Output power analyses of an endoreversible Carnot heat engine with irreversible heat transfer processes based on generalized heat transfer law

doi:10.1088/1674-1056/24/7/070506

中国物理B ›› 2015, Vol. 24 ›› Issue (7): 70506-070506.doi: 10.1088/1674-1056/24/7/070506

Output power analyses of an endoreversible Carnot heat engine with irreversible heat transfer processes based on generalized heat transfer law

吴艳秋

Chongqing Three Gorges University, Chongqing 404100, China

收稿日期:2014-11-22 修回日期:2015-01-28 出版日期:2015-07-05 发布日期:2015-07-05
基金资助:
Project supported by the Youth Programs of Chongqing Three Gorges University, China (Grant No. 13QN18).

Output power analyses of an endoreversible Carnot heat engine with irreversible heat transfer processes based on generalized heat transfer law

Wu Yan-Qiu (吴艳秋)

Chongqing Three Gorges University, Chongqing 404100, China

Received:2014-11-22 Revised:2015-01-28 Online:2015-07-05 Published:2015-07-05
Contact: Wu Yan-Qiu E-mail:wuyanqiu0516@126.com
Supported by:
Project supported by the Youth Programs of Chongqing Three Gorges University, China (Grant No. 13QN18).

摘要/Abstract

摘要： In this paper, an endoreversible Carnot heat engine with irreversible heat transfer processes is analyzed based on generalized heat transfer law. The applicability of the entropy generation minimization, exergy analyses method, and entransy theory to the analyses is discussed. Three numerical cases are presented. It is shown that the results obtained from the entransy theory are different from those from the entropy generation minimization, which is equivalent to the exergy analyses method. For the first case in which the application preconditions of the entropy generation minimization and entransy loss maximization are satisfied, both smaller entropy generation rate and larger entransy loss rate lead to larger output power. For the second and third cases in which the preconditions are not satisfied, the entropy generation minimization does not lead to the maximum output power, while larger entransy loss rate still leads to larger output power in the third case. For the discussed cases, the concept of entransy dissipation is not applicable for the analyses of output power. The problems in the negative comments on the entransy theory are pointed out and discussed. The related researchers are advised to focus on some new specific application cases to show if the entransy theory is the same as some other theories.

关键词: entropy generation, exergy destruction, entransy, endoreversible Carnot heat engine

Abstract: In this paper, an endoreversible Carnot heat engine with irreversible heat transfer processes is analyzed based on generalized heat transfer law. The applicability of the entropy generation minimization, exergy analyses method, and entransy theory to the analyses is discussed. Three numerical cases are presented. It is shown that the results obtained from the entransy theory are different from those from the entropy generation minimization, which is equivalent to the exergy analyses method. For the first case in which the application preconditions of the entropy generation minimization and entransy loss maximization are satisfied, both smaller entropy generation rate and larger entransy loss rate lead to larger output power. For the second and third cases in which the preconditions are not satisfied, the entropy generation minimization does not lead to the maximum output power, while larger entransy loss rate still leads to larger output power in the third case. For the discussed cases, the concept of entransy dissipation is not applicable for the analyses of output power. The problems in the negative comments on the entransy theory are pointed out and discussed. The related researchers are advised to focus on some new specific application cases to show if the entransy theory is the same as some other theories.

Key words: entropy generation, exergy destruction, entransy, endoreversible Carnot heat engine

中图分类号: (Nonequilibrium and irreversible thermodynamics)

05.70.Ln

44.90.+c (Other topics in heat transfer)

吴艳秋. Output power analyses of an endoreversible Carnot heat engine with irreversible heat transfer processes based on generalized heat transfer law[J]. 中国物理B, 2015, 24(7): 70506-070506.

Wu Yan-Qiu (吴艳秋). Output power analyses of an endoreversible Carnot heat engine with irreversible heat transfer processes based on generalized heat transfer law[J]. Chin. Phys. B, 2015, 24(7): 70506-070506.

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Output power analyses of an endoreversible Carnot heat engine with irreversible heat transfer processes based on generalized heat transfer law

Output power analyses of an endoreversible Carnot heat engine with irreversible heat transfer processes based on generalized heat transfer law

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