DISCRETE-MODULAR PRINCIPLE OF STUDY OF EFFICIENCY OF HEAT RECOVERY SYSTEMS ON THE BASIS OF THE EXERGY APPROACH

The results of the development of the discrete-modular principle of studying the efficiency of heat recovery systems based on the exergy approach are presented. The principle under consideration is focused on the development of energyefficient technological systems that meet the conditions of thermodynamic reversibility of processes in the system. Three types of representation of a heat recovery system in the form of a system of discrete modules are considered: – discrete structuring of individual elements of the heat recovery system, which allows you to highlight the individual modules of such elements in which the largest loss of energy. – structuring of the heat recovery system, i. e. its presentation in the form of a system of individual elements (modules), in which the properties of the module, which determine its material and energy interaction with other elements of the system, are taken into account. – multilevel structuring of the heat recovery system, i. e. its representation in the form of a system of separate modules (levels), as if embedded in one another and interconnected by the initial parameters of the modules. The possibilities of using the discrete-modular principle in complex techniques for analyzing the efficiency of heat recovery systems are analyzed. An example of the implementation of the first type of discrete-modular representation for surface hot-water and hot-air heat recoveries that are part of the heat recovery system of a glass melting furnace is given. The second type of discrete-modular presentation, which can be the basis for a comprehensive technique combining exergy analysis methods with structural-variant methods are considered. The essence of the method consists in establishing, using exergy calculations, and those elements in which the change in exergy most significantly affects the change in exergy of the entire heat recovery system. The third type of discrete-modular representation can be the basis for a comprehensive technique combining exergy analysis methods and multilevel optimization methods. The essence of the method is to use the optimal parameters of the internal module as the initial parameters of the external module.