2017
Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/28160
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Документ Advanced thermodynamic analysis on exergy flow grafs(NTU "KhPI", 2017) Nikulshin, Vladimir; Denysova, Alla; Denysova, AnastasiiaIn the paper has been proposed f general approach for thermodynamic analysis of systems with arbitrary structures. Method was based on construction and analysis of a new type of exergy- topological model – exergy flow graph and allowed to improve the efficiency of energy intensive systems. The efficiency improving is very important problem and the main way of it solving was through thermodynamic analysis and optimization. It was shown that the processes taking place in the complex energy intensive systems were characterized by mutual transformation of quality different power resources. It has been found that one of the most effective mathematical methods used for exergetic analysis and optimization was the method the method of graph theory. The benefit of graph models can also be demonstrated by its flexibility and vide varieties of possible applications. It has been demonstrated the application of suggested approach for thermodynamic analysis of gas-turbine installation. It has been found that the degree of thermodynamic perfection of turbines and turbocompressors are sufficiently high. Usually, the bigger was the difference between average parameters of the working fluid and the environment, the smaller was the exergy losses. The same situation was also true for heat exchangers. High temperature level in regenerative refrigerator, as compared with intermediate refrigerator, give a higher degree of thermodynamic perfection of the heat exchanger. Exergy losses in other elements of the system were caused by dissipation of the flow transport in the pipelines or by mechanical losses. It has been found that for the system as a whole the degree of thermodynamic perfection was less than the same characteristics for any element of the system in result of the mutual influence of the element on the other in the system.