2024-03-29T00:40:35Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/850882022-11-17T02:08:08Zhdl_2115_20039hdl_2115_116Achieving Carnot efficiency in a finite-power Brownian Carnot cycle with arbitrary temperature differenceMiura, Kosuke1000070648815Izumida, YukiOkuda, Kojiopen access©2022 American Physical Society420Achieving 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.American Physical Society (APS)2022-03-01engjournal articleVoRhttp://hdl.handle.net/2115/85088https://doi.org/10.1103/PhysRevE.105.0341022470-0045Physical Review E1053034102https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/85088/1/PhysRevE_105%283%29_034102.pdfapplication/pdf819.18 KB2022-03-01