Discussion on the applicability of entropy generation minimization to the analyses and optimizations of thermodynamic processes

Abstract This work reports the analyses of some thermodynamic systems with the concepts of entropy generation, entropy generation numbers and revised entropy generation number, as well as exergy destruction number and exergy-work conversion efficiency that are proposed in this paper. The applicability of entropy generation minimization (EGM) is conditional if the optimization objective is the output power. The EGM leads to the maximum output power when the net exergy flow rate into the system is fixed, but it may not be appropriate if the net exergy flow rate into the system is not fixed. On the other hand, smaller exergy destruction number always corresponds to larger exergy-work conversion efficiency. The refrigeration cycle with the reverse Carnot engine is also analyzed in which mechanical work is input. The result shows that the EGM leads to the largest COP if the temperature of the high temperature heat source is fixed.

[1]  D. T. Reindl,et al.  The Relationship of Optimum Heat Exchanger Allocation and Minimum Entropy Generation Rate for Refrigeration Cycles , 1998 .

[2]  A. Bejan.  Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes , 1996 .

[3]  S. Ray,et al.  Performance optimisation of laminar fully developed flow through square ducts with rounded corners , 2011 .

[4]  XueTao Cheng,et al.  Entransy flux of thermal radiation and its application to enclosures with opaque surfaces , 2011 .

[5]  Ramesh K. Shah,et al.  Entropy generation extrema and their relationship with heat exchanger effectiveness: Number of transfer unit behavior for complex flow arrangements , 2004 .

[6]  XinGang Liang,et al.  Heat-work conversion optimization of one-stream heat exchanger networks , 2012 .

[7]  Enrico Sciubba,et al.  Application of the entropy generation minimization method to a solar heat exchanger: A pseudo-optimization design process based on the analysis of the local entropy generation maps , 2013 .

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

[9]  F. Gutiérrez,et al.  Entropy generation minimization for the thermal decomposition of methane gas in hydrogen using genetic algorithms , 2012 .

[10]  Kyaw Thu,et al.  A second law analysis and entropy generation minimization of an absorption chiller , 2011 .

[11]  A. Bejan.  Advanced Engineering Thermodynamics , 1988 .

[12]  Ronan K. McGovern,et al.  Entropy Generation Analysis of Desalination Technologies , 2011, Entropy.

[13]  Yasin Ust,et al.  The Effects of Cycle Temperature and Cycle Pressure Ratios on the Performance of an Irreversible Otto Cycle , 2011 .

[14]  Xiaodong Qian,et al.  Analysis of entransy dissipation in heat exchangers , 2011 .

[15]  XinGang Liang,et al.  Optimization principles for two-stream heat exchangers and two-stream heat exchanger networks , 2012 .

[16]  A. Lai,et al.  Thermodynamic optimization of ground heat exchangers with single U-tube by entropy generation minimization method , 2013 .

[17]  J. E. Hesselgreaves.  Rationalisation of second law analysis of heat exchangers , 2000 .

[18]  Karl Heinz Hoffmann,et al.  What Conditions Make Minimum Entropy Production Equivalent to Maximum Power Production? , 2001 .

[19]  Ibrahim Dincer,et al.  Exergo-environmental analysis of an integrated organic Rankine cycle for trigeneration , 2012 .

[20]  Z. M. Xu,et al.  A modified entropy generation number for heat exchangers , 1996 .

[21]  Ibrahim Dincer,et al.  Cost and Entropy Generation Minimization of a Cross-Flow Plate Fin Heat Exchanger Using Multi-Objective Genetic Algorithm , 2011 .

[22]  Pouria Ahmadi,et al.  Modeling and thermo-economic optimization of heat recovery heat exchangers using a multimodal genetic algorithm , 2012 .

[23]  Xingang Liang,et al.  Computation of effectiveness of two-stream heat exchanger networks based on concepts of entropy generation, entransy dissipation and entransy-dissipation-based thermal resistance , 2012 .

[24]  XinGang Liang,et al.  Entransy loss in thermodynamic processes and its application , 2012 .

[25]  Ujjwal K. Saha,et al.  Thermodynamic analysis of a variable compression ratio diesel engine running with palm oil methyl ester. , 2013 .

[26]  Michael J. Moran,et al.  Availability analysis: A guide to efficient energy use , 1982 .