Network simulation for stairwell pressurization supply air system in high-rise buildings with influence of stack effect and wind pressure

Taking two high-rise buildings as examples, simulates the influence of the stack effect and the wind pressure on the stairwell pressurization supply air system separately and simultaneously with the network simulation software CONTAM3.0. The result shows that the building height, the temperature difference between inside and outside of the building, the direction and magnitude of outdoor wind velocity will all have an effect on the stairwell pressurization supply air system. The stack effect caused by the temperature difference between inside and outside of the building will result in redistribution of pressure in the stairwell, and the stack effect is very likely to cause the pressure in the stairwell smaller than the safety threshold, which may cause the stairwell pressurization supply air system fail. With the coupling of  the stack effect and the outdoor wind pressure, the most unfavorable situations occur when the windward fire room is on upper floor in summer or on lower floor in winter, in which the pressure difference between lobby and corridor is down to about 6 Pa, which is much less than 25 Pa stipulated in the standards, and that may cause the malfunction of stairwell pressurization supply air system.