Temperature dynamics in spruce wood under fire

The potential risk of fire and burns is one of the biggest disadvantages of using wood as a building material. The cone calorimeter method was used to experimentally determine the burning process of spruce wood, which allows the reaction to the fire class according to the official EU classification system according to EN 13501-1: 2018. Using the experimental data, the dynamics of temperature change in different sample thicknesses was determined. The time required for moisture to evaporate closer to the surface of the flame is shorter than away from the surface, and the rate of temperature rise is much faster. When processing the experimental data, it was found that the influence of the sample thickness is significantly preserved up to the degree of 3, which indicates that the temperature distribution surface is inflection in relation to the thickness. The proposed mathematical model for the determination of temperature changes in wood during its combustion process shows a sufficiently good agreement with the experimental data and can be used to determine the temperature distribution in wood during the combustion process.