INFLUENCE OF THERMODYNAMIC CRITERIA ON THE MOVEMENT REGIME OF A GAS-LIQUID MIXTURE

Abstract

The method of thermodynamic analysis allows us to evaluate the irreversible losses in the processes occurring in heat exchangers and their impact on the energy efficiency of the system. The method is based on the calculation of entropy changes during actual processes and their impact on the state of the entire energy conversion system. The thermodynamic analysis of a cycle provides a foundation for improving capacitors and conducting their thermodynamic and thermoeconomic analysis. Thermodynamic analysis of cycles is known as the "cycle method" and involves the formation of a valid cycle and the corresponding circuit design of a future system or device by gradually reducing the energy efficiency of an ideal cycle and increasing irreversibilities to achieve real-world operating conditions for each element within the system. In recent decades, this method has been largely replaced by the method of characteristic functions, which is more convenient for solving many problems and performing thermal engineering calculations, but it has not lost its significance in the field of technical thermodynamics. This is primarily due to the convenience, clarity, and logicality of its application for analyzing the efficiency of actual thermodynamic cycles in energy conversion systems. The entropy-cycle method is used for the thermodynamic analysis of the refrigeration cycle. Such studies determine the external and internal irreversibilities in condensation and boiling processes, taking into account the design features of heat exchange devices, and provide a quantitative assessment of the impact of losses on the energy efficiency of the cycle. Thus, the entropy-cycle model makes it possible to comprehensively assess the operation of a heat exchanger as part of an energy conversion system, identify key sources of losses, and determine ways to improve efficiency.

Subject: heat and mass transfer processes in finned heat exchangers and coupled circuits of a combined tri-generation plant.

Materials and methods: mathematical methods of physical and numerical modeling.

Results: the study determined the amount of energy loss in the condenser due to heat transfer at a finite temperature difference.

Conclusions: during the condensation of moving steam, there is a loss of pressure, which is quite noticeable inside the pipes and channels, as well as internal irreversibility associated with the loss of pressure by the flow of the working substance moving in the apparatus.