Universal optimization efficiency and bounds of Carnot-like heat engines and refrigerators under shortcuts to isothermality

Abstract

Based on a quantum thermodynamic protocol for shortcut to isothermality that smoothly modify the system-reservoir interaction can significantly speed up an isothermal process while keeping the overall dissipation constant [Phys. Rev. X. 10, 031015 (2020)], we extend the study of optimization performance of Carnot-like heat engines and refrigerators in a straightforward and unified way. We derive the universal optimization efficiency of heat engines and the optimization coefficient of performance of refrigerators under two unified optimization criterions, i.e., chi criterion and omega criterion. We also derived the universal lower and upper bounds for heat engines and refrigerators, and found that these bounds can be reached under extremely asymmetric cases.

The main results of this preprint have been included in the published papers in a general form, i.e 1. Y. Wang and Z. C. Tu, Commun. Theor. Phys. 59, 175 (2013). 2. K. Nilavarasi and M. Ponmurugan, J. Statis. Mech.: Theory Exp. 4, 043208 (2021). 3. K. Nilavarasi and M. Ponmurugan, Physica A 590, 126700 (2022)