Numerical Study of Smoke Spread upon Shaft-box Type Double Skin Facades

This paper presents numerical studies of smoke movement in the double skin facades type of Shaft-box. The room size is constructed with the reference of ISO9705 while the cavity width is selected to be 1m as the maximum fire hazard width. It turns out that when the smoke in the shaft is steady, the temperature in the shaft will change exponentially along with the height. Once the smoke enters the cavity, the toxicity hazard of smoke on the roof floor is the largest, under the action of "Stack Effect" and buoyancy created by the fire. And the room on the roof floor near the shaft towards the fire room is the most dangerous. The CO concentration of Room 3 on the roof floor reaches 200ppm within 4.5 min after the internal panes break.