Continuous power output criteria and optimum operation strategies of an upgraded thermally regenerative electrochemical cycles system. (15th January 2019)

• Record Type: Journal Article
• Authors: Guo, Juncheng; Wang, Yuan; Gonzalez-Ayala, Julian; Roco, J.M.M.; Medina, A.; Calvo Hernández, A.
• Is Part Of: Energy conversion and management. Volume 180(2019)
• Page Start: 654
• Page End: 664
• Publication Date: 2019-01-15
• Subjects: Thermally regenerative electrochemical cycles -- Continuous power output criteria -- Optimum operation strategies -- Heat transfer irreversibility -- External heat leakage -- Performance evaluation; Direct energy conversion -- Periodicals; Energy storage -- Periodicals; Energy transfer -- Periodicals; Énergie -- Conversion directe -- Périodiques; Direct energy conversion; Periodicals; 621.3105
• DOI: 10.1016/j.enconman.2018.11.024
• Languages: English
• ISSNs: 0196-8904

Abstract

Graphical abstract: Highlights: A upgraded model of thermally regenerative electrochemical cycles system is proposed. Internal and external irreversible losses and the symmetry of cells are considered. Continuous power output criteria of the system are obtained for the first time. General performance characteristics and optimal operation regions are revealed. The upper and lower bounds of efficiency at maximum power output are discussed. Abstract: In order to utilize the low-grade thermal energy efficiently, a more realistic model of thermally regenerative electrochemical cycles system with continuous power output is proposed in which the heat transfer irreversibility, external heat leakage and non-ideal regeneration losses are taken into account. Besides, the symmetry of cells, which is necessary for a practical thermally regenerative electrochemical cycles system operated at steady state, is considered. Analytic expressions for the efficiency and power output of the system are derived. The design and operation criteria of the system for achieving continuous power output are obtained. The general performance characteristics and the optimally operating regions of several parameters are reported. The influences of the external heat leakage on the system performance and the upper and lower bounds of efficiency at maximum power output at different situations are evaluated and discussed.