Entransy dissipation-based constraint for optimization of heat exchanger networks in thermal systems

Xu, Yun-Chao; Chen, Qun; Guo, Zeng-Yuan

doi:10.1016/j.energy.2015.04.024

Cited by 42 publications

(4 citation statements)

References 43 publications

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“…In addition, the principle can also be extended to handle thermal convection optimization problems [16]; this is because the convective heat transfer process is actually heat conduction with heat sources [34]. As for some complicated problems, such as heat exchanger networks [35][36][37], the entransy theory can be employed to simplify the constraints, and thus facilitate the optimization process. By introducing entransy dissipation-based thermal resistance [16],…”

Section: Heat Transfer Optimization On the Basis Of Entransy Dissipatmentioning

confidence: 99%

Irreversibility and Action of the Heat Conduction Process

Younan

Zhao

Guo

2018

Entropy

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Irreversibility (that is, the "one-sidedness" of time) of a physical process can be characterized by using Lyapunov functions in the modern theory of stability. In this theoretical framework, entropy and its production rate have been generally regarded as Lyapunov functions in order to measure the irreversibility of various physical processes. In fact, the Lyapunov function is not always unique. In the represent work, a rigorous proof is given that the entransy and its dissipation rate can also serve as Lyapunov functions associated with the irreversibility of the heat conduction process without the conversion between heat and work. In addition, the variation of the entransy dissipation rate can lead to Fourier's heat conduction law, while the entropy production rate cannot. This shows that the entransy dissipation rate, rather than the entropy production rate, is the unique action for the heat conduction process, and can be used to establish the finite element method for the approximate solution of heat conduction problems and the optimization of heat transfer processes.

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Section: Heat Transfer Optimization On the Basis Of Entransy Dissipatmentioning

confidence: 99%

Irreversibility and Action of the Heat Conduction Process

Younan

Zhao

Guo

2018

Entropy

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“… [3] ) discussing whether entransy has “ usefulness in the practical application in the field of heat transfer ”. In fact, both third-party researchers and we have published replies and counterarguments corresponding to these references and clarified the related misunderstandings [29] , [30] , [31] , [32] , [33] , [34] .…”

Section: Misunderstanding Of the Entransy Theory In Heat Transfermentioning

confidence: 85%

State functions/quantities in thermodynamics and heat transfer

Zhao

Chen

et al. 2022

Fundamental Research

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“…The solution process was substantially sequential, which was similar to pinch technology. The common shortcoming of the sequential methods are the lack of simultaneous consideration for the three-way costs, tending to get suboptimal HENs [14]. Hence, simultaneous methods with mixed integer non-linear programming (MINLP) formulation were proposed and could achieve better HENs than sequential methods [15], the most popular one in which was a stage-wised superstructure (SWS) model proposed by Yee and Grossmann [16].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Cost-Optimal Heat Exchanger Networks Using a Novel Stochastic Algorithm and a Modified Stage-Wised Superstructure

et al. 2021

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Facing the current energy structure urgently needs to be transformed, heat exchanger network (HEN) can implement heat recovery and cost reduction by the arrangement for heat exchanges between cold and hot streams. The plenty of integer and continuous variables involved in HEN synthesis cause the results to be easily trapped in local optima. To avoid this situation, the mechanism of accepting imperfect solutions is added in a novel algorithm called Random Walk Algorithm with Compulsive Evolution. However, several potential solutions maybe abandoned by accepting imperfect solutions. To maintain the global searching ability, and at the same time, protecting the potential solutions during the optimization process, the limitations of accepting imperfect solutions are investigated in this work, then a back substitution strategy and elite optimization strategy based on algorithm are proposed. The former is to identify and adjust the inferior individuals in long-term stagnation while the latter is to keep and perform a fine search for the better solutions. Furthermore, a modified stage-wised superstructure is also developed to implement the flexible placement of utilities, which efficiently enlarges the solution domain. The validation of strategies and model is implemented by three cases, the results are lower, with 2219 $/year, 1280 $/year, and 2M $/year than the best published result, revealing the strong abilities of the proposed method in designing more economical HENs.

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Entransy dissipation-based constraint for optimization of heat exchanger networks in thermal systems

Cited by 42 publications

References 43 publications

Irreversibility and Action of the Heat Conduction Process

Irreversibility and Action of the Heat Conduction Process

State functions/quantities in thermodynamics and heat transfer

Synthesis of Cost-Optimal Heat Exchanger Networks Using a Novel Stochastic Algorithm and a Modified Stage-Wised Superstructure

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