HEAT AND MASS EXCHANGE IN DEEP COOLING OF THE PRODUCTS OF COMBUSTION OF NATURAL GASA. P. Baskakov and E. V. Il'ina UDC 620.9:662.92; 658.264 The process of deep cooling of the products of combustion of natural gas with the condensation of a steam on the heat-exchange surface has been analyzed. The dependence of the relative volume concentration of the steam on the temperature of the gases in the process of cooling has been obtained. Ural State Technical University (USTU), Ekaterinburg, Russia; email: firstname.lastname@example.org. Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 76, No. 2, pp. 88-93, March-April, 2003. Original article submitted August 21, 2002.