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• W2190945919 abstract "Previous work has demonstrated that the main and initiating hazard from combustible insulation materials is the onset of pyrolysis. This paper presents a methodology for designing thermal barriers for combustible insulation in buildings, which represent the main measure to control this hazard. A series of potential design tools are developed in order to determine the relationship between the different design parameters, and therefore, define the optimum thickness and thermal properties from the thermal barrier for a series of fire inputs. Introduction At present, the use of insulation materials in the built environment is drastically increasing due to requirements for improved energy performance of buildings around the world. However, most of the insulation materials used in the European market comprise of plastic organic foams such as polyurethane, polyisocyanurate, phenolic foam or expanded polystyrene, which by definition are combustible. Since these materials are characterised by their low thermal inertia, very modest amounts of energy are required for achieving the onset of pyrolysis at the surface. Thus, the main hazard from combustible insulation materials is represented by the onset of pyrolysis, resulting in the significant release of flammable volatiles. Previous work has demonstrated that this is to be considered as the main and initiating hazard from combustible materials [1, 2], which may be represented as a critical temperature, equivalent to the concept of ignition temperature in solids [3, 4]. Control measures for this hazard lie in the design of effective noncombustible thermal barriers to delay the arrival of the thermal wave at the insulation layer. A tool for the quantitative design of barrier parameters, such as thickness and thermal properties as a function of heat flux inputs from the fire, is proposed herein. This approach will allow for the performance-based design of building assemblies to be carried out on the basis of a particular failure criterion defined for thermal insulation materials [1]. Design strategy The safe use of insulation materials in assemblies lies in assuring that the onset of pyrolysis conservatively defined by the authors as a critical temperature [3] is not achieved by its surface. The instant at which the surface of the insulation achieves the critical temperature is defined as the critical time, which is particular to specific conditions of heat exposure and material properties of the thermal barrier and insulation. Therefore, the goal from performance-based designs of assemblies is to guarantee no involvement of the insulation to heat release contribution or generation of toxic effluents for a specific time, judiciously determined by the practitioners.  Corresponding author: juahime@gmail.com Proceedings of the 2 IAFSS European Symposium of Fire Safety Science The definition of the problem that allows prediction of the critical time is based on the resolution of the heat of conduction equation for two media in contact, represented in Fig. 1, and defined in Eqs. (1) to (5): ��net ′′ = −kb ∙ δT δx | x=0+ for x = 0 (1)" @default.
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• W2190945919 date "2015-01-01" @default.
• W2190945919 modified "2023-09-26" @default.
• W2190945919 title "Design Tool for the Definition of Thermal Barriers for Combustible Insulation Materials" @default.
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