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In this study, exergetic sustainability index is applied to quantum irreversible Otto cycle with -1/2 spin system. Exergetic sustainability index in a quantum engine is used first time. This index is the ratio of exergy output (work output for a thermal engine) to total exergetic losses. It gives an opportunity to evaluate for all thermodynamic losses in the system, that is why, it is an important index. In addition, some thermodynamic parameters (work output, exergy destruction, first and second law efficiencies) are considered and their relationships between the exergetic sustainability index are determined. [ABSTRACT FROM AUTHOR]

Purpose of this study is to analyze a nano scale thermo-acoustic refrigeration cycle in terms of its thermodynamic performance. A nano scale thermo-acoustic refrigerator operating with Maxwell–Boltzmann gas and He 4 is chosen as the working fluid is considered. Thermo-size effects that are dominant at the nano scale are taken into account too. In addition, a new thermo environmental method identified as modified ecological function for the refrigeration cycles is proposed. Considered system are analyzed with this new proposed method as well as basic thermodynamic criteria including COP, cooling load, work input and entropy generation. Results are obtained numerically and presented. [ABSTRACT FROM AUTHOR]