking into consideration of the temperature control effect and the actual situation,the stair-well should be prioritized to use the top window,and the opening angle of 30° is preferable.
万方数据
维普
