Condensed Aerosol Fire Suppression 3
Condensed Aerosol Fire Suppression 3 : Methods of Fire Extinction: Disrupting the reactions necessary to sustain the flame's combustion, the cycle continues until the combustion's chain reactions are terminated and the flame is extinguished. Condensed aerosol agents also have secondary extinguishing mechanisms implicating the other three elements of the fire tetrahedron described above. The aerosol cools the flame by engulfing it with a cloud with large concentrations of microparticles which have mass median aerodynamic diameter sizes (MMAD) as small as 1 to 2 micrometres. Though the surface area of each microparticle is extremely small, the large quantity of particles surrounding and penetrating the flame offers a sufficiently large combined surface area to absorb the flame's heat. On the surface of the particles, recombination of the fire radicals takes place as energy is absorbed: O- + H- = OH-, H- + OH- = H2O. Flame is the gaseous part of a fire resulting from the combustion of fuel. Aerosols particles and gases mixing with the gaseous components of the flame isolate the fire's fuel. Attacking all the elements of the fire tetrahedron, condensed aerosol fire suppression agents are among the more effective flame-extinguishing agents. For example, some condensed aerosol fire suppressants can extinguish a Class B flammable liquid pool fire with 1/5th the amount of Halon 1301 agent or 1/10th the amount of a hydrofluorocarbon or fluoroketone based clean agent gaseous fire suppression system in terms of kilogram mass of agent per cubic meter
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