| Abstract: | Based on the CFAST model, this paper describes a two-layer zone model developed to predict the environment in a multi-compartment structure subjected to a fire. The predictive equations, fire sub-processes and algorithm are concisely described. In order to validate the model and program a series of experimental data obtained from Cooper's work at NIST were selected for comparison with numerical results, and the comparison is fundamentally favourable. This paper presents an example of this comparison, including the results simulated by the CFAST zone model (Version 1.6). It is shown from the comparison that this model predicts better results than that of the CFAST for these cases, and convection heat transfer may be underestimated in the two models. It is also shown that C.W. Gear's stiffly stable method is feasible in numerically integrating the governing equation set. Additionally, this model is applied to conduct a parameter sensitivity analysis for a two-room fire, and some informative results are given and discussed. |
