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    188宝金博页面版: 【精品】enclosure fire dynamics_c07

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    内容提示： 7 ? 2000 by CRC Press LLCHeat Transfer inCompartment Fires The ability to numerically estimate how much heat is transferred between a fire, the fire gases, thefuel bed, and the surfaces in an enclosure is essential for any fire hazard assessment. The energybalance is very much affected by heat being transferred from the flames and the hot gases to theenclosure surfaces and out through the enclosure openings. The heat transferred from these sourcestoward a fuel package will to a considerable extent con...

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    7 © 2000 by CRC Press LLCHeat Transfer inCompartment Fires The ability to numerically estimate how much heat is transferred between a fire, the fire gases, thefuel bed, and the surfaces in an enclosure is essential for any fire hazard assessment. The energybalance is very much affected by heat being transferred from the flames and the hot gases to theenclosure surfaces and out through the enclosure openings. The heat transferred from these sourcestoward a fuel package will to a considerable extent control the rate at which fuel evaporates andheat is released. This chapter briefly discusses convection heat transfer as applied to enclosure fires,but most of the text is dedicated to radiative heat transfer in enclosures. It is presumed that thestudent already has a background in the fundamentals of heat transfer.CONTENTS7.1 Terminology7.2 Introduction7.2.1 Background7.2.2 Modes of Heat Transfer7.2.3 Measurements7.3 Convective Heat Transfer in Fire7.3.1 Specific Convective Studies: Fire Plume Heat Transfer to Ceilings7.4 Radiative Heat Transfer in Fire7.4.1 Two Approximate Methods for Calculating Radiation from Flame to Target7.4.2 Basic Principles of Radiative Transfer7.5 Enclosure Applications7.5.1 Electrical Circuit Analogy7.5.2 First Example: Heat Flux to a Sensor at Ceiling Level7.5.3 Second Example: Heat Flux to a Sensor at Floor Level7.6 SummaryReferencesProblems and Suggested Answers 7.1TERMINOLOGYAbsorptivitythe surface, given the symbol Configuration factor, view factor, shape factormetric quantity. It gives the fraction of the radiation leaving one surface that strikes anothersurface directly. In other words, it gives the fraction of hemispherical surface area seenby a differential element when looking at another differential element on the hemisphere.Emissivity — The fraction of the radiation energy emitted in relation to the maximum possibleemission from a surface, given the symbol Extinction coefficient and absorption coefficientof how the intensity of a beam of radiation passing through a media changes with length; — The fraction of the radiation energy incident on a surface that is absorbed byα. — The configuration factor is a purely geo- ε. — The extinction coefficient is a measure

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