Five models describing heat transfer during evaporation of the water sprayed over the forest to stop fires and to cool down the pyrolysis of the bio- top layer are established and investigated by a parametric approach. It aims to improve the understanding of the behavior and the properties of the forest combustible material (FCM). A mathematical description of FCM surfaces (needles of pine and fir-tree, leaves of birch) is established. The characteristic time td to cool down the FCM layer below the temperature of the onset of the pyrolysis is the important parameter investigated in the present work. The effective conditions were determined allowing to reach the shortest td time and the lowest consumption of e.g. water to be dropped.
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