TY - JOUR
TI - Spread of smoke and heat along narrow air cavity in double-skin façade fires
AU - Chow Cheuk Lun
JN - Thermal Science
PY - 2014
VL - 18
IS - 12
SP - 405
EP - 416
PT - Article
AB - A scenario on double-skin façade fire was identified earlier for hazard  assessment. A flashover room fire occurred next to the façade, broke the  interior glass pane and spread to the façade cavity. As observed in  experiments, hot gas moved up as a vertical channel flow for narrow façade  cavity. Heat and smoke spread along the narrow air cavity of a double-skin  façade will be studied in this paper. A simple mathematical model is  developed from basic heat transfer theory for studying the vertical air  temperature profiles of the hot gas flowing along the cavity. Assuming  one-dimensional flow for hot gas moving up the façade cavity, conservation  equations on mass and enthalpy were solved. Experimental results on two  double-skin façade rigs of height 6 m and 15 m with narrow cavity depth were  used to justify the results. A total of 11 tests were carried out.  Correlation expressions between cavity air temperature and the height above  ceiling of the fire room were derived.