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- 주제어 : smoke suppression (검색결과 4 건)
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An experimental study for the flow rates of automatic pressure smoke dampers and their applications
이민정,Seung Il Park,김남일 대한기계학회 2013 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.27 No.5
Smoke spread from a fire is a major cause of mass casualties. To suppress smoke spread, escape routes are pressurized and smoke dampers are used. In Korea, the automatic pressure smoke damper (APSD) was recently adopted in escape routes, and the number of APSDs is increasing concomitantly with the increase in the number of high-rise buildings. In this study, a more efficient method for the assessment of the flow rates of APSD was experimentally studied for multi-blade types of which the blade angle is controlled. A modified wind tunnel was used to measure the relationship between the pressure difference and the flow rate with a blade angle variation for three kinds of APSD. As a result, the performance of the APSDs could be presented as a function of the pressure difference and blade angle. Using this performance function, a volume of information regarding the characteristics of the APSDs could be easily extracted. Furthermore, some experimental methods, based on the performance of the APSD, were suggested to assess the smoke suppression velocity and the effective leakage area in practical buildings.
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Wenling Chen,Yong Jiang,Rong Qiu,Wu Xu,Yanbei Hou 한국고분자학회 2020 Macromolecular Research Vol.28 No.1
Dense smoke released during the combustion of polystyrene (PS) potentially limits its applications in some fields. In this study, a Zr-based metal-organic framework (UiO-66) was prepared via the solvothermal method and added to PS to suppress its smoke emission. Well-defined UiO-66 particles showed an excellent dispersion state and good compatibility in the PS matrix. The introduction of UiO-66 improved the flame retardancy and smoke suppression of PS. The peak heat-release rate and total heat release were reduced by 26.8% and 14.7%, respectively, for PS/ UiO-66-5 wt%. Moreover, the smoke emissions of PS composites were evidently suppressed, and more than a 35% reduction in total smoke production was obtained with 5-wt% UiO-66. Through the analysis of the residues and pyrolysis products of PS composites, the mechanisms of enhanced flame retardancy and smoke suppression can being speculated as the promoted char-forming and heat barrier of UiO-66. This work offers a significant reference for the further study of UiO-66 and polymer materials.
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Eco-Friendly, Thermal Resistant Cotton Fabric Enhanced with Nano Zinc Borate Powder
Yeliz İpek 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
The easy burning of cotton fabrics, which have the widest usage area among natural fibers, is a serious problem. Thus, treatment with an environmental friend flame retardant material is essential for cotton fabrics. Zinc borates are multifunctionalfire retardants. They can act as smoke suppressor, flame retardant and spark suppressor. Since they are non-toxicand environmental friend materials, they are ideal flame retardants for fabric treatment. In this study, nano-sized zinc borate(ZnO·3B2O3·7H2O) was synthesized and cotton fabric was treated with zinc borate powder with a novel method. Zinc boratesare slightly soluble in water. They were dissolved with aid of ammonia as zinc ammonia borate complexes and wererecrystalised on the cotton fabric fibers through the evaporation of ammonia. The burning resistance of treated cotton fabricwas investigated. The hardness, hydrophobicity, smoke suppression and burning resistance of untreated and treated cottonfabrics were compared. Since zinc borates have smoke suppression feature, a more slight smoke was observed and a higherrate of carbonization occurred during combustion test of treated cotton fabric compared to the untreated cotton fabric. Inaddition, the burning rate was reduced from 2.26 cm/s to 1.26 cm/s.
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Zhenzeng Wu,Tingjie Chen,John Tosin Aladejana,Yves Kouomo Guelifack,Dehong Li,Xinjun Hou,Xiaodong (Alice) Wang,Min Niu,Yongqun Xie 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.98 No.-
Fire safety issues have attracted much attention since they cause enormous loss of lives and properties. Inthis study, the sustainable aluminophosphate (AP) adhesive is developed as afire retardant for improvingthefire performance of medium-densityfiberboard (MDF). The properties of AP adhesive and AP-basedMDF were evaluated based on a scanning electron microscope, thermogravimetric analysis, X-raydiffraction, X-ray photoelectron spectroscopy, and cone calorimetry. The thermostability andfireperformance of MDF are significantly improved by the deposition of the AP inorganic layer on the woodfibers surface, which could protect woodfibers from further oxidation and take away part of the heat. Compared to control sample (UF sample), the pkHRR (151.7 kW m 2), THR (66.0 MJ m 2), TTI (21 s), andmean EHC (14.6 MJ kg 1) of AP-based MDF was reduced by 52.7%, 39.0%, 41.7%, and 32.8%, respectively. Also, the existence of the AP inorganic layer is beneficial to netting the solid phase and volatileflammablecomponents in char residue of MDF, resulting in large mass loss rate, off-gases (CO and CO2) release andsmoke suppression properties. Therefore, AP could improve thefire performance of MDF.
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