Thermal Brownian heat engine with external and internal irreversibilities

Chen, Lingen; Chen, Qi; Ge, Yanlin; Feng, Huijun

doi:10.1016/j.energy.2022.124582

Cited by 32 publications

(3 citation statements)

References 53 publications

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“…A recent review of analytical expressions for the efficiency of two-reservoir heat engines at maximum power, all showing the CA limit near equilibrium, can be found in [8]. Recent advances in the topic of Brownian heat engine are reported also in [9][10][11][12] including generalized efficiency concepts [9], the analysis of Brownian heat engine with ecological criteria [10] and various irreversibility effects on the performance of Brownian heat engines [11,12].…”

Section: Introductionmentioning

confidence: 99%

Efficiency at optimal performance of Brownian heat engines under double tangent constraint

Streitenberger¹

2023

J. Phys. A: Math. Theor.

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A new analytical expression is derived for the efficiency of classical steady-state Brownian heat engines at maximum power under a constraint based on a double tangent construction between the occupation number distributions of the particles in the two heat reservoirs. The efficiency achieves the Carnot limit for small temperature differences and represents a significant overall improvement over the efficiency at unconstrained maximum power, which shows the Curzon-Ahlborn limiting behavior near equilibrium. The applicability of the method to other optimization criteria is demonstrated using the maximum omega criterion as an example. This method can also be applied to quantum distributions, for which, however, only a numerical solution is possible.

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Section: Introductionmentioning

confidence: 99%

Efficiency at optimal performance of Brownian heat engines under double tangent constraint

Streitenberger¹

2023

J. Phys. A: Math. Theor.

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“…Some have introduced FTT theory to search optimal configurations of cycles and devices, including commercial engine [ 6 ], internal combustion engines [ 7 , 8 ], heat exchange system [ 9 ], hydraulic recuperation system [ 10 ], Stirling engines [ 11 , 12 ], refrigerators [ 13 , 14 , 15 ], chemical reactor [ 16 ], finite source heat engines [ 17 , 18 ], etc. Others have introduced FTT theory to search optimal performances of cycles and devices, including Atkinson cycles [ 19 , 20 ], Otto cycles [ 21 , 22 ], Brayton cycles [ 23 , 24 ], Carnot cycles [ 25 , 26 , 27 ], Dual cycles [ 28 , 29 ], Stirling cycles [ 30 , 31 ], thermal Brownian cycles [ 32 , 33 , 34 ], porous medium cycle [ 35 ], combined cycles [ 36 , 37 ], etc. Analyzing and optimizing heat engine (HEG) cycle performances with different objectives is an important research work in the FTT field.…”

Section: Introductionmentioning

confidence: 99%

Efficient Power Characteristic Analysis and Multi-Objective Optimization for an Irreversible Simple Closed Gas Turbine Cycle

Qiu

Chen

et al. 2022

Entropy

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On the basis of the established irreversible simple closed gas turbine cycle model, this paper optimizes cycle performance further by applying the theory of finite-time thermodynamics. Dimensionless efficient power expression of the cycle is derived. Effects of internal irreversibility (turbine and compressor efficiencies) and heat reservoir temperature ratio on dimensionless efficient power are analyzed. When total heat conductance of two heat exchangers is constant, the double maximum dimensionless efficient power of a cycle can be obtained by optimizing heat-conductance distribution and cycle pressure-ratio. Through the NSGA-II algorithm, multi-objective optimizations are performed on the irreversible closed gas turbine cycle by taking five performance indicators, dimensionless power density, dimensionless ecological function, thermal efficiency, dimensionless efficient power and dimensionless power output, as objective functions, and taking pressure ratio and heat conductance distribution as optimization variables. The Pareto frontiers with the optimal solution set are obtained. The results reflect that heat reservoir temperature ratio and compressor efficiency have greatest influences on dimensionless efficient power, and the deviation indexes obtained by TOPSIS, LINMAP and Shannon Entropy decision-making methods are 0.2921, 0.2921, 0.2284, respectively, for five-objective optimization. The deviation index obtained by Shannon Entropy decision-making method is smaller than other decision-making methods and its result is more ideal.

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“…Since the 1970s, Finite Time Thermodynamics (FTT) has made great progress in physics and engineering fields [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. Many scholars have researched the optimal performances of thermal and chemical processes and cycles [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 ]. A great deal of work has been performed for the optimal configurations of thermal and chemical processes and cycles [ 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 ], including heat transfer, mass transfer, heat and mass transfer, ...…”

Section: Introductionmentioning

confidence: 99%

Maximum Profit Output Configuration of Multi-Reservoir Resource Exchange Intermediary

Chen

Xia

2022

Entropy

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A model of a multi-reservoir resource exchange intermediary also defined as a commercial engine is proposed according to analogies and similarities between thermodynamics and economics. The optimal configuration of a multi-reservoir commercial engine with a maximum profit output objective is determined by applying optimal control theory. The optimal configuration consists of two instantaneous constant commodity flux processes and two constant price processes, and the configuration is independent of a number of economic subsystems and commodity transfer law qualitatively. The maximum profit output needs some economic subsystems to never contact with the commercial engine during commodity transfer processes. Numerical examples are provided for a three-economic-subsystem commercial engine with linear commodity transfer law. The effects of price changes of an intermediate economic subsystem on the optimal configuration of a three-economic-subsystem and the performance of optimal configuration are discussed. The research object is general, and the results can provide some theoretical guidelines for operations of actual economic processes and systems.

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Thermal Brownian heat engine with external and internal irreversibilities

Cited by 32 publications

References 53 publications

Efficiency at optimal performance of Brownian heat engines under double tangent constraint

Efficiency at optimal performance of Brownian heat engines under double tangent constraint

Efficient Power Characteristic Analysis and Multi-Objective Optimization for an Irreversible Simple Closed Gas Turbine Cycle

Maximum Profit Output Configuration of Multi-Reservoir Resource Exchange Intermediary

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