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

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Title: Achieving Carnot efficiency in a finite-power Brownian Carnot cycle with arbitrary temperature difference
Authors: Miura, Kosuke Browse this author
Izumida, Yuki Browse this author →KAKEN DB
Okuda, Koji Browse this author
Issue Date: 1-Mar-2022
Publisher: American Physical Society (APS)
Journal Title: Physical Review E
Volume: 105
Issue: 3
Start Page: 034102
Publisher DOI: 10.1103/PhysRevE.105.034102
Abstract: Achieving the Carnot efficiency at finite power is a challenging problem in heat engines due to the trade-off relation between efficiency and power that holds for general heat engines. It is pointed out that the Carnot efficiency at finite power may be achievable in the vanishing limit of the relaxation times of a system without breaking the trade-off relation. However, any explicit model of heat engines that realizes this scenario for arbitrary temperature difference has not been proposed. Here, we investigate an underdamped Brownian Carnot cycle where the finite-time adiabatic processes connecting the isothermal processes are tactically adopted. We show that in the vanishing limit of the relaxation times in the above cycle, the compatibility of the Carnot efficiency and finite power is achievable for arbitrary temperature difference. This is theoretically explained based on the trade-off relation derived for our cycle, which is also confirmed by numerical simulations.
Rights: ©2022 American Physical Society
Type: article
URI: http://hdl.handle.net/2115/85088
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 奥田 浩司

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