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Investigation of Water Mist Performance on Firefighting in Underground Parking Lots

Motaharpour, Hossein | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 53092 (08)
  4. University: Sharif University of Technology
  5. Department: Mechanical Engineering
  6. Advisor(s): Farhanieh, Bijan; Afshin, Hossein
  7. Abstract:
  8. Fire is an undesirable phenomenon that causes human and financial losses. This in itself is a dangerous event that becomes even more dangerous in closed spaces. Car fires in underground car parks are no exception. In this research, the fire caused by burning flammable materials inside the car cabin located in a closed underground parking environment and the performance of sprinkler and water mist nozzles in controlling and extinguishing it have been investigated. Based on the broad foundations of various phenomena affecting this problem, including the separation of solid fuels under the influence of heat and oxygen, chemical reactions, radiant heat transfer and change of liquid phase to water vapor, numerical modeling of the problem has been done and the method combination Different finite volume, finite difference and discrete flow solutions have been used to solve different parts of this problem. In this study, by examining three nozzle models and their different placement conditions, a suitable option for use in underground parking lots in order to control and extinguish unwanted fires has been presented. In this study, the effect of oxygen and the size of water droplets and how they are sprayed have been considered. A noteworthy point in this study is the use of solid fuel separation modeling in fire simulation that examines the conditions under which it is possible to disperse flammable combustible gas in the material. In addition to determining the proper location and number of nozzles for extinguishing, it has been shown that reducing the size of water droplets has an effect on controlling and extinguishing fires indoors
  9. Keywords:
  10. Pyrolysis ; Fire ; Fire Extinguisher ; Water Mist Nozzles ; Sprinkler Nozzles ; Underground Parking

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