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User's Guide for the Fire Demand Model: A Physically Based Computer Simulation of the Suppression of Post-Flashover Compartment Fires.


pdf icon User's Guide for the Fire Demand Model: A Physically Based Computer Simulation of the Suppression of Post-Flashover Compartment Fires. (1253 K)
Pietrzak, L. M.; Dale, J. J.

NIST GCR 92-612; MRC-R-1364; 79 p.

Sponsor:

National Institute of Standards and Technology, Gaithersburg, MD

Available from:

National Technical Information Service (NTIS), Technology Administration, U.S. Department of Commerce, Springfield, VA 22161.
Telephone: 1-800-553-6847 or 703-605-6000;
Fax: 703-605-6900.
Website: http://www.ntis.gov
Order number: PB92-222736

Keywords:

compartment fires; computer models; char; charring; drop sizes; droplets; extinguishment; flow rate; fire suppression; water sprays; smothering

Abstract:

The Swedish Fire Research Board and the U. S. Federal Emergency Management Agency, with the cooperation of the U. S. National Institute of Science and Technology, supported the development of a computerized Fire Demand Model (FDM). The FDM simulates the suppression of post-flashover charring and non-charring solid fuel fires in compartments using water sprays from portable hose-nozzle equipment used by fire departments. The output of the FDM shows the extinguishing effects of water sprays at various flow rates and droplet sizes. The calculations are based on a heat and mass balance accounting for gas and surface cooling, steam-induced smothering, direct extinguishment of the fuel and water spray induced air inflow and venting of heat and products of combustion. This document provides instruction on how to execute the FDM on a Personal Computer (PC). This includes a description of the required input parameters and instructions for producing three different types of graphical plots: (1) time-temperature histories, (2) volume-median-drop-size verses water application rate defining combinations where fire control is and is not possible, and (3) cross plots to facilitate comparison between different cases.