従来から建築物の火災フェーズに応じた火源設定の必要性が言及されてきたとおり，区画火災性状予測では，区画内の発熱(又は加熱)速度の极いが重要となる。この速度の成長規模及び変化は，火災区画では火源可燃物の重量減少速度(以下「重量減少速度」という。)と密接に関係し，可燃物に対する周囲からの放射伝熱量に依存する。また，隣接空間(火災区画に接続する空間をいう。以下同じ。)の延焼拡大初期では，火災区画開口部からの放射及び気体の流入に伴う伝熱(加熱)量に依存する。すなわち，建築物内の火災性状予測では，これらの伝熱量の予測精度が重要となる。%In the paper, the effects of three radiation heat transfer environments on prediction of compartment fire behavior are examined by using a model based on zone concept. First, a radiation heat transfer model considering diffuse reflection is formulated by using ray tracing method. And the following calculations are described by the consideration of direct and reflective heat transfers: (a) net heat gain of alayer, Q_(net) , (b) heat transfer from surroundings to a fuel,q_e , (c) heat transfer to adjacent space through to the openings, Q_R , (d) wall surface temperatures, T_w , Next the theories are incorporated into the predictive model for compartment fire behavior. From the comparison of calculations and experimental results in every environment, the effect of radiation heat transfer environment on the prediction has been cleared.
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