Abstract
The advantage of hybrid fire suppression systems is that they combine the advantages of both water mist and clean agent systems. Currently, this innovative technology is increasingly used in fixed firefighting systems. Available literature both in Polish and around the world describes this issue in a fragmentary way. Extinguishing system tests were carried out at the Main School of Fire Service in Warsaw. The impact of water mist flow rate on the temperature variability in a closed room during the extinguishing of group A fires using a hybrid water mist system was analyzed. Four different flow rates 0.5, 1.0, 1.5 and 3.0 dm3/min were applied. The temperature variability of selected points of a closed test chamber during extinguishing process are presented. The extinguishing efficiency, taking into account extinguishing time, average speed of temperature drop and other parameters, was estimated on the basis of proposed original criterion. The results obtained showed that water flow rate has a significant impact on temperature variability and included the determination of optimal water flow rate at which the extinguishing efficiency is the highest. The conducted research proved that the hybrid system is more effective than classic mist and gas systems when extinguishing group A fires.
Highlights
The first mention of hybrid systems can be found in papers [1,2] in which, in addition to discussing the typical mist systems, studies of those systems in which an additional agent in the form of inert gas was used
The results of the tests conducted by Liu and Kim in 1996 showed that the combination of water mist and inert gas improves the extinguishing efficiency compared to conventional water mist systems
A hybrid fire extinguishing system including four two-phase atomizing nozzles FEN T was the subject of the study
Summary
The first mention of hybrid systems can be found in papers [1,2] in which, in addition to discussing the typical mist systems, studies of those systems in which an additional agent in the form of inert gas was used. The beginnings of research related to hybrid systems took place over 20 years ago, more interest in hybrid systems has only occurred in recent years. An overview of these types of extinguishing systems developed by Raia and Gollner can be found in [3]. Protection of combustion turbine in enclosures with volumes not exceeding 80 m3 and 260 m3; 2. Protection of machinery in enclosures with volumes not exceeding 80 m3 and 260 m3; 3. Protection of combustion turbine and machinery enclosures with volumes exceeding 260 m3; 4.
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