Abstract
Several techniques on the Second Law of Thermodynamics have been used in the past for the analysis of Air standard Cycles. The terms used for these techniques include irreversibility analysis, entropy generation minimization, exergy analysis and thermodynamic efficiency. Entransy is a recently developed concept reflecting the heat transfer potential, rather than the ability to convert heat to work. This paper extends this concept to optimize thermodynamic processes of an irreversible Atkinson cycle. The entransy balance equation of thermodynamic processes is introduced, with which the concept of entransy dissipation is developed. For the irreversible Atkinson cycle where the working fluid is heated by the streams with prescribed inlet temperatures and specific capacity flow rates, it is found that the maximum entransy dissipation leads to the maximum output work, which is the maximum principle of entransy dissipation in thermodynamic processes. At the same time, it is found that minimum entropy generation alone could not describe change of the output work for the Atkinson cycle. The operation parameters are optimized for evaluating the maximum output work of Atkinson cycle by incorporating maximum entransy dissipation and minimum entropy generation when both, entransy dissipation and entropy generation, are induced by dumping the used streams into the environment is considered.
Highlights
The Atkinson cycle is named after its inventor James Atkinson in 1882 Pulkrabek [1]
CC heat capacity flow rate (WK-1) CCPP heat capacity flow rate at constant pressure (WK-1) CCVV heat capacity flow rate at constant volume (WK-1) GGdddddd entransy dissipation not induced by environment (WK) GGdddddd,ee entransy dissipation induced by environment (WK) QQ heat transfer rate (W) SSgg entropy generation not induced by environment (WK-1)
It is found that some of the net entransy flow from the heat sources is dissipated during the heating and the cooling processes of the working fluid, while the rest is lost in the process of doing work
Summary
The Atkinson cycle is named after its inventor James Atkinson in 1882 Pulkrabek [1]. As the worldwide energy crisis is becoming more and more serious, effective energy utilization and exchange are receiving more and more attention. The operation parameters are optimized for obtaining maximum output work from an irreversible Atkinson cycle by incorporating principles of maximum entransy dissipation and minimum entropy generation γγ reversible adiabatic index Subscripts HH hot fluid iiii inlet LL cold fluid max maximum min minimum out outlet. For this purpose, Guo et al [12] introduced a new physical quantity, entransy that describes the heat transfer ability by the analogy between heat and electrical conduction. The entransy balance equations for thermodynamic processes of an irreversible Atkinson cycle are introduced and the
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