Parameterising study of tunnel experiment materials for application to the Fire Dynamics Simulator pyrolysis model

Wang, Xiaoyun; Fleischmann, Charles; Spearpoint, Michael

doi:10.1177/0734904116667738

Cited by 9 publications

(3 citation statements)

References 31 publications

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“…The same schemes are considered in other recent works on modeling of wood pyrolysis under cone calorimeter. 16,24 The parallel reactions scheme can accurately reproduce the results of small-scale experiments (TGA, DSC, MCC) but comes at a cost of increased model complexity.…”

Section: Reaction Schemesmentioning

confidence: 99%

A model for the pyrolysis of two Nordic structural timbers

Rinta-Paavola

Hostikka

2021

Fire and Materials

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Performance-based design of the timber structures' fire resistance is often based on the reduced cross section and thus relying on empirical and numerical assessment of the charring propagation. The current work aims to construct models for the pyrolysis of spruce and pinewoods to allow coupled simulations of the cross-section reduction and burning rate in fire models. Kinetic models are formulated based on thermogravimetric data and supported by the heats of pyrolysis and combustion measurements by differential scanning calorimetry and microscale combustion calorimetry, respectively. The results from these small-scale measurements are consistent with each other, and the heats of pyrolysis and combustion are determined for the wood primary components by fitting the simulations to the experimental results. Heat release models are constructed based on the small-scale tests, and cone calorimeter experiments are used for the estimation of the physical properties and for the heat release model validation.charring, pine wood, pyrolysis modelling, spruce wood | INTRODUCTIONRecent years have seen growing interest in ever higher timber buildings. Often, their planning process calls for the performance-based fire safety design, that is, the use of engineering methods instead of strictly adhering to prescriptive building codes to guarantee the required safety level. 1 The fire consequence assessment in performance-based fire safety design commonly relies on design fires that describe the evolution of the heat release rate over time, based on the expert judgment or a synthesis of relevant experiments. 2 A material model that couples

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Section: Reaction Schemesmentioning

confidence: 99%

A model for the pyrolysis of two Nordic structural timbers

Rinta-Paavola

Hostikka

2021

Fire and Materials

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“…Wang et al [23] described a multiple-component decomposition scheme where the overall decomposition rate, dα/dt is the summation of the decomposition rate of each component, (dα/dt) i based on the respective mass fraction, c i as per Eq. (3).…”

Section: Kinetic Properties and Heat Of Reactionmentioning

confidence: 99%

“…( ) The refinement of kinetic properties introduced by Wang et al [23] is also applied to refine n and c i to achieve a reasonable comparison between the model and experimental dα/dT. The refinement is qualitatively based on matching the peak values of each reaction, between the model and the experiment.…”

Section: Kinetic Properties and Heat Of Reactionmentioning

confidence: 99%

Thermal decomposition of flexible polyurethane foams in air

Pau

Fleischmann

Delichatsios

2020

Fire Safety Journal

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The oxidative thermal decomposition of a non-fire retardant and a fire retardant polyurethane foam is investigated over 1-60 °C/min of heating rate. From the thermogravimetry results under the oxidative environment of air, additional oxidative reactions which are heating rate dependent compete with the pyrolysis reactions over similar temperature range. The decomposition behaviour differs for the foams and the heating rates investigated. Due to the presence of fire retardant additives, the oxidative thermal decomposition from heating rates of 1-20 °C/min occurs at a higher rate and over a narrower temperature range for the fire retardant foam. However, at 60 °C/min, the fire retardant foam shows a reduced decomposition rate spreading over a wider temperature range. This shows the fire retardant foam can decompose rapidly at low heating rate, under the condition of low temperature with ample of oxygen. This is similar to the incipient phase of a fire, and ignition inhibition is possible when coupled with the gas phase fire retardant mechanisms of the fire retardant foam. The char residue formed by the solid phase fire retardant mechanism slows the decomposition rate, and as the heating rate increases, the decomposition extends over a greater temperature range due to improved thermal stability. For both foams, the increase in heating rate shows a gradual reduction to the influence from oxidative reaction of foam, shifting towards the pyrolysis reaction of polyol. Kinetic properties of Arrhenius equation governing the decomposition rate are estimated graphically using the Inflection Point Methods and the model shows reasonable agreement with the experimental results. From the heat flow results, the heat of reaction for the oxidative thermal decomposition of foams is calculated and is found to be exothermic.

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