Abstract. Is shown the influence of the heat transfer coefficient from the wet flue gas to the heat exchange surface on the overall heat transfer coefficient in the gas-air heat exchanger with the water vapor condensation. Experimental data are compared with calculations based on the mathematical model of the condensing heat exchanger.

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Abstract. The methods of flue gas heat recovery have been reviewed and carried out their effectiveness analysis. Revealed a theoretical limit of flue gas deep heat recovery and suggested possible ways to achieve them. The possibility of using air as a heated medium is discussed in more detail.

Abstract. The technology of flue gas heat recovery has been reviewed. The mathematical model requirements were analyzed and determined. The mathematical model of the installations, that implement this technology, was developed and described in paper. As a result, the software application that implements a mathematical model has allowed to design the different installations and can be useful to design organizations in the energy industry.

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