Compartment fire temperature : a new simple calculation method

U. Wickström, Alexandra Byström
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引用次数: 5

Abstract

In this paper a new simple calculation method for compartment temperatures is derived. The method is applicable to post-flashover ventilation controlled fires. A parameter termed the ultimate compartment fire temperature is defined as the temperature obtained when thermal equilibrium is reached and thick compartment boundaries cannot absorb any more heat from the fire gases. This temperature depends only on the product of the heat of combustion and the combustion efficiency over the specific heat capacity of air. It is, however, independent of the air mass flow rate, and of the fire compartment geometry and the thermal properties of the compartment boundary materials. These parameters on the other hand govern the rate at which the fire temperature is increasing towards the ultimate temperature. It is shown how the fire temperature development as a function of time in some idealized cases may be calculated by a simple analytical closed form formula. The fire temperature developments of two types of compartment boundaries are presented, semi-infinitely thick and thin structures. It is also shown that for the semi-infinite case, the solution resembles the standard ISO 834/EN 1363-1 curve and the parametric fire curves according to Eurocode 1, EN 1991-1-2.
舱室火灾温度:一种新的简便计算方法
本文提出了一种新的舱室温度的简便计算方法。该方法适用于闪络后通风控制火灾。一个被称为终极隔间火灾温度的参数被定义为达到热平衡时所获得的温度,而较厚的隔间边界不能从火灾气体中吸收更多的热量。这个温度只取决于燃烧热和燃烧效率除以空气比热容的乘积。然而,它是独立的空气质量流速,以及火室的几何形状和室边界材料的热性能。另一方面,这些参数决定了火灾温度向极限温度升高的速度。在某些理想情况下,火灾温度随时间的变化可以用一个简单的解析封闭公式来计算。给出了半无限厚结构和薄结构两类隔室边界的火灾温度变化规律。对于半无限情形,解与标准ISO 834/EN 1363-1曲线和欧洲规范1,EN 1991-1-2的参数火灾曲线相似。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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