| Abstract | This report describes a two-zone model developed at the National Research Council of Canada (NRC) to predict fire growth and smoke production and movement in a multi-compartment building. The development of this model is primarily intended to help evaluate the risk from fires in buildings. This report describes the theoretical physical models, numerical methods, and also presents some verification examples.The report describes the derivation of the whole set of the governing ordinary differential equations (ODE). The selected independent governing variables for each compartment are pressure, enthalpy of upper layer, and mass of upper and lower layers. The implemented fire physical sub-models are described; including combustion and chemistry model, fluid flow model and heat transfer model. The combustion and chemistry model includes the calculation of heat release rate and species production and consumption rates, while the fluid flow model includes the calculation of plume entrainment, door/window type vent flow, ceiling vent flow, mechanical ventilation, stair shaft flow, and species transport. The heat transfer model includes the calculation of heat conduction, heat convection, ceiling jet-induced heat convection, and radiation heat transfer. |
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