Tarasenko A. Improvement of the methods of calculation and design air heaters boilers based on modeling the dynamic characteristics of heat transfer processes

The object of study - non-stationary heat transfer processes that take place in the air heaters boilers and other types of recuperative heat exchangers. Research purpose improvement methods of calculation, static and dynamic thermal characteristics of heat transfer processes, which will identify ways to improve the efficiency and reliability and to improve the design of the surface of tubular air heater industrial and power boilers. Methods: theoretical positions of the dissertation is based on the fundamentals of the theory of heat transfer. Mathematical model of heat transfer obtained on the basis of the law of conservation of energy. For the numerical analysis of heat transfer processes in the air heaters used the method of "running account". Parameters of the thermal processes were defined according to the standard method of calculation of heat boilers. To define the steady-state method was used to establish the air heater. Theoretical and practical results: a methodology for the calculation of heat transfer processes in tubular air heaters boilers and its implementation in the software package. Novelty: An improved method of "running account" on the analysis of transients in tubular heat exchangers such as "gas - gas" for the various circuits current heat transfer fluids, for the first time, the curves obtained acceleration of the flow temperature multi-port tube heat exchanger with cross-circuit current coolants, without restrictions on the nature of the change coolant temperature disturbance, improved the methods of thermal calculation of the air heater by taking account of irregularities in the inlet temperature of the coolant at the temperature state of the heat exchanger. The degree of implementation: Department TTET NTU "KPI" NTP "Ukrpromenergo", Kharkiv. Applications: industrial power.