Smoke control in HVAC system for more number of floors


#1

An HVAC system can be implemented to serve on many floors. The normal HVAC system that serves all the floors of a building is shown below. For this building, the stairwells are pressurized in the event of a fire. The distribution ducts on each floor are shown in the picture.

Smoke control by pressurization and exhaust:

In the event of fire in the system:

  • The smoke damper in the return duct is open on the fire floor
  • The rest of the smoke damper in the return duct are closed
  • The smoke damper in the supply duct on the floor directly above and below the fire floor are open
  • The rest of the smoke dampers in the supply duct are closed.

These damper settings are intended to:

  • Concentrate exhaust on the fire floor
  • Concentrate pressurization on the floor above and below the fire floor
  • Prevent smoke from migrating to other zones through the return duct.

For this zoned smoke control system, the mode of operation of penthouse is explained in: click here

Smoke control by exhaust only:

The zoned smoke control consisting of the fire floor exhaust and exhaust of floor directly above and below the fire floor. In the event of fire in the system:

  • The smoke damper in the return duct are open on the floor and floor directly above and below the fire floor.
  • The rest of the smoke damper in the return duct is closed.
  • All smoke damper in supply duct are closed.