Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Bejan, Adrian

doi:10.1063/1.362674

Cited by 1,667 publications

(666 citation statements)

References 198 publications

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“…Among these, for instance, are Prigogine's principle of minimum entropy production (Prigogine 1955;Bejan 1996), maximum entropy production ( This issue deals with one of the proposed principles, the principle of MEP. The MEP principle states that non-equilibrium thermodynamic systems are organized in steady state such that the rate of entropy production is maximized.…”

Section: Thermodynamics and Environmental And Ecological Systemsmentioning

confidence: 99%

“…Many extensions related to the second law of thermodynamics and new thermodynamic laws have been proposed to explain systems far from a state of thermodynamic equilibrium. Among these, for instance, are Prigogine's principle of minimum entropy production (Prigogine 1955;Bejan 1996), maximum entropy production (MEP)-as a separate 'law' (Swenson 1997) or as an extension of the second law to non-equilibrium systems (Dewar 2003)-maximum power (Lotka 1922a,b;Odum 1988) or exergy (Jorgensen & Svirezhev 2004), depletion of gradients (Schneider & Sagan 2005) and a proposed constructal law (Bejan & Lorente 2006). Many of these hypotheses have in common that at least in part they have been motivated by thermodynamics, specifically the second law of thermodynamics.…”

Section: Thermodynamics and Environmental And Ecological Systemsmentioning

confidence: 99%

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Maximum entropy production in environmental and ecological systems

Kleidon

Malhi

Cox

2010

Phil. Trans. R. Soc. B

151

107

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The coupled biosphere -atmosphere system entails a vast range of processes at different scales, from ecosystem exchange fluxes of energy, water and carbon to the processes that drive global biogeochemical cycles, atmospheric composition and, ultimately, the planetary energy balance. These processes are generally complex with numerous interactions and feedbacks, and they are irreversible in their nature, thereby producing entropy. The proposed principle of maximum entropy production (MEP), based on statistical mechanics and information theory, states that thermodynamic processes far from thermodynamic equilibrium will adapt to steady states at which they dissipate energy and produce entropy at the maximum possible rate. This issue focuses on the latest development of applications of MEP to the biosphere -atmosphere system including aspects of the atmospheric circulation, the role of clouds, hydrology, vegetation effects, ecosystem exchange of energy and mass, biogeochemical interactions and the Gaia hypothesis. The examples shown in this special issue demonstrate the potential of MEP to contribute to improved understanding and modelling of the biosphere and the wider Earth system, and also explore limitations and constraints to the application of the MEP principle.Keywords: thermodynamics; interactions; Earth system science; ecosystems THERMODYNAMICS AND ENVIRONMENTAL AND ECOLOGICAL SYSTEMSThermodynamics has long been recognized as critical for understanding complex systems ranging from the living cell to planet Earth (Boltzmann 1886;Schrö dinger 1944;Lovelock 1965). Boltzmann already noted in 1886 that:. . . the general struggle for existence of animate beings is not a struggle for raw materials-these, for organisms, are air, water and soil, all abundantly available, nor for energy which exists in plenty in any body in the form of heat, but a struggle for entropy, which becomes available through the transition of energy from the hot sun to the cold Earth.Schrö dinger (1944) extended this perspective in his seminal book What is life? in which he suggested that the living cell maintains its organized structure in a state of thermodynamic disequilibrium by depleting sources of free energy and exporting high entropy waste. At the planetary scale, Lovelock (1965) recognized that the Earth's atmospheric composition is maintained in a state far from thermodynamic equilibrium, and he attributed this unique thermodynamic state to the profound effect that life has on its environment.Taken together, these examples suggest that in order to better understand Earth's environmental and ecological systems and their couplings, we need to view these as coupled thermodynamic systems that are organized in a state far from thermodynamic equilibrium. Central to thermodynamics is the concept of 'entropy' as a measure of 'disorder' or 'randomness'. While the use of 'entropy' is often surrounded with ambiguity, it can nevertheless be used in purely quantitative terms to measure the distance of a given state from thermodynamic equilibriu...

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Section: Thermodynamics and Environmental And Ecological Systemsmentioning

confidence: 99%

Section: Thermodynamics and Environmental And Ecological Systemsmentioning

confidence: 99%

Maximum entropy production in environmental and ecological systems

Kleidon

Malhi

Cox

2010

Phil. Trans. R. Soc. B

151

107

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“…Later the results of [90,91] were extended and generalized for other criteria and for more complex situations based on the modern optimal control theory. As a result, the whole direction in thermodynamics arose known under the names optimization thermodynamics, finite-time thermodynamics or control thermodynamics, see monographs and surveys [92][93][94][95][96]. The state of the art in finite-time thermodynamics is exposed by Stanislaw Sienyuticz & Anatoly Tsyrlin [97].…”

Section: Cybernetics and Thermodynamicsmentioning

confidence: 99%

Horizons of cybernetical physics

Fradkov

2017

Phil. Trans. R. Soc. A.

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The subject and main areas of a new research field—cybernetical physics—are discussed. A brief history of cybernetical physics is outlined. The main areas of activity in cybernetical physics are briefly surveyed, such as control of oscillatory and chaotic behaviour, control of resonance and synchronization, control in thermodynamics, control of distributed systems and networks, quantum control. This article is part of the themed issue ‘Horizons of cybernetical physics’.

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“…Since the mid 1970s, finite-time thermodynamics [1][2][3][4][5][6][7][8][9][10] has been applied to optimize the performance of various thermodynamic systems and processes. Heat exchanger is used in modern industry widely.…”

Section: Introductionmentioning

confidence: 99%

Optimal paths for minimizing lost available work during heat transfer processes with a generalized heat transfer law

Shao-Jun¹,

Chen²,

Sun³

2009

Braz. J. Phys.

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A common of finite-time heat transfer processes between high-and low-temperature sides with a generalized heat transfer law [q ∝ (∆(T n )) m ] are studied in this paper. The optimal heating and cooling configurations for minimizing lost available work are derived for the fixed initial and final temperatures of the working fluid of the system (low-temperature side). Optimal paths are compared with the common strategies of constant heat flux, constant source (reservoir) temperature and the minimum entropy generation operation by numerical examples. The condition corresponding to the minimum lost available work strategy is that corresponding to a constant rate of lost available work, not only valid for Newton's heat transfer law [q ∝ ∆T ] but also valid for the generalized convective heat transfer law [q ∝ (∆T ) m ]. The obtained results are more general and can provide some theoretical guidelines for the designs and operations of practical heat exchangers.

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Entropy generation minimization: The new thermodynamics of finite-size devices and finite-time processes

Cited by 1,667 publications

References 198 publications

Maximum entropy production in environmental and ecological systems

Maximum entropy production in environmental and ecological systems

Horizons of cybernetical physics

Optimal paths for minimizing lost available work during heat transfer processes with a generalized heat transfer law

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