A simple correlation for monitoring the ignition propensity of wet nordic spruce wood

Mindykowski, Pierrick; Jørgensen, Martin Felix; Svensson, Staffan; Jomaas, Grunde

doi:10.1016/j.firesaf.2018.08.001

Cited by 9 publications

(2 citation statements)

References 26 publications

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“…Images of the samples exposed to a 5 kW radiant panel heat are presented in Figure 12, and those exposed to a 10 kW radiant panel heat are shown in Figure 13. Mindykowski [60] used the time to ignition for a piece of wet spruce and compared it to the time to ignition of dry wood to create a model. One of the reasons for their results is that the ignition temperature in the experiments (directly linked to the intercept heat flux) was constant for both the dry and the moist wood [13,55,[61][62][63][64].…”

Section: Resultsmentioning

confidence: 99%

Study of the Influence of Heat Flow on the Time to Ignition of Spruce and Beech Wood

Harangozó,

Tureková,

Marková

et al. 2024

Applied Sciences

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Adherence to fire safety regulations for wood is one of the most important tasks in its use in structural and architectural applications. This article deals with determining the influence of heat flux on the ignition process of spruce (Picea abies L. Karst.) and beech wood (Fagus sylvatica L.). The heat flux was generated by an electric radiant panel. The analysed parameters included the ignition time of the spruce and beech wood samples, the influence of wood density, and sample moisture, and the course of sample combustion, both with and without flame, was observed. The heat flux was maintained at constant values, depending on the distance of the examined sample from the panel, along with the specific power of the radiation panel. The power of the radiation panel was set to constant values of 5 kW and 10 kW. The samples were placed at distances of 50, 70, 100, 150, and 200 mm from the heat source, and heat fluxes in the range of 13–92 kW·m−2 were observed. At a power of 5 kW and a heat flux of 64 kW·m−2, neither the sample of beech nor that of spruce wood, placed at the distance of 100 mm from the radiation panel, exhibited flaming combustion. The ignition time for the beech wood was approximately twice that of the spruce wood, likely due to the higher average wood density. It can be stated that wood density, as one of the main factors, significantly influences the ignition phase of burning. The statistical analysis examined variables including wood type, radiant panel output, distance, and heat flux in relation to ignition time. The analysis revealed a significant difference between ignition time and distance (p-value = 0.0000, H = 37.51583) as well as between ignition time and heat flux (p-value = 0.0000, H = 37.69726). Similarly, the time to ignition for all tested beech wood samples was longer than for spruce wood.

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Section: Resultsmentioning

confidence: 99%

Study of the Influence of Heat Flow on the Time to Ignition of Spruce and Beech Wood

Harangozó,

Tureková,

Marková

et al. 2024

Applied Sciences

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show abstract

“…To achieve this, a value for the ignition temperature must be estimated. Due to the development of the model, the most convenient way to achieve this objective is to use the critical heat flux criterion as treated by several authors [15,16,47,48,49]. However, defining an ignition temperature permits the use of the t vs. q correlations.…”

Section: Ignition Delay Timementioning

confidence: 99%