Vertical shaft pressure changes due to venting and pressurization

1. Venting (opening of natural ventilation elements such as exhaust windows): Opening of a vent increases the leakage gap area at the height where it is located. Therefore, it plays a role in pulling the neutral band to the venting position(Refer to the Figure 7.9 of "Smoke Movement and control in High-rise Buildings - George T. Tamura, P.E/1994").



2. Outside air Supply to the vertical shaft : Pressurization by the supply of outside air moves the vertical shaft pressure line to the right, and the resulting temperature change causes the slope of the pressure line to approximate that of the outside air. The volume flow rate of pressurization and the amount of parallel movement of the vertical shaft pressure line to the right are proportional.




#Vertical #shaft #pressure #changes #venting #pressurization

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