| Summary: | 碩士 === 國立交通大學 === 機械工程系 === 91 === This study adopts the SFPE Performance-based design procedure to evaluate the performance of upward and downward smoke exhaust systems, respectively, in a wafer fabrication area. The tools used are FDS (Fire Dynamics Simulator), Simulex and three traditional calculation methods. The peaks of design fires are 800 kW (scenario 1) and 3 MW (scenario 2). Both smoke exhaust systems in scenario 1 meet the performance criteria, whereas the downward one in scenario 2 cannot satisfied with the requirement. The performance of upward exhaust system is better. However, the downward smoke exhaust system can be still utilized, provided that some restrictions in the fire protection design, such as the materials used and the acceptable emergency plan, are fully complied. For occupant evacuation, the Simulex result shows that the total evacuation time is 191 s., which meets the requirement, 200 s., the smoke control time, which is a higher criterion than that required by the local fire code. The results of three traditional methods confirm that the evacuation time is less than the smoke layer descending time, meaning that the occupants are safe. For the fume exhaust duct fire cases, the results confirm that the PP duct with sprinklers and the stainless duct can successfully decrease fire damage and obtain a much better fire performance than these of PP duct.
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