Under the assumption of the constant temperature, pressure, smoke concentration within each layer and by using conservation of mass, energy, components and the state equation of the ideal gas, a multi-layer zone model is introduced.

• 通过假定每个水平控制层内的物理参数(如温度、压强、烟气浓度等)为均匀分布,并运用质量守恒原理、能量守恒原理、组分守恒方程以及理想气体状态方程,建立了一个可以获得火灾发展过程中温度和浓度垂向分布的多层区域模型。