COMPARATIVE ANALYSIS OF COMPLEX METHODS OF STADY OF THE HEAT RECOVERY SYSTEMS EFFICIENCY

The paper presents the results of a study of the efficiency of a heat recovery included in the recovery system of exhaust gas heat of a heat engine of a cogeneration unit. The studies were carried out using complex methods based on the following methods: a method using dissipative functions and a balance method of exergy analysis. The results of the calculation of dissipative functions, exergy losses and exergy criteria performed within the framework of the indicated methods for each of the eight heat recovery unit modules are presented. The analysis allows us to identify the heat recovery modules that need optimization or structural development. Particular attention is paid to a comparative analysis of the selected methods and consideration of the advantages and disadvantages of their use in various cases. It is noted that the methodology based on the integrated balance method of exergy analysis can be considered effective due to the small number of initial parameters necessary for calculation, as well as the simplicity of calculation and analytical methods to obtain exergy characteristics. The advantage of a technique that uses the concept of dissipative functions can be considered that it allows us to separate the exergy losses in the heat recovery associated with nonequilibrium heat transfer and the movement of coolants.