文献类型：期刊文献

英文题名：Optimum entropy generation structure and partial efficiencies of finite-time carnot heat engines under performance limit conditions

作者：Zhao, Bo[1,2];Zhao, Zimo[3]

第一作者：Zhao, Bo

通讯作者：Zhao, B[1]

机构：[1]Taiyuan Univ Technol, Dept Bldg Environm & Energy Applicat Engn, Taiyuan 030024, Peoples R China;[2]Taiyuan Heavy Machinery Grp Co Ltd, State Key Lab Intelligent Min Equipment Technol, Taiyuan 030032, Peoples R China;[3]Beijing Union Univ, Dept Urban Sci, Beijing 100191, Peoples R China

第一机构：Taiyuan Univ Technol, Dept Bldg Environm & Energy Applicat Engn, Taiyuan 030024, Peoples R China

通讯机构：[1]corresponding author), Taiyuan Univ Technol, Dept Bldg Environm & Energy Applicat Engn, Taiyuan 030024, Peoples R China.

年份：2026

卷号：342

外文期刊名：ENERGY

收录：;EI(收录号：20255019695040);Scopus(收录号：2-s2.0-105024305679);WOS:【SCI-EXPANDED(收录号:WOS:001641100400001)】；

基金：B.Z. acknowledges the financial support from the Shanxi Province Natural Science Foundation, China (Grant No. 202303021211250) .

语种：英文

外文关键词：Partial entropy generation; Entropy transfer efficiency; Partial efficiency; Power-efficiency tradeoff; Internal irreversibility; Finite-time Carnot heat engines; Ecological function

摘要：To explore the entropy production structure during an irreversible Carnot engine cycle consisting of the partial entropy generations within the hot- and cold-end fluids arisen from the external and internal irreversibilities, we establish the partial thermal efficiency and the partial entropy transfer efficiency concepts and their relationship between them by splitting the entire engine into the tandem construction connected by an intermediate reservoir at the weighted temperature. We derive the novel lower and upper bounds of the optimum internal and external entropy transfer efficiencies (entropic efficiencies) at maximum ecological function connecting with the optimum linear irreversible entropy generation structure that reaches the performance limits, which shows a better correlation with the operating data of power plants than the low-dissipation (LD) model at maximum power or ecological function. We obtain two bounds of the instantaneous power at an arbitrary thermal (entropic) efficiency for the LD engines, which are identical to the previous average power results. We also clarify four physical interpretations of the Curzon and Ahlborn's effectiveness (defined as the ratio of the actual and ideal Carnot efficiencies), and recover the Augulo-Brown's thermal efficiency at maximum ecological function and the thermal and entropy transfer efficiency limits of the LD model. These conclusions can be extended to the thermal devices including refrigerators and heat pumps.