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Long Jet Monitor의 소화수 분사 거리에 대한 유동 해석적 연구
조재상 한국산업융합학회 2023 한국산업융합학회 논문집 Vol.26 No.5
Currently, the sprinkler method is widely used as an initial suppression method in existing firefighting systems. However, this method can cause significant damage to both equipment and facilities in the hydration area. To minimize this damage, fire extinguishing monitors are being developed that can spray fire extinguishing water directly at the point of fire. These monitors are installed on the top floor of the ship, such as the Living Quarter and Ventilation System. While conventional fire extinguishing monitors focus on lightweight research with a short spray port and require a spray distance of about 40 to 45m, recent developments necessitate a longer spray port, similar to a water cannon, requiring a spray distance of about 70 to 75m. This study aims to predict the injection distance of both the existing ship-installed fire extinguisher and the long spray port fire extinguisher through hydrodynamic computer analysis, and to determine whether the injection distance has increased.
조재상,장웅식,박소윤,김병기,왕동환 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.61 No.-
In this research, ligand exchanged silver nanoparticles (Ag NPs) were incorporated into perovskite by an effective method during the solvent treatment. Since PVP-capped or bare-Ag NPs tend to aggregate in organic solvents, the original capping agent was replaced by propanethiol which reduced aggregation and enhanced thermal stability, which was confirmed by Zeta-radius measurement and morphological analysis. Accordingly, Ag NPs with propanethiol improved light absorption by facilitating scattering which contributed to increased charge generation/transport with reduced recombination. The effective ligand exchange and incorporation method can be a useful approach for device stability between Ag NPs and methyl ammonium lead halide perovskite.