A Study on Modeling of Fire in Small Scale Buildings (2) - Modeling on Heat Transfer in Fire -

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  • TANAKA T.
    Building Research Institute, Ministry of Construction

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  • 小規模建築物の火災のモデル化に関する研究 (2) ―火災時の熱移動のモデル化―
  • ショウキボ ケンチクブツ ノ カサイ ノ モデルカ ニカンスルケンキュウ 2

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For analysis of fire, it is important to properly estimate the heat release by combustion and various heat transfers. <br>The calorific values of the combustion in actual fires differ from experimental one because the fuels contain water, the fuels leave residual char, and the formation systems do not go back to standard temperature of original system. It is necessary to clarify the relation between the two combustions, because we have to estimate the heat release in actual fire from experimental calorific value. For this purpose, we introduce a simple model of wood pyrolysis which is based on Thomas et al., and the definition that pyrolysis means to pyrolyze combustibles into elementary composition, C, H2, O2. Using the model and the definition, we can easily estimate latent heat of pyrolysis and heat release of the material whose elementary compositions and experimental overall calorific value are known. <br>We can effectively estimate thermal radiation heat transfer by assuming that hot gas is gray and developing Net-Radiation Method. Of course we have to simplify the heat transmission system, because spaces in buildings are in general very complex. But in many practical cases in the analysis of actual fire, considerable simplification may be acceptable.

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