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ARTICLE:
N. Zhu
The Hong Kong Polytechnic University, Hong Kong N. K. Fong
The Hong Kong Polytechnic University, Hong Kong W. K. Chow
The Hong Kong Polytechnic University, Hong Kong, China
ABSTRACT In evaluating the performance of water mist fire suppression systems, extinguishing time is identified to be the key factor. Correlation relations of extinguishing time with heat release rate were derived in this paper. Results from twelve sets of full-scale tests reported in the literature were reviewed. High, intermediate and low pressure systems were considered.
Correlations for high and low pressure systems with and without ventilation were derived. Because of data limitation for intermediate pressure system, correlation was derived only for no ventilation condition. A total of five polynomials were fitted.
It is observed that the extinguishing time is proportional to the heat release rate for liquid fires. Room air temperature after fire extinguishment increases with the heat release rate. Such correlation was derived from the best fitting with limited data available on liquid fires.
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COM-27 pages
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