Achieving Carnot efficiency in a finite-power Brownian Carnot cycle with arbitrary temperature difference

Miura, Kazukiyo; Izumida, Yuki; Okuda, Koji

doi:10.1103/physreve.105.034102

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…There are several reasons why the Stirling engine is able to achieve high theoretical efficiency. Firstly and mainly, the Carnot equation proves the efficiency, which is an ideal cycle with the max thermal efficiency [6].…”

Section: Efficiency and Heat Lossmentioning

confidence: 99%

Enhancing alpha solar stirling engine performance with regenerator

2023

TNS

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Nowadays, as traditional fossil energy sources are in decline, renewable energy sources are being actively sought, and the use of renewable energy is receiving widespread attention. The Dish engine solar power plant is vital in using solar energy. The Stirling engine is the fundamental element of the power plant, responsible for energy conversion. And the internal regenerator has an essential influence on the engine's performance. Hence, this paper focuses on the analysis and improvement of the regenerator. Heat transportation determines its efficiency, while the regenerator is the core component. An efficient Stirling engine cannot occur without a high-quality regenerator. This paper uses simulation experiments to explore the impact of various materials on the regenerator's performance. By comparing the regenerator performance of filled copper foam and stainless-steel mesh, it was found that the copper foam regenerator had a faster start time, while the stainless-steel mesh regenerator had a higher thermal capacity. After this conclusion, an optimized regenerator is designed, filled with different materials at each end according to the material properties. After simulations, it can be concluded that this enhancement improves the regenerator's performance, increasing the Stirling engine's overall efficiency.

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Section: Efficiency and Heat Lossmentioning

confidence: 99%

Enhancing alpha solar stirling engine performance with regenerator

2023

TNS

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“…-One open question in current thermodyamic research is whether a heat engine may achieve Carnot efficiency while delivering finite power [1][2][3][4][5][6]. In a seminal paper [1], Benenti et al have established that, within the framework of linear response theory, Carnot efficiency could be achieved by a thermoelectric device immersed in a magneic field B provided the Seebeck coefficient is not even under the reversal of B:…”

Section: Introductionmentioning

confidence: 99%

False Onsager relations

Campisi

2023

EPL

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Recent research suggests that when a system has a “false time reversal violation” the Onsager reciprocity relations hold despite the presence of a magnetic field. The purpose of this work is to clarify that the Onsager relations may well be violated in presence of a “false time reversal violation”: that rather guarantees the validity of distinct relations, which we dub “false Onsager relations”. We also point out that for quantum systems “false time reversal violation” is omnipresent and comment that, per se, this has in general no consequence in regard to the validity of Onsager relations, or the more general non-equilibrium fluctuation relations, in presence of a magnetic field. Our arguments are illustrated with the Heisenberg model of a magnet in an external magnetic field.

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“…( 1) and ( 2) do not provide any answers. By quantifying the effect of the irreversible dissipation intrinsic in the finite-time operation of the heat engines based on non-equilibrium theories or specific models, various efficiency formulae for heat engines operating at maximum power [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23], trade-off relations between efficiency and power [24][25][26][27][28][29][30][31], and tighter bounds for efficiency than that provided by Eq. ( 1) [32][33][34][35][36][37][38][39] have been obtained.…”

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confidence: 99%

Irreversible efficiency and Carnot theorem for heat engines operating with multiple heat baths in linear response regime

Izumida¹

2022

Preprint

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The Carnot theorem, one expression of the second law of thermodynamics, places a fundamental upper bound on the efficiency of heat engines operating between two heat baths. The Carnot theorem can be stated in a more generalized form for heat engines operating with multiple heat baths, where the maximum efficiency is achieved for reversible heat engines operating quasistatically between two heat baths. In this study, we determine the irreversible efficiency of general heat engines operating in a linear response regime by quantifying the impact of the dissipation by irreversible operations. The generalized Carnot theorem is derived as a natural consequence of it. Because the result obtained is based on the linear response relation and fluctuation-dissipation theorem in the universal framework of linear response theory, it has wide applicability to heat engines operating in the linear response regime.

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Achieving Carnot efficiency in a finite-power Brownian Carnot cycle with arbitrary temperature difference

Cited by 9 publications

References 32 publications

Enhancing alpha solar stirling engine performance with regenerator

Enhancing alpha solar stirling engine performance with regenerator

False Onsager relations

Irreversible efficiency and Carnot theorem for heat engines operating with multiple heat baths in linear response regime

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