材料的热释放速率是决定火灾灾害的关键因素。

The heat release rate is the key factor that determines fire hazards.

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隧道内火灾的热释放速率对火灾蔓延和烟气生成起着关键作用。

The heat release rate (HRR) of a fire in a tunnel is a crucial factor, both in terms of fire spread and smoke production.

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结果表明，含氯化铵的聚氨酯泡沫燃烧时热释放速率最小，仅是未经阻燃处理的聚氨酯泡沫的热释放速率的11.5%；

The results showed that the heat release rate of the PU foam filled with NH_4Cl was the minimum, being only 11.5% of that of the blank.

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