DEVELOPMENT OF METHODS FOR CALCULATING EXERGETIC LOSSES IN AIR-HEATING OF HEAT UTILIZATION SYSTEMS OF BOILER PLANTS

A reasoned choice of the method of researching the exergetic efficiency of the heat recovery equipment of power plants allows optimizing the heat recovery parameters responsible for the equipment's efficiency. The results of the development of a complex methodology for calculating exergy losses in plate and smooth-tube air-heated heat exchangers of boiler plants are presented. Exergetic losses are used as a criterion of exergetic efficiency of heat exchangers. The methodology is based on systems of integral equations of functional analysis and differential equations of heat transfer theory. Formulas for calculating exergy losses in flat and cylindrical walls of heat exchangers are obtained. The processes of heat conduction, heat transfer from flue gases to the wall and heat transfer from the wall to the air are considered. The developed technique makes it possible to ensure the necessary reduction of losses of a certain type in order to increase the exergetic efficiency of heat utilization systems of boiler plants.