The present work tries to clarify by experimental results, some phenomenological aspects concerning the use of water mist jet of different temperature for the liquid fuel fire suppression. In order to study the effectiveness of the suppression of an ethanol pool fire with one water mist nozzle, a series of experiments were conducted under different conditions in a closed space. The water temperature generating water mist ranged from 15 °C to 30 and 40 °C. The temperatures graphics in three points situated above the flame at different heights, throughout all the 15 fire suppression tests, allowed the authors to present findings concerning different effects and limitation of suppression, for each temperature (15, 30 and 40 °C). Due of its behaviour, the water mist systems are now used including in electrical zones.

Keywords: Ethanol fire suppression, Water mist jet, Warm water, Water droplets, Suppression time, Flame suppression.