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Assessment of extinguishing efficiency of hybrid system using water mist and inert gas during class A fires

机译：评估A级火灾中使用水雾和惰性气体的混合动力系统的灭火效率

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Fixed hybrid fire extinguishing system, a new technology used in fire protection all over the world in the last years, was discussed. A four-head twin pipe system supplied with water mist and inert gas (air or nitrogen) was applied. A pile of 50 pine wood boards was used as a combustible material (class A fire). It was located in the corner of the compartment while the nozzles were mounted symmetrically in the centre (volume suppression). The extinguishing processes differing in the proportion of water mist to gas were analysed. The extinguishing time was taken as the most important parameter indicating the extinguishing efficiency. The impact of water flow on extinguishing process was discussed. The clear dependence of extinguishing time on the water/gas ratio was proven. The best performance of the hybrid system at water flow 3 dm3/min and nitrogen as inert gas was observed. The results obtained during experiments can be useful in developing new international standards e.g. NFPA.
机译：讨论了固定式混合灭火系统，这是近几年来世界范围内用于消防的一项新技术。使用四头双管系统，该系统配有水雾和惰性气体（空气或氮气）。一堆50张松木板用作可燃材料（A级火）。它位于隔室的角落，而喷嘴对称地安装在中央（抑制体积）。分析了水雾与气体比例不同的灭火过程。灭火时间是指示灭火效率的最重要参数。讨论了水流对灭火过程的影响。证明了灭火时间对水/气比率的明显依赖性。观察到混合系统在水流量3 dm3 / min和氮气作为惰性气体时的最佳性能。实验期间获得的结果可用于制定新的国际标准，例如NFPA。

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