| Summary: | 碩士 === 國立臺北科技大學 === 冷凍空調工程系所 === 93 === Buildings with atria or large spaces are becoming popular lately, such as Taipei 101 trade center, shopping malls, airport lobbies. Large spaces provide comfort and bright feeling. However the smoke control requirements and performance are important as they are often heavily occupied. Stack effects are prominent in an atrium fire; smoke plume will rise and may spread quickly to other parts of the building and cause danger to people inside the building. The present fire safety code does not provide for an atrium fire. Therefore, computer analysis and field experiments are often need to evaluate the fire safety design on performance basis. This study uses computer modeling method to analyze parameters that will affect the smoke control performance for an atrium. This study uses the computer program FDS(Fire Dynamics Simulator) as developed by NIST(National Institute of Standards and Technology). Parameters such as locations of the smoke exhaust, exhaust velocity and exhaust volume, etc are evaluated in this study. Plugholing effects are studied. A new performance index the smoke exhaust index is used for evaluation of the plugholing effects on the effective smoke exhaust volume. Measurement trees were setup in the computer model for observation of smoke distribution in a fire. It is found that improper smoke exhaust outlet location has great effects on smoke exhaust. Also, effective smoke exhaust volume is not necessarily proportional to the mechanical exhaust volume. Performance curves for various cases are provided for reference in actual design.
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