GAS EXCHANGE THROUGH THE OPEN OPENINGS OF A BUILDING 
IN THE CASE OF FIRE WITHIN IT. INTEGRAL MODEL

S. V. Puzach and V. M. Kazennov

UDC 614.841.4

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.

Academy of State Fire-Prevention Service, Moscow, Russia; 
email: puzachsv@hotmail.com. Translated from Inzhenerno-Fizicheskii 
Zhurnal, Vol. 76, No. 5, pp. 181-186, September-October, 2003. 
Original article submitted January 21, 2003.