Development of the Fire Monitoring System

• Main Authors: Sheng-Tse Chen, 陳聖澤
• Other Authors: Yet-Pole I
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/09350410765932895512

碩士 === 國立雲林科技大學 === 環境與安全衛生工程系 === 103 === The purpose of this study is to use different software and hardware, such as LabVIEW, Arduino microcontroller, MAX6675 temperature-sensing module, and photosensitive resistors, to design a Fire’s Integrated Reduce-model Experimental System (FIRES) in order to apply its central control function on a reduced model. Different strategies and methods are implimented to prevent smoke from entering the stair staircases. FDS was applied to design the ignition source and the subsequent numerical simulation for smoke dispersion and finally to compare with the actual experimental results. The study shows the small-scale simulation using the liquid fuel of the FDS is similar to the experimental data. The full-scale simulation is very high similar to the small-scale result in the beginning; however, the former’s fuel fully burnt out within a short period according to the curve of the heat release rate. The difference between these two models become larger because the full-scale model produced greater amount of smoke at the mid-term. Cases 1-3 represent the employment of a sandwich pressurizing method, setting the intake and exhaust airflow values according to the regulations, and setting the general blocking doors/fire doors or not respecitivly. There is a good smoke barrier effect in Case 1; while in Case 2 the heat release rate decreased slightly and the total burning time increased. Case3 blocks the external oxygen supply and its burning time is quite short since oxygen supply is limited in a confined space; therefore, we must carefully consider the design and using general blocking doors/fire doors in the hallway. Cases 4 and 5 apply a single- and multi-point staircase pressurization system to simulate smoke-barrier effect and get good test results; however, the fan turbulence effect causes differences between simulations and experiments. Cases 6-8 use positive and negative pressure exhaust system and three cases all show smoke partially enter the staircases. Cases 9 and 10 employ general door barrier and whether or not exhaust fan for designing the scenarios. The results show the exhaust fan can supply oxygen into the combustion area and prolong the fire burning time. Case11 install an airflow rectifying fan/hood to amendment the drawback of Case 4 and the experimental smoke dispersion patterns are consistent with the simulated results. We expect this study can give the relevant researchers a fire prevention and smoke exhaust reference for designing the buildings in the future.