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Exergy, An International Journal最新文献

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Work and entropy production aspects of irreversible processes in closed and steady-state open systems 封闭系统和稳态开放系统中不可逆过程的功和熵产方面
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00049-8
Giacomo Bisio, Giuseppe Rubatto
{"title":"Work and entropy production aspects of irreversible processes in closed and steady-state open systems","authors":"Giacomo Bisio,&nbsp;Giuseppe Rubatto","doi":"10.1016/S1164-0235(01)00049-8","DOIUrl":"10.1016/S1164-0235(01)00049-8","url":null,"abstract":"<div><p>This paper systematically deals with the influence of different sources of irreversibilities in work transfer expressions for closed and steady-state open systems. In the various cases, the hypotheses necessary to an analytical formulation and therefore the limits of the latter are specified. The influence of the non-uniformity of temperature and pressure on the irreversibilities in the system is particularly examined. The main aim is that of deducing a criterion with the conditions sufficient to separate in distinct relations the different phenomena (mechanical, electrical, chemical, etc.) simultaneously present in the same system.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 192-205"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(01)00049-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73631266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Mixed convection and entropy generation in a vertical annular space 垂直环形空间中混合对流和熵的产生
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00092-4
Syeda Humaira Tasnim , Shohel Mahmud
{"title":"Mixed convection and entropy generation in a vertical annular space","authors":"Syeda Humaira Tasnim ,&nbsp;Shohel Mahmud","doi":"10.1016/S1164-0235(02)00092-4","DOIUrl":"10.1016/S1164-0235(02)00092-4","url":null,"abstract":"<div><p>Present research efforts mainly focus on the nature of irreversibility, in terms of entropy generation, inside a vertical cylindrical annulus. Laminar mixed convective flow of a Newtonian fluid is considered. We seek for the closed form of analytical solutions by solving the simplified governing equations in cylindrical coordinates. Isothermal boundary condition is applied. Analytical expressions for the velocity and temperature are derived which essentially expedite to obtain expressions for local and average entropy generation in the annular space. Further ‘<em>entropy generation minimization</em>’ is applied to calculate the optimum radius ratio (<em>Π</em><sub>opt</sub>) as a function of group parameter (<span><math><mtext>Br</mtext><mtext>/Ω)</mtext></math></span> and the ratio of Grashof and Reynolds numbers (Gr/Re). Finally a correlation is proposed for calculating optimum radius ratio.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 373-379"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00092-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75959437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
Introducing a series of viewpoint articles 介绍一系列观点文章
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00053-X
Ibrahim Dincer (Editor-in-Chief)
{"title":"Introducing a series of viewpoint articles","authors":"Ibrahim Dincer (Editor-in-Chief)","doi":"10.1016/S1164-0235(01)00053-X","DOIUrl":"10.1016/S1164-0235(01)00053-X","url":null,"abstract":"","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 1","pages":"Page 2"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(01)00053-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76653709","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The equivalent combined cycle of an irreversible chemical potential transformer and its optimal performance 不可逆化学电位互感器的等效联合循环及其最优性能
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00060-2
Guoxing Lin , Jincan Chen , Chih Wu
{"title":"The equivalent combined cycle of an irreversible chemical potential transformer and its optimal performance","authors":"Guoxing Lin ,&nbsp;Jincan Chen ,&nbsp;Chih Wu","doi":"10.1016/S1164-0235(02)00060-2","DOIUrl":"10.1016/S1164-0235(02)00060-2","url":null,"abstract":"<div><p>A chemical potential transformer operating among three reservoirs at different chemical potentials is analogous to a heat transformer operating among three heat reservoirs. When the influence of finite-rate mass transfer between the working fluid and the reservoirs is taken into account, a chemical potential transformer may be conceived as a combined system having a chemical pump driven by a chemical engine. The fundamental optimal relations of the chemical engine and pump operating between two reservoirs are used to derive the fundamental optimal relation of the chemical potential transformer. Consequently, it is proved that such a combined cycle system is equivalent to the chemical potential transformer operating among three reservoirs at different chemical potentials. Moreover, the main optimal performances of the chemical potential transformer are discussed. The results obtained here may reveal some inherent connections between the chemical potential transformer and the chemical engine and provide a theoretical base for the development of chemical potential transformers.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 2","pages":"Pages 119-124"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00060-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79214318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 11
Exergy analysis and experimental study of heat pump systems 热泵系统的火用分析与实验研究
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00083-3
E. Bilgen, H. Takahashi
{"title":"Exergy analysis and experimental study of heat pump systems","authors":"E. Bilgen,&nbsp;H. Takahashi","doi":"10.1016/S1164-0235(02)00083-3","DOIUrl":"10.1016/S1164-0235(02)00083-3","url":null,"abstract":"<div><p>Exergy analysis of heat pump—air conditioner systems has been carried out. The irreversibilities due to heat transfer and friction have been considered. The coefficient of performance based on the first law of thermodynamics as a function of various parameters, their optimum values, and the efficiency and coefficient of performance based on exergy analysis have been derived. Based on the exergy analysis, a simulation program has been developed to simulate and evaluate experimental systems. The simulation of a domestic heat pump—air conditioner of 959 W nominal power (Matsushita room air conditioner model CS-XG28M) is then carried out using experimental data. It is found that COP based on the first law varies from 7.40 to 3.85 and the exergy efficiency from 0.37 to 0.25 both a decreasing function of heating or cooling load. The exergy destructions in various components are determined for further study and improvement of its performance.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 259-265"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00083-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81688996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 68
Thermodynamic analysis of flow and heat transfer inside channel with two parallel plates 双平行板通道内流动与传热的热力学分析
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00062-6
Shohel Mahmud, Roydon Andrew Fraser
{"title":"Thermodynamic analysis of flow and heat transfer inside channel with two parallel plates","authors":"Shohel Mahmud,&nbsp;Roydon Andrew Fraser","doi":"10.1016/S1164-0235(02)00062-6","DOIUrl":"10.1016/S1164-0235(02)00062-6","url":null,"abstract":"<div><p>We investigate analytically the first and second law characteristics of fluid flow and heat transfer inside a channel having two parallel plates with finite gap between them. Fully developed forced convection is considered. Fluid is assumed non-Newtonian and followed the power law model. Analytical expressions for dimensionless entropy generation number (<em>N</em><sub>S</sub>), irreversibility distribution ratio (<em>Φ</em>) and Bejan number (<em>Be</em>) are determined as a function of dimensionless distance (<em>Y</em>), Peclet number (<em>Pe</em>), Eckert number (<em>E</em>), Prandtl number (<em>Pr</em>), dimensionless temperature difference (<span><math><mtext>Ω)</mtext></math></span> and fluid index (<em>m</em> and <em>n</em>). Spatial distribution of entropy generation number, irreversibility ratio and Bejan number are presented graphically.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 140-146"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00062-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83766222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 90
Analysis of mixed convection—Radiation interaction in a vertical channel: Entropy generation 垂直通道中对流-辐射混合相互作用的分析:熵的产生
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00075-4
Shohel Mahmud, Roydon Andrew Fraser
{"title":"Analysis of mixed convection—Radiation interaction in a vertical channel: Entropy generation","authors":"Shohel Mahmud,&nbsp;Roydon Andrew Fraser","doi":"10.1016/S1164-0235(02)00075-4","DOIUrl":"10.1016/S1164-0235(02)00075-4","url":null,"abstract":"<div><p>This work examines analytically the effects of radiation heat transfer on mixed convection through a vertical channel in the presence of transverse magnetic field. Both First and Second Laws of thermodynamics are applied to analyze the problem. Special focus is given on the entropy generation characteristics and its dependency on the various dimensionless parameters, i.e. Hartmann number (<em>Ha</em>), Plank number (<em>Pl</em>), Richardson number (<em>Ri</em>), group parameter (<em>Br</em>/<em>Π</em>) etc. A steady-laminar flow of an incompressible-viscous fluid is assumed through the channel with negligible inertia effect. Fluid is further considered as an optically thin gas and electrically conducting. Governing equations in Cartesian coordinate are solved analytically after reasonable simplifications. Expressions for velocity, temperature, local, and average entropy generation rate are derived and presented graphically.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 330-339"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00075-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74667077","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 47
Exergy conservation: An alternative to conserving the already conserved quantity energy 能量守恒:对已经守恒的能量的另一种选择
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00055-9
Marc A. Rosen
{"title":"Exergy conservation: An alternative to conserving the already conserved quantity energy","authors":"Marc A. Rosen","doi":"10.1016/S1164-0235(02)00055-9","DOIUrl":"10.1016/S1164-0235(02)00055-9","url":null,"abstract":"<div><p>The author explains his view that we need to clarify our use and understanding of the term <em>energy conservation</em>, in particular by referring to <em>exergy conservation</em> when that is what we mean, so that we can more effectively address energy-related problems and issues.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 2","pages":"Pages 59-61"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00055-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88785836","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Optimal fin geometry based on exergoeconomic analysis for a pin-fin array with application to electronics cooling 基于耗功经济分析的引脚鳍阵列最佳翅片几何形状及其在电子冷却中的应用
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00081-X
S.Z. Shuja
{"title":"Optimal fin geometry based on exergoeconomic analysis for a pin-fin array with application to electronics cooling","authors":"S.Z. Shuja","doi":"10.1016/S1164-0235(02)00081-X","DOIUrl":"10.1016/S1164-0235(02)00081-X","url":null,"abstract":"<div><p>Exergoeconomic analysis for a pin-fin array involves the achievement of a balance between the entropy generation due to heat transfer and pressure drop, while considering the unit cost of entropy generation. This process yields the optimum fin operation parameters based on minimum cost. In this study, analytical equations are presented considering the cost of operation for a pin-fin array. The solution of these equations would give the optimum fin diameter and length that result in a fin array with minimum operational cost. In addition, the influence of important fin thermal, physical, geometrical and cost parameters on the optimum diameter and length is presented in graphical form for quick calculations and easy interpretation. The presented results are subjected to the constraint that <em>L</em>/<em>D</em> is of the order of 1 or greater than 1. A case is also presented to demonstrate the use of the model for conditions typically found in cooling of electronic components.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 248-258"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00081-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88819866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 38
A finite time analysis of combined Carnot driving and cooling cycles optimised for maximum refrigeration effect with applications to absorption refrigeration systems 联合卡诺驱动和冷却循环的有限时间分析优化了最大的制冷效果与应用于吸收式制冷系统
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00069-9
B. Agnew, A. Alikitiwi, A.A. Anderson, E.H. Fisher, I. Potts
{"title":"A finite time analysis of combined Carnot driving and cooling cycles optimised for maximum refrigeration effect with applications to absorption refrigeration systems","authors":"B. Agnew,&nbsp;A. Alikitiwi,&nbsp;A.A. Anderson,&nbsp;E.H. Fisher,&nbsp;I. Potts","doi":"10.1016/S1164-0235(02)00069-9","DOIUrl":"10.1016/S1164-0235(02)00069-9","url":null,"abstract":"<div><p>A finite time analysis of an ideal refrigeration cycle with the objective of maximising refrigeration effect has been performed. The optimised refrigeration cycle has then been combined with an optimised power cycle to produce a combined cycle. The general matching requirements of the two cycles are discussed. The cycles are then combined in a specific way such that they become a model for an ideal absorption refrigeration cycle. The influence of the design parameters on the performance of the combined cycle is analysed. The performance of an experimental absorption unit is compared with the predictions made by the analysis.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 186-191"},"PeriodicalIF":0.0,"publicationDate":"2002-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(02)00069-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87325995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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