Entransy analyses of heat-work conversion systems with inner irreversible thermodynamic cycles

doi:10.1088/1674-1056/24/12/120503

中国物理B ›› 2015, Vol. 24 ›› Issue (12): 120503-120503.doi: 10.1088/1674-1056/24/12/120503

Entransy analyses of heat-work conversion systems with inner irreversible thermodynamic cycles

程雪涛, 梁新刚

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

收稿日期:2015-06-08 修回日期:2015-08-13 出版日期:2015-12-05 发布日期:2015-12-05
通讯作者: Cheng Xue-Tao E-mail:chengxt02@gmail.com
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51376101 and 51356001).

Entransy analyses of heat-work conversion systems with inner irreversible thermodynamic cycles

Cheng Xue-Tao (程雪涛), Liang Xin-Gang (梁新刚)

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

Received:2015-06-08 Revised:2015-08-13 Online:2015-12-05 Published:2015-12-05
Contact: Cheng Xue-Tao E-mail:chengxt02@gmail.com
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51376101 and 51356001).

摘要/Abstract

摘要： In this paper, we try to use the entransy theory to analyze the heat-work conversion systems with inner irreversible thermodynamic cycles. First, the inner irreversible thermodynamic cycles are analyzed. The influences of different inner irreversible factors on entransy loss are discussed. We find that the concept of entransy loss can be used to analyze the inner irreversible thermodynamic cycles. Then, we analyze the common heat-work conversion systems with inner irreversible thermodynamic cycles. As an example, the heat-work conversion system in which the working fluid of the thermodynamic cycles is heated and cooled by streams is analyzed. Our analyses show that larger entransy loss leads to larger output work when the total heat flow from the high temperature heat source and the corresponding equivalent temperature are fixed. Some numerical cases are presented, and the results verify the theoretical analyses. On the other hand, it is also found that larger entransy loss does not always lead to larger output work when the preconditions are not satisfied.

关键词: entransy loss, heat-work conversion, inner irreversible thermodynamic cycle, analyses

Abstract: In this paper, we try to use the entransy theory to analyze the heat-work conversion systems with inner irreversible thermodynamic cycles. First, the inner irreversible thermodynamic cycles are analyzed. The influences of different inner irreversible factors on entransy loss are discussed. We find that the concept of entransy loss can be used to analyze the inner irreversible thermodynamic cycles. Then, we analyze the common heat-work conversion systems with inner irreversible thermodynamic cycles. As an example, the heat-work conversion system in which the working fluid of the thermodynamic cycles is heated and cooled by streams is analyzed. Our analyses show that larger entransy loss leads to larger output work when the total heat flow from the high temperature heat source and the corresponding equivalent temperature are fixed. Some numerical cases are presented, and the results verify the theoretical analyses. On the other hand, it is also found that larger entransy loss does not always lead to larger output work when the preconditions are not satisfied.

Key words: entransy loss, heat-work conversion, inner irreversible thermodynamic cycle, analyses

中图分类号: (Nonequilibrium and irreversible thermodynamics)

05.70.Ln

44.90.+c (Other topics in heat transfer)

程雪涛, 梁新刚. Entransy analyses of heat-work conversion systems with inner irreversible thermodynamic cycles[J]. 中国物理B, 2015, 24(12): 120503-120503.

Cheng Xue-Tao (程雪涛), Liang Xin-Gang (梁新刚). Entransy analyses of heat-work conversion systems with inner irreversible thermodynamic cycles[J]. Chin. Phys. B, 2015, 24(12): 120503-120503.

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Entransy analyses of heat-work conversion systems with inner irreversible thermodynamic cycles

Entransy analyses of heat-work conversion systems with inner irreversible thermodynamic cycles

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