Irreversibility in energy processes: Non-dimensional quantification and balance

Abstract The concept of thermodynamic efficiency (ratio of real cycle efficiency by Carnot efficiency) is well-known. The concept of numbers of entropy-production and of exergy-loss proposed by A. Bejan are also known, but rarely used. The present study firstly evidences that these two last numbers are actually identical, thus being a common number of irreversibility, independent of the method used for obtaining it. The study also evidences a non-dimensional irreversibility balance that applies to any energy conversion process. This balance correlates the thermodynamic efficiency of a whole process (which in most cases equals the exergetic efficiency) and the numbers of irreversibility of the different components or sub-processes involved in this process. Moreover, the basic additivity of entropy-productions and exergy-losses is maintained in this balance. This balance applies to the basic cycles (heat-engines, refrigerators, heat-pumps and heat-transformers), either work- or heat-powered. It also applies to more complex cycles (heat-powered cycles consuming electricity, four-temperature heat-powered cycles, cogeneration processes), thus giving a robust framework for analyzing these cycles.

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

[2]  M. Šilhavý,et al.  On Thermodynamics of Non-Equilibrium Processes , 1982 .

[3]  A. Bejan,et al.  Entropy Generation Through Heat and Fluid Flow , 1983 .

[4]  Colin West,et al.  Principles and Applications Of Stirling Engines , 1986 .

[5]  Gregory W. Swift,et al.  Analysis and performance of a large thermoacoustic engine , 1992 .

[6]  Allan J. Organ,et al.  Thermodynamics and Gas Dynamics of the Stirling Cycle Machine , 1992 .

[7]  J. S. Spevack,et al.  Heat Conversion Systems , 1993 .

[8]  M. Pons,et al.  Second Law Analysis of Adsorption Cycles With Thermal Regeneration , 1996 .

[9]  Reinhard Radermacher,et al.  Absorption Chillers and Heat Pumps , 1996 .

[10]  Lingen Chen,et al.  Finite Time Thermodynamic Optimization or Entropy Generation Minimization of Energy Systems , 1999 .

[11]  Bernard Spinner,et al.  Thermodynamic based comparison of sorption systems for cooling and heat pumping , 1999 .

[12]  G. Swift,et al.  A thermoacoustic Stirling heat engine , 1999, Nature.

[13]  Jalel Labidi,et al.  On Intrinsic Exergy Efficiency and Heat Pumps , 2000 .

[14]  Akio Kodama,et al.  Entropic analysis of adsorption open cycles for air conditioning. Part 2: interpretation of experimental data , 2000 .

[15]  Akio Kodama,et al.  Entropic analysis of adsorption open cycles for air conditioning. Part 1 : first and second law analyses , 2000 .

[16]  H. Hellmann,et al.  The impact of work input to sorption cycles , 2001 .

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

[18]  Hans-Martin Dr Ing Hellmann.  Carnot-COP for sorption heat pumps working between four temperature levels , 2002 .

[19]  A Boubakri.  A new conception of an adsorptive solar-powered ice maker , 2003 .

[20]  S. D. Groot,et al.  Thermodynamics of Irreversible Processes , 2018, Principles of Thermodynamics.