- Author
-
Chow, W. K.
- Title
- Better Parameter for Specifying the Requirement of Smoke Control System in Atria.
- Coporate
- Hong Kong Polytechnic Univ., Kowloon
- Book or Conf
- Safety Conference 1997. Hong Kong Engineers: Engineering for Public Safety. Organized by Safety Specialist Group, Hong Kong Institution of Engineers. Supported by Xinhua News Agency. Proceedings. April 23, 1997,
Hong Kong,
1-17 p.,
1997
- Keywords
-
atria
|
smoke control
|
fire load
|
fire models
|
smoke filling
|
time constant
|
compartments
|
fire spread
|
equations
|
smoke layers
|
zone models
- Identifiers
- Cubic: of cubic shape and the design is commonly found in Hong Kong; Flae or Linear: has a large transverse dimension in comparing with the height, usually in shopping malls; High: has a height to width (or length) ratio of more than two, mainly in prestigious office buildings
- Abstract
- Two important factors would determine whether smoke control system has to be installed in an atrium. They are the space volume of the compartment and the fire load density. The geometrical shape of the atrium is not considered. Recent fire modelling studies indicated that the smoke filling process in atria of different shapes but same volume would be very different. A time constant is proposed as a substitute to the space volume. This parameter included the geometry of the compartment and the probable fire size. Several expressions derived from different plume equations and transient variation of smoke layer interface height are reviewed and compared. Zone modelling simulations are performed to derive correlation equations between the smoke filling time and the time constant.