Using Fire Dynamics Simulator to Simulate the Fire Suppression Effect of Water Mist in a Theater
| Autor: | Lin, Kan-Zhun, 林侃諄 |
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| Rok vydání: | 2019 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 107 This thesis applied Fire Dynamic Simulator (FDS) to study the fire suppression effects of sprinklers in the theater, whose ceiling and wall material is set to be PU. The water droplet sizes of the sprinkler were categorized into three types: 1000µm (traditional sprinkler), 500µm and 100µm. The last two are of water mist. The designed fire source, located in the left corner of the last row of the theater, was in an ultra-fast growth curve and it reached the maximum heat release rate of 1MW. The seat material was PU. The parameters to observe the fire suppression effects were the heat release rate, under-ceiling temperatures, and oxygen concentrations. The simulation results showed that no matter what type of water sprinkle system is activated, the heat release rate, fire spread and temperature under the ceiling are much lower than those without water spray, indicating that the acting sprinkle system can effectively mitigate the fire intensity. The traditional water-spray performance was better than that of the two water mist systems. The main reason is that the traditional sprinkle system provides much more spray water, 13.8 times of water mist ones. At the same amount of water, the peak heat release rates are the same. It is found that the resultant oxygen concentrations for the three systems show not much different, indicating that the "Oxygen Displacement" of the water mist does not demonstrate its effect in FDS. Therefore, the fire suppression effect by the Oxygen Displacement, one of the main effects of water mist could be added in FDS in the near future. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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