How does water mist work?
Water mist is created by forcing water through a specialised nozzle at high pressure (in the case of Automist, 80 to 85 atmospheres). The fire creates a draught, with low pressure at its base drawing in air and now entraining the water droplets. As the droplets are rapidly turned to steam, a substantial portion of the fire’s output heat is used up providing the latent heat of vaporisation for this process. At the same time, the volume of the droplets expands by a factor of 1600 upon boiling, driving out oxygen and suppressing the fire. Water droplets also screen radiative heat transfer across the room. This combination makes high-pressure water mist unique.
