The idea of the proposed project is to utilize the heat of flue gases with condensation of water vapor in them, while converting part of the resulting thermal energy into mechanical work of transporting the coolant. The proposed heat exchanger will significantly increase the efficiency of the boiler unit (up to 17%), as well as reduce the cost of transporting the coolant, while this device will significantly expand the capabilities of non-volatile systems, due to the fact that electric energy sources will not be required for the circulation of the coolant, that is, the heat supply system equipped with the proposed heat exchanger will retain energy independence. The transformation is proposed to be carried out by working on a closed thermodynamic cycle.
The main competitive products of this technology are heat recovery heat exchangers from various manufacturers of large boilers and furnaces, but they are designed to reduce the temperature to 120-130 degrees Celsius, the proposed technology provides a decrease in temperature to 60-70 degrees Celsius, and, accordingly, a higher efficiency of thermal energy generation. Also, condensation boilers can be counted as competitors, which provide the same parameters, but they are significantly more expensive by 5-6 times.
These indicators are achieved through the use of a unique thermodynamic cycle of the heat exchanger.

Lysiakov Anatoly Ivanovich