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Título
Solar-driven sodium thermal electrochemical converter coupled to a Brayton heat engine: Parametric optimization
Autor(es)
Materia
Solar collector
Sodium thermal electrochemical converter
Brayton heat engine
Irreversible loss
Performance characteristic
Parametric optimization
Fecha de publicación
2020
Citación
Peng, W., Gonzalez-Ayala, J., Guozhen, S., Jincan, C., Calvo Hernández, A. (2021). Solar-driven sodium thermal electrochemical converter coupled to a Brayton heat engine: Parametric optimization. Renewable Energy, 164, pp.260-271
Resumen
[EN]A novel high-efficiency device comprised of three subsystems, a solar collector, a sodium thermal
electrochemical converter, and a non-recuperative Brayton heat engine, is modeled by taking into account
the main internal and external irreversibility sources. The model extends previous works in which
the heat waste of the electrochemical converter is used as heat input in a Brayton gas turbine to study its
performance and feasibility when a solar energy input is added. The operative working temperatures of
three subsystems are determined by energy balance equations. The dependence of the efficiency and
power output of the overall system on the solar concentration ratio, the current density, the thickness of
the electrolyte, and the adiabatic pressure ratio (or temperature ratio) of the Brayton cycle is discussed in
detail. The maximum efficiencies and power output densities are calculated and the states of the
maximum efficiency-power density are determined under different given solar concentration ratios. The
parametric optimum selection criteria of a number of critical parameters of the overall system are
provided and the matching problems of the three subsystems are properly addressed. It is found that
under a solar concentration around 1350, the maximum efficiency and power output density of the
proposed hybrid system can reach, respectively, 29.6% and 1:23 105 W/m2. These values amount
approximately 32.7% and 156% compared to those of the solar-driven sodium thermal electrochemical
converter system without the bottoming Brayton cycle. The Pareto front obtained from numerical multiobjective
and multi-parametric methods endorses previous findings.
URI
ISSN
0960-1481
DOI
10.1016/j.renene.2020.09.084
Versión del editor
Colecciones
- GIOETFE. Artículos [48]