Gas Exchange Through the Open Openings of a Building in the Case of Fire within it. Integral Model

A method for calculating the parameters of natural gas exchange between a building within which there occurs combustion and the environment with regard for the inhomogeneity of the temperature distribution along the height is proposed. Analytical formulas for determining the mass flow rates of the gases, the height of the neutral plane, the mean‐mass temperature of the gases flowing outward, and the pressure distribution along the height inside the building have been obtained. A correlation between the results of the calculations of the mass flow rates of the gases flowing outward has been made using expressions obtained and assuming that the temperature is constant along the height. It is shown that the inhomogeneity of the temperature field substantially influences the critical period of combustion.