Abstract
This work examines endoreversible combined cycle based on finite time thermodynamic concepts. In this study, the proposed system is cascade combined cycle have three heat sources. Effects of irreversibility due to the heat transfer at the system boundaries are considered. The study is based on Stephen Boltzmann's heat transfer laws. Based on finite size, this research analyzes the system based on first and second law thermodynamics. Dimensionless power, efficiency, and entropy generation are calculated based on the dimensionless variables. Dimensionless variables are primary and secondary temperature ratios, common temperature ratio, and the ratio of thermal conductance of each heat exchanger. The effects of dimensionless variables on thermodynamic criteria are examined. Also, optimization is performed base on different criteria such as dimensionless power, energy efficiency and entropy generation by genetic algorithm. The optimization results show that the maximum dimensionless power, the maximum energy efficiency and minimum entropy generation are 0.035092393, 61.09% and 8.132 E-07, respectively. The results of this study are very close to the actual results. New thermodynamic criteria bring systems closer to better conditions. Furthermore, the heat transfer mechanism and heat transfer law greatly affect performance and thermodynamic criteria another. These results are used in the design of radiant heat exchangers.
Highlights
Classical thermodynamics is a physical theory that deals with the general characteristics and behavior of macroscopic systems based on four basic laws and some specific concepts
Classical thermodynamics is generally relies on concepts and types of conversion of microscopic energy into macroscopic energy based on equilibrium
Sahin and Kodal [15] have studied endoreversible combined cycle at steady state based on finite time thermodynamics, they demonstrated the irreversibility at the highest possible power by means of two parameters corresponding to entropy difference ratio
Summary
Classical thermodynamics is a physical theory that deals with the general characteristics and behavior of macroscopic systems based on four basic laws and some specific concepts. Sahin and Kodal [15] have studied endoreversible combined cycle at steady state based on finite time thermodynamics, they demonstrated the irreversibility at the highest possible power by means of two parameters corresponding to entropy difference ratio. They studied the effects of these two irreversibility parameters in terms of thermal efficiency and power and showed that the maximum power of irreversible combined Carnot cycle cannot exceed that of endoreversible cycle in same temperature range. Ghasemkhani et al [16,17,18,19,20] evaluated the irreversible combined cycle by assuming the same heat exchangers, and their optimization results showed that the maximum dimensionless total power and thermal efficiency associated with it are 0.086102 and 47.81%, respectively
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