ASSESSMENT OF THE EFFICIENCY OF FIRE EXTINGUISHING SYSTEMS
DOI:
https://doi.org/10.33042/2522-1809-2024-1-182-159-164Keywords:
fire extinguishing system, extinguishing time, efficiency criterionAbstract
As previously shown, many indicators characterise the quality of fire extinguishing systems. The most common quality indicator is fire extinguishing time. For fire extinguishing systems focused on extinguishing Class B fires using sprayed water, the authors have constructed a transcendental equation, the root of which is the fire extinguishing time. We derived the equation provided that the intensity of the sprayed water supply to the combustion centre to be described by the Heaviside function. The dynamic properties of fire are defined using the integral Laplace transform. We obtained the functional dependence of class B fire extinguishing time on fire
parameters and showed that this time does not exceed a tenth of the constant fire time. In the first approximation, the inertial properties of the fire extinguishing system can be taken into account by the transfer function of an aperiodic link with a generalised time constant. For this case, we constructed a transcendental equation that determines the fire extinguishing time by the inertial fire extinguishing system. We note that, according to inertial properties, fire extinguishing systems fall into three classes. For each of the three classes, estimates of the extinguishing time of a class B fire were obtained, depending on the dynamic properties of this fire. The results show that this time can change several times. The authors have introduced the criterion for the efficiency of fire extinguishing systems, which characterises the degree of approximation of the speed of the fire extinguishing system to the maximum possible value. This criterion also indicates how much it is necessary to increase the extinguishing agent mass supplied per unit area of the fire relative to the extinguishing agent mass supplied in leaps per unit area of the fire, provided that the extinguishing times are the same. We obtained estimates of the effectiveness of fire extinguishing systems using this criterion. Furthermore, we provided recommendations on the use of the efficiency criterion.
References
Jeong, C. S., & Lee, C. Y. (2021). Experimental investigation on spray characteristics of twin-fluid nozzle for water mist and its heptane pool fire extinguishing performance. Process Safety and Environmental Protection, 148, 724–736. https://doi.org/10.1016/j.psep.2021.01.037
Shrigondekar, H., Chowdhury, A., & Prabhu, S. V. (2021). Performance by Various Water Mist Nozzles in Extinguishing Liquid Pool Fires. Fire Technology, 57, 2553–2581. https://doi.org/10.1007/s10694-021-01130-0
Shrigondekar, H., Chowdhury, A., & Prabhu, S. V. (2020). Characterization of solid-cone simplex mist nozzles. Fire Safety Journal, 111, 102936. https://doi.org/10.1016/j.firesaf.2019.102936
Liu, T., Yin, X.-Y., Liu, Y.-C., Tang, Y., Huang, A.-C., Dong, X.-L., & Liu, Y.-J. (2022). Influence of Water Mist Temperature Approach on Fire Extinguishing Effect of Different Pool Fires. Processes, 10(8), 1549. https://doi.org/10.3390/pr10081549
Wang, J.-D., He, Y.-H., & Tao, B. (2021). Inhibition effect of water mist with single and double nozzles on n-heptane pool fire. Fire Science and Technology, 40(5), 696–700. https://www.xfkj.com.cn/EN/Y2021/V40/I5/696
Dasgotra, A., Rangarajan, G., & Tauseef, S. M. (2021). CFD-based study and analysis on the effectiveness of water mist in interacting pool fire suppression. Process Safety and Environmental Protection, 152, 614–629. https://doi.org/10.1016/j.psep.2021.06.033
Liu, Y., Fu, Z., Zheng, G., & Chen, P. (2022). Study on the effect of mist flux on water mist fire extinguishing. Fire Safety Journal, 130, 103601. https://doi.org/10.1016/j.firesaf.2022.103601
Liu, Y., Chen, P., Fu, Z., Li, J., Sun, R., & Zhai, X. (2023). The investigation of the water mist suppression pool fire process’s flame expansion characteristics. Journal of Loss Prevention in the Process Industries, 81, 104927. https://doi.org/10.1016/j.jlp.2022.104927
Lu, D., Tan, W., Zhu, G., & Liu, L. (2019). Gasoline fire extinguishing by 0.7 MPa water mist with multicomponent additives driven by CO2. Process Safety and Environmental Protection, 129, 168–175. https://doi.org/10.1016/j.psep.2019.07.002
Tarakhno, O. V., & Sharshanov, A. Ya. (2004). Physico-chemical bases of use of water in firefighting: study guide. Academy of Civil Protection of Ukraine. http://www.univer.nuczu.edu.ua/tmp_metod/472/FHOVVvPS.pdf [in Ukrainian]
Abramov, Yu., & Basmanov, O. (2017). Models and characteristics of the process of extinguishing Class B fires. LAP Lambert Academic Publishing.
Shevchuk, V. H., & Polishchuk, D. D. (2010). Physical foundations of fire and explosion hazard: study guide. Astroprynt [in Ukrainian]
Dwight, H. B. (1957). Tables of integrals and other mathematical data (3rd ed.). The Macmillan Company. https://www.dce.uni-sofia.bg/shares/pk/Mathematics-for-Pharmacy-BG/Dwight.%20Tables%20of%20Integrals.pdf
Kotov, A. H. (2003). Fire extinguishing and security systems. Repro-Hrafika.
Abramov, Yu. O. (1993). Fundamentals of fire automation. KhIPB MVS Ukrainy.
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