Control and use of stack effect from the view of natural ventilation and fire safety

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For the purpose of energy conservation and requirements for improving indoor air quality, buildings employing natural ventilation are increasing recently, among which the planning of utilizing atria or vertical shafts to promote stack ventilation is not scarce. In conventional researches, 'Sterile tube' solution has frequently been used, but due to the many restrictions on the atrium design and the use of the building/atrium, it is always not favored by designers. As for the other solutions, such as using a great number of shutters to separate adjacent spaces from the atrium, besides high initial cost, it is difficult to ensure that all shutters work properly, because they are only used in case of emergency and if only one of those shutters fails to close, evacuation behavior may be delayed or fail. Proper smoke control method is urgent to be found out. In this thesis, the possibility of using the same system both for natural ventilation and smoke control is examined.To secure fire safety of a building with natural ventilation planning, a new smoke control method is proposed in this research. As the prototype building, the space of the solar chimney can be used to promote natural ventilation by absorbing solar radiation, and at the same time making the neutral plane stay in the chimney, smoke prevention can be realized by pressure difference. This concept is confirmed by reduced scale model experiments and CFD calculation.