New exergy analysis of a regenerative closed Brayton cycle

Abstract In this study, the optimal performance of a regenerative closed Brayton cycle is sought through power maximization. Optimization is performed on the output power as the objective function using genetic algorithm. In order to take into account the time and the size constraints in current problem, the dimensionless mass-flow parameter is used. The influence of the unavoidable exergy destruction due to finite-time constraint is taken into account by developing the definition of heat exergy. Finally, the improved definitions are proposed for heat exergy, and the second law efficiency. Moreover, the new definitions will be compared with the conventional ones. For example, at a specified dimensionless mass-flow parameter, exergy overestimation in conventional definition, causes about 31% lower estimation of the second law efficiency. These results could be expected to be utilized in future solar thermal Brayton cycle assessment and optimization.

[1]  D Goran Vuckovic,et al.  AVOIDABLE AND UNAVOIDABLE EXERGY DESTRUCTION AND EXERGOECONOMIC EVALUATION OF THE THERMAL PROCESSES IN A REAL INDUSTRIAL PLANT , 2012 .

[2]  Chih Wu,et al.  Power optimization of a finite-time Carnot heat engine , 1988 .

[3]  Lingen Chen,et al.  The finite-time exergoeconomic performance of a real, intercooled, regenerated gas-turbine cogeneration plant. Part 1: model description and parametric analyses , 2014 .

[4]  M. Goodarzi,et al.  Comparative energy analysis on a new regenerative Brayton cycle , 2016 .

[5]  Michael J. Barrett,et al.  System Mass Variation and Entropy Generation in 100-kWe Closed-Brayton-Cycle Space Power Systems , 2004 .

[6]  Hasan Yamik,et al.  Limits and Optimization of Power Input or Output of Actual Thermal Cycles , 2013, Entropy.

[7]  A. Bejan.  Theory of heat transfer-irreversible power plants , 1988 .

[8]  F. Curzon,et al.  Efficiency of a Carnot engine at maximum power output , 1975 .

[9]  Peter A. Jacobs,et al.  Dynamic characteristics of a direct-heated supercritical carbon-dioxide Brayton cycle in a solar thermal power plant , 2013 .

[10]  J. M. Gordon,et al.  Observations on efficiency of heat engines operating at maximum power , 1990 .

[11]  Adrian Bejan.  Thermodynamic optimization alternatives : Minimization of physical size subject to fixed power , 1999 .

[12]  Clifford K. Ho,et al.  High-Temperature Receiver Designs for Supercritical CO2 Closed-Loop Brayton Cycles , 2014 .

[13]  Michel Feidt,et al.  Performance Optimization of a Solar-Driven Multi-Step Irreversible Brayton Cycle Based on a Multi-Objective Genetic Algorithm , 2016 .

[14]  Lingen Chen,et al.  Exergoeconomic performance analyses of an endoreversible intercooled regenerative Brayton cogeneration-type model , 2011 .

[15]  Bahri Sahin,et al.  Optimization of thermal systems based on finite-time thermodynamics and thermoeconomics , 2004 .

[16]  K R Rushton,et al.  Heat conduction with melting simulated on a resistance-capacitance network , 1970 .

[17]  Karsten Kusterer,et al.  Helium Brayton Cycles With Solar Central Receivers: Thermodynamic and Design Considerations , 2012 .

[18]  Emin Açıkkalp,et al.  Models for optimum thermo-ecological criteria of actual thermal cycles , 2013 .

[19]  John J. Dyreby,et al.  Design Considerations for Supercritical Carbon Dioxide Brayton Cycles With Recompression , 2014 .

[20]  C. W. Lewis,et al.  Fuels from biomass—energy outlay versus energy returns: A critical appraisal , 1977 .

[21]  Carlos A. Herrera,et al.  Power and entropy generation of an extended irreversible Brayton cycle: optimal parameters and performance , 2006 .

[22]  Hasan Yamık,et al.  Modeling and optimization of maximum available work for irreversible gas power cycles with temperature dependent specific heat , 2015 .

[23]  M. J. Moran,et al.  Thermal design and optimization , 1995 .

[24]  Cha'o-Kuang Chen,et al.  Power Optimization of an Irreversible Brayton Heat Engine , 1997 .

[25]  Tatiana Morosuk,et al.  Conventional and advanced exergetic analyses applied to a combined cycle power plant , 2012 .

[26]  Adrian Bejan,et al.  Theory of heat transfer-irreversible power plants. II: The optimal allocation of heat exchange equipment , 1995 .

[27]  Chih Wu,et al.  Finite-time thermodynamic analysis of a Carnot engine with internal irreversibility , 1992 .

[28]  Arif Hepbasli,et al.  Advanced exergoeconomic analysis of a trigeneration system using a diesel-gas engine , 2014 .

[29]  Yasin Ust,et al.  Optimization of a regenerative gas-turbine cogeneration system based on a new exergetic performance criterion: Exergetic performance coefficient , 2007 .

[30]  Cha'o-Kuang Chen,et al.  Power optimization of an endoreversible regenerative Brayton cycle , 1996 .

[31]  Hasan Yamık,et al.  Novel thermoenvironmental evaluation criteria and comparing them for an actual heat engine , 2015 .

[32]  Fengrui Sun,et al.  Power density analysis and optimization of a regenerated closed variable-temperature heat reservoir Brayton cycle , 2001 .

[33]  Said Farahat,et al.  Exergoeconomic multi objective optimization and sensitivity analysis of a regenerative Brayton cycle , 2016 .

[34]  George Tsatsaronis,et al.  ON AVOIDABLE AND UNAVOIDABLE EXERGY DESTRUCTIONS AND INVESTMENT COSTS IN THERMAL SYSTEMS , 2002 .

[35]  Said Farahat,et al.  Finite time exergy analysis and multi-objective ecological optimization of a regenerative Brayton cycle considering the impact of flow rate variations , 2015 .

[36]  Ibrahim Dincer,et al.  Thermodynamic and exergoenvironmental analyses, and multi-objective optimization of a gas turbine power plant , 2011 .

[37]  Fengrui Sun,et al.  Theoretical analysis of the performance of a regenerative closed Brayton cycle with internal irreversibilities , 1997 .

[38]  Yousef Haseli.  Optimization of a regenerative Brayton cycle by maximization of a newly defined second law efficiency , 2013 .

[39]  Josua P. Meyer,et al.  A review on the thermodynamic optimisation and modelling of the solar thermal Brayton cycle , 2013 .