Analyses of the endoreversible Carnot cycle with entropy theory and entransy theory

doi:10.1088/1674-1056/22/11/110506

中国物理B ›› 2013, Vol. 22 ›› Issue (11): 110506-110506.doi: 10.1088/1674-1056/22/11/110506

Analyses of the endoreversible Carnot cycle with entropy theory and entransy theory

王文华, 程雪涛, 梁新刚

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, School of Aerospace, Tsinghua University, Beijing 100084, China

收稿日期:2013-04-01 修回日期:2013-05-21 出版日期:2013-09-28 发布日期:2013-09-28
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 51376101) and the Initiative Scientific Research Program of Tsinghua University, China.

Analyses of the endoreversible Carnot cycle with entropy theory and entransy theory

Wang Wen-Hua (王文华), Cheng Xue-Tao (程雪涛), Liang Xin-Gang (梁新刚)

Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, School of Aerospace, Tsinghua University, Beijing 100084, China

Received:2013-04-01 Revised:2013-05-21 Online:2013-09-28 Published:2013-09-28
Contact: Cheng Xue-Tao E-mail:chengxt06@mails.tsinghua.edu.cn, chengxt02@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 51376101) and the Initiative Scientific Research Program of Tsinghua University, China.

摘要/Abstract

摘要： The endoreversible Carnot cycle is analyzed based on the concepts of entropy generation, entropy generation number, entransy loss, and entransy loss coefficient. The relationships of the cycle output power and heat-work conversion efficiency with these parameters are discussed. For the numerical examples discussed, the preconditions of the application for these concepts are derived. When the inlet temperatures and heat capacity flow rates of hot streams and environment temperature are prescribed, the results show that the concepts of entropy generation and entransy loss are applicable. However, in the presence of various inlet temperatures of streams, larger entransy loss rate still leads to larger output power, while smaller entropy generation rate does not. When the heat capacity flow rates of hot streams are various, neither larger entransy loss rate nor smaller entropy generation rate always leads to larger output power. Larger entransy loss coefficient always leads to larger heat-work conversion efficiency for the cases discussed, while smaller entropy generation number does not always.

关键词: entropy generation, entransy loss coefficient, heat-work conversion efficiency, endoreversible Carnot cycle

Abstract: The endoreversible Carnot cycle is analyzed based on the concepts of entropy generation, entropy generation number, entransy loss, and entransy loss coefficient. The relationships of the cycle output power and heat-work conversion efficiency with these parameters are discussed. For the numerical examples discussed, the preconditions of the application for these concepts are derived. When the inlet temperatures and heat capacity flow rates of hot streams and environment temperature are prescribed, the results show that the concepts of entropy generation and entransy loss are applicable. However, in the presence of various inlet temperatures of streams, larger entransy loss rate still leads to larger output power, while smaller entropy generation rate does not. When the heat capacity flow rates of hot streams are various, neither larger entransy loss rate nor smaller entropy generation rate always leads to larger output power. Larger entransy loss coefficient always leads to larger heat-work conversion efficiency for the cases discussed, while smaller entropy generation number does not always.

Key words: entropy generation, entransy loss coefficient, heat-work conversion efficiency, endoreversible Carnot cycle

中图分类号: (Nonequilibrium and irreversible thermodynamics)

05.70.Ln

07.20.Pe (Heat engines; heat pumps; heat pipes)

王文华, 程雪涛, 梁新刚. Analyses of the endoreversible Carnot cycle with entropy theory and entransy theory[J]. 中国物理B, 2013, 22(11): 110506-110506.

Wang Wen-Hua (王文华), Cheng Xue-Tao (程雪涛), Liang Xin-Gang (梁新刚). Analyses of the endoreversible Carnot cycle with entropy theory and entransy theory[J]. Chin. Phys. B, 2013, 22(11): 110506-110506.

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Analyses of the endoreversible Carnot cycle with entropy theory and entransy theory

Analyses of the endoreversible Carnot cycle with entropy theory and entransy theory

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