Optimal performance of an endoreversible three-mass-reservoir chemical pump with diffusive mass transfer law
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Optimal performance of an endoreversible three-mass-reservoir chemical pump with diffusive mass transfer law


Abstract
The performance of an isothermal endoreversible three-mass-reservoir chemical pump, in which the mass transfer obeys diffusive law, is analyzed and optimized in this paper. The relation between the coefficient of performance and the rate of energy pumping of the isothermal chemical pump is derived by using finite-time thermodynamics. Moreover, the optimal operating regions and the influences of some parameters on the performance of the cycle are studied. The results obtained herein can provide some new theoretical guidelines for the optimal design of a class of apparatus such as mass exchangers, and electrochemical, photochemical, and solid-state devices, as well as fuel pumps for solar-energy conversion systems.
1. Introduction
In the recent years, finite-time thermodynamics was applied to the performance study of various thermodynamic cycles and devices. It has also been extended to the cyclic devices driven by mass flow, such as chemical reactions and chemical engines, by many researchers. Heat engines generate work from differences in temperature. Similarly, chemical engines generate work from differences in chemical potentials. Chemical potential and mass transfer in chemical engines play roles analogous to temperature and heat current in heat engines. De Vos investigated the performance of solar cells, chemical reactions and solar energy conversion processes and devices. Tsirlin et al. analyzed the performance of chemical reactors. Gordon and Gordon and Orlov obtained the maximum work output and the maximum power output of a class of isothermal endoreversible chemical engines with the sole irreversibility of mass transfer. Chen et al. derived the optimal relation between the power output and the second law efficiency of the isothermal endoreversible chemical engines with the sole irreversibility of mass transfer and analyzed the effect of mass leakage on the performance of isothermal chemical engines. Chen et al.  Established a new model of a class of combined-cycle isothermal endoreversible chemical engines, derived the optimal relation between the power output and the second law efficiency of the combined-cycle isothermal endoreversible chemical engines with the sole irreversibility of mass transfer, and analyzed the effect of mass leakage on the performance of combined-cycle isothermal chemical engines. Lin et al. establ