By Jones, Walter W.; Peacock, Richard D.; Forney, Glenn P.; Reneke, Paul A.
The modeling equations utilized in CFAST take the mathematical type of an preliminary worth challenge for a procedure of normal differential equations (ODEs). those equations are expecting as features of time amounts reminiscent of strain, layer top and temperatures given the buildup of mass and enthalpy within the layers. The CFAST version then comprises a suite of ODEs to compute the surroundings in each one compartment and a suite of algorithms to compute the mass and enthalpy resource phrases required through the ODEs. This 2009 record offers the technical documentation for CFAST in addition to major details on validation of the version. The algorithms, approaches, and laptop courses defined during this file represent a strategy for predicting the various effects caused by a prescribed fireplace. they've been compiled from the simplest wisdom and figuring out presently to be had, yet have very important barriers that needs to be understood and thought of by way of the person. this system is meant to be used through people efficient within the box of fireside security and with a few familiarity with own desktops. it truly is meant as an relief within the hearth defense decision-making procedure.
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Extra resources for CFAST - Consolidated Model of Fire Growth and Smoke Transport (Version 6) Technical Reference Guide
Sample text
G. df, included with the model. These properties come directly from handbook values for typical materials [10]. 8 Model Results The output of CFAST are the sensible variables that are needed for assessing the environment in a building subjected to a fire. Once the simulation is complete, CFAST produces an output file containing all of the solution variables. Typical outputs include (but are not limited to) the following: • environmental conditions in the room (such as hot gas layer temperature; plume centerline temperature; oxygen and smoke concentration; and ceiling, wall, and floor temperatures) • heat transfer-related outputs to walls and targets (such as incident convective, radiated, and total heat fluxes) • fire intensity and flame height • flow velocities through vents and openings • detector and sprinkler activation times There is more extensive discussion of the output in chapter 6 of this technical reference manual and the users guide.
8 Model Results The output of CFAST are the sensible variables that are needed for assessing the environment in a building subjected to a fire. Once the simulation is complete, CFAST produces an output file containing all of the solution variables. Typical outputs include (but are not limited to) the following: • environmental conditions in the room (such as hot gas layer temperature; plume centerline temperature; oxygen and smoke concentration; and ceiling, wall, and floor temperatures) • heat transfer-related outputs to walls and targets (such as incident convective, radiated, and total heat fluxes) • fire intensity and flame height • flow velocities through vents and openings • detector and sprinkler activation times There is more extensive discussion of the output in chapter 6 of this technical reference manual and the users guide.
In CFAST all compartments have two zones except for the fire room which has an additional zone for the plume. Since a real upper/lower interface is not as sharp as this, one has a spatial error of about 10 % in determining the height of the layer [13, 14]. The zone model concept best applies for an enclosure in which the width and length are not too different. , the room looks like a corridor), the flow pattern in the room may become asymmetrical. If the enclosure is too shallow, the temperature may have significant radial differences.
