Fire alarm linkage control of natural smoke exhaust system

Table of Contents

The natural smoke exhaust system consists of openable external windows or openings with smoke exhaust function, which utilize the buoyancy of fire hot smoke airflow and external wind pressure to directly exhaust the smoke inside the building to the outside through the building openings.

Places that adopt natural smoke exhaust systems should be equipped with natural smoke exhaust windows (openings).

Natural smoke exhaust windows are openable external windows or openings with smoke exhaust function, which can be opened through automatic, manual, temperature controlled release and other methods.

Natural smoke exhaust windows (openings) should be equipped with manual opening devices (on-site manual). For natural smoke exhaust windows (openings) located at high positions that are not easy to open directly, a manual opening device should be installed at a height of 1.3m to 1.5m from the ground.

For atrium with a clearance height greater than 9m, business hall, exhibition hall, multifunctional hall and other places with a building area greater than 2000m2, centralized manual opening devices and automatic opening facilities should also be installed. The specific explanation is as follows:

When it is difficult to set up manual opening devices in two locations, they can be divided into zones and groups for centralized setting. However, it should be ensured that all natural smoke exhaust windows in any smoke prevention zone can be opened uniformly (on-site centralized manual), and should be set near personnel evacuation exits.

When the system is equipped with an automatic fire alarm system, the natural smoke exhaust window should have on-site temperature control release, on-site manual, on-site centralized manual, and fire automatic alarm system linkage functions.

The on-site temperature control release function refers to the control method linked by temperature release devices. In the event of a fire, when the temperature of the smoke exhaust window reaches a certain value, the smoke exhaust window will automatically open. The automatic smoke exhaust window with temperature control function should have a temperature control release temperature that is 30 ° C higher than the ambient temperature and less than 100 ° C.

When the fire automatic alarm system is automatically started, the linkage function of the fire automatic alarm system should be triggered by the alarm signals of two independent fire detectors (or one fire detector and one manual fire alarm button) in the same smoke prevention zone as the linkage trigger signal for the opening of the natural smoke exhaust window. The fire linkage controller should be linked to control the opening of the natural smoke exhaust window and stop the air conditioning system of the smoke prevention zone. The automatic smoke exhaust window should be opened within 60 seconds or less than the time when the smoke storage compartment is filled with smoke.

When using the automatic fire alarm system to start automatically, the linkage function of the automatic fire alarm system should be triggered by the alarm signals of two independent fire detectors (or one fire detector and one manual fire alarm button) in the same smoke prevention zone as the linkage trigger signal for the opening of the natural smoke exhaust window. The fire linkage controller should be linked to control the opening of the natural smoke exhaust window and stop the air conditioning system of the smoke prevention zone. The automatic smoke exhaust window should be opened within 60 seconds or less than the time when the smoke storage compartment is filled with smoke.

It should be noted that when the system is equipped with an automatic fire alarm system, the opening of natural smoke exhaust windows should be manually controlled on the fire linkage controller in the fire control room.

When there are multiple natural smoke exhaust outlets in the same smoke prevention zone, zone control can be set on the linkage controller to activate all natural smoke exhaust outlets in the same smoke prevention zone with one click.