Predicting intumescent coating protected steel temperature in fire using constant thermal conductivity

Li, Guo Qing; Han, Jun Hyun; Lou, Guo Biao; Wang, Yongchang

doi:10.1016/j.tws.2015.03.008

Cited by 40 publications

(13 citation statements)

References 15 publications

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“…Furthermore, using constant thermal conductivity, the effects of steel section factor and coating thickness can be incorporated through regression analysis. For this purpose, Li et al 24 explored and demonstrated the feasibility of using a constant effective thermal conductivity for intumescent coatings for calculating the temperatures of protected steel section in fire, based on analysing a limited number of fire tests on intumescent coating–protected steel sections with different steel section factors and intumescent coating thicknesses. The constant thermal conductivity is defined as the temperature-averaged effective thermal conductivity value within the temperature range of interest for fire resistance design of steel structures.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of this article is to present comprehensive results to substantiate the constant effective thermal conductivity concept and to investigate how the constant effective thermal conductivities of intumescent coatings vary with steel section factor and coating thickness. For this purpose, this article has collected a large amount of fire tests data, including Li et al, 24 Zhang et al 19 and Jia. 25 These data are then analysed based on curve fitting to establish constant effective thermal conductivity–coating thickness/steel section factor relationships.…”

Section: Introductionmentioning

confidence: 99%

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Constant effective thermal conductivity of intumescent coatings: Analysis of experimental results

Han

Wang

2017

Journal of Fire Sciences

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This article presents the results of an investigation to obtain the constant effective thermal conductivities of intumescent coatings under the influence of different intumescent coating factors (type of intumescent coating, coating thickness, steel section factor, fire condition), based on the analysis of an extensive collection of fire test data. The constant effective thermal conductivity is not a fundamental property of the intumescent coating, but is a desired quantity for simplified practical fire resistance design. It is defined as the temperature-averaged value of the temperature-dependent effective thermal conductivity within the temperature range of interest for fire resistance design of steel structures. The results indicate that for each of the intumescent coating types examined, a consistent constant effective thermal conductivity exists. The constant effective thermal conductivity tends to increase with decreasing steel section factor and to decrease with increasing coating thickness. For intumescent coating–protected steel I-sections, incorporating the shadow effect gives more consistent values of constant thermal conductivity compared to those without accounting for the effect. The same constant effective thermal conductivity obtained from the ISO fire tests may be used for different fire conditions as long as the steel temperature is higher than 400 °C. The results of this research make it possible to develop a simple method to calculate temperatures of intumescent coating–protected steel sections under different fire conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Constant effective thermal conductivity of intumescent coatings: Analysis of experimental results

Han

Wang

2017

Journal of Fire Sciences

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“…Coatings in particular and coating systems in general play welldefined actions against fire action [7][8][9][10][11][12][13][14][15][16][17][18][19]; they may…”

Section: Fire Action On Materialsmentioning

confidence: 99%

Introductory Chapter: Protection of Materials

Canosa¹,

Giúdice²

2017

New Technologies in Protective Coatings

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Additional information is available at the end of the chapter http://dx.doi.org/10.5772/intechopen.69853 IntroductionThe science and technology of materials have as objective provided access to specific knowledge in this field and besides generated matters of interest for the development of original researches leading to new materials and, as a consequence, to proper protection methods to achieve high economic impact.Since iron and steels constitute a group of widely used materials in civil and industrial construction, this chapter describes firstly the fundamental concepts of metal corrosion and the most frequent failures originating on service. Besides, in this chapter, it was considered of interest to include aspects inherent to the physicochemistry of fire and its mechanism of spreading because of the significant human and material losses produced year after year by action of the fire.It is appropriate to mention that the different chapters of this book describe innovative methods of surface treatment to control the kinetics of metallic corrosion and the action of fire on several materials. Metallic corrosion and failuresAccidents arising from the metallic corrosion can produce injury or death of people by explosion, fire, and so on. The economic losses are classified into direct and indirect; the first includes the replacement of corroded materials, labor, periodic maintenance (coatings, cathodic protection, inhibitors in closed circuits, etc.) while the last involve aspects such as the discontinuity in the productive system, the loss and the contamination of raw materials and finished goods, and so on. The indirect losses are usually between 8 and 10 times the direct ones.In industrialized countries, the total economic losses reach values between 3.5 and 4.5% of gross national product, despite applying all available technologies. It should also be mentioned

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“…Li et al [27] proposed the use of a constant equivalent thermal conductivity within a certain temperature range to predict the temperature of the protected steel. Staggs [28] built a numerical model by combining the digital image and the void fraction information of the fully expanded char layer to calculate the effective thermal conductivity by using the finite element method.…”

Section: Introductionmentioning

confidence: 99%

Combined Heat Transfer Mechanisms in the Porous Char Layer Formed from the Intumescent Coatings under Fire

Zhang

2021

Coatings

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This study examines the combined heat transfer by thermal conduction, natural convection and surface radiation in the porous char layer that is formed from the intumescent coating under fire. The results show that some factors, such as the Rayleigh number, conductivity ratio, emissivity, radiation–conduction number, void fraction and heating mode have a certain effect on the total heat transfer. In addition, the natural convection of the air in the cavity always inhibits surface radiation among the solid walls and thermal conduction, and the character of the total heat transfer is the competition result of the three heat transfer mechanisms.

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Predicting intumescent coating protected steel temperature in fire using constant thermal conductivity

Cited by 40 publications

References 15 publications

Constant effective thermal conductivity of intumescent coatings: Analysis of experimental results

Constant effective thermal conductivity of intumescent coatings: Analysis of experimental results

Introductory Chapter: Protection of Materials

Combined Heat Transfer Mechanisms in the Porous Char Layer Formed from the Intumescent Coatings under Fire

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