Power and heat-work conversion efficiency analyses for the irreversible Carnot engines by entransy and entropy

被引:17
作者
Zhou, Bing [1 ]
Cheng, XueTao [1 ]
Liang, XinGang [1 ]
机构
[1] Tsinghua Univ, Dept Engn Mech, Key Lab Thermal Sci & Power Engn, Minist Educ, Beijing 100084, Peoples R China
关键词
GENERATION MINIMIZATION; TRANSFER LAW; CONSTRUCTAL OPTIMIZATION; DISSIPATION EXTREMUM; ENERGY-CONSERVATION; OPTIMAL RATIOS; PISTON SPEEDS; PERFORMANCE; DESIGN; OUTPUT;
D O I
10.1063/1.4797494
中图分类号
O59 [应用物理学];
学科分类号
摘要
The concepts of entransy and entropy are applied to the analyses of the irreversible Carnot engines based on the finite time thermodynamics. Taking the maximum output power and the maximum heat-work conversion efficiency (HWCE) as objectives, the applicability of the entransy theory and the entropy generation minimization method to the optimizations is investigated. For the entransy theory, the results show that the maximum entransy loss rate always relates to the maximum output power, while the maximum entransy loss coefficient always leads to the maximum HWCE for all the cases discussed in this paper. For the concept of entropy generation, the maximum entropy generation rate corresponds to the maximum output power when the Carnot engine works between infinite heat reservoirs, while the entropy generation number cannot be defined in this case. When the Carnot engine works between the finite heat reservoirs provided by streams, the minimum entropy generation rate corresponds to the maximum output power with prescribed heat flow capacity rates and inlet temperatures of the streams, while the minimum entropy generation number corresponds to the maximum HWCE. When the heat capacity flow rate of the hot stream is not prescribed, the entropy generation rate increases with increasing output power, while the entropy generation number decreases with increasing HWCE. When the inlet temperature of the hot stream is not prescribed, the entropy generation rate increases with increasing output power, and the entropy generation number also increases with increasing HWCE. (C) 2013 American Institute of Physics. [http://dx.doi.org/10.1063/1.4797494]
引用
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页数:10
相关论文
共 54 条
[2]  
Bejan A., 1997, Advanced Engineering Thermodynamics, Vsecond
[3]  
Carnot S., 1824, REFLECTIONS ON THE M
[4]   THE MAXIMUM POWER OUTPUT AND MAXIMUM EFFICIENCY OF AN IRREVERSIBLE CARNOT HEAT ENGINE [J].
CHEN, JC .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1994, 27 (06) :1144-1149
[5]  
Chen L., 2004, Advances in Finite Time Thermodynamics: Analysis and Optimization
[6]   Optimal configuration and performance for a generalized Carnot cycle assuming the heat-transfer law Q α (ΔT)m [J].
Chen, LG ;
Zhu, XQ ;
Sun, FR ;
Wu, C .
APPLIED ENERGY, 2004, 78 (03) :305-313
[7]   Effect of heat transfer law on the performance of a generalized irreversible Carnot engine [J].
Chen, LG ;
Sun, FR ;
Wu, C .
JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1999, 32 (02) :99-105
[8]   Influence of internal heat leak on the power versus efficiency characteristics of heat engines [J].
Chen, LG ;
Sun, FR ;
Wu, C .
ENERGY CONVERSION AND MANAGEMENT, 1997, 38 (14) :1501-1507
[9]   Finite time thermodynamic optimization or entropy generation minimization of energy systems [J].
Chen, LG ;
Wu, C ;
Sun, FR .
JOURNAL OF NON-EQUILIBRIUM THERMODYNAMICS, 1999, 24 (04) :327-359
[10]   T-shaped assembly of fins with constructal entransy dissipation rate minimization [J].
Chen, Lingen ;
Xiao, Qinghua ;
Xie, Zhihui ;
Sun, Fengrui .
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 2012, 39 (10) :1556-1562