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Exergy, An International Journal最新文献

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Should we educate the public about exergy? 我们应该对公众进行能源教育吗?
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00084-5
Marc A. Rosen (Associate Editor)
{"title":"Should we educate the public about exergy?","authors":"Marc A. Rosen (Associate Editor)","doi":"10.1016/S1164-0235(02)00084-5","DOIUrl":"10.1016/S1164-0235(02)00084-5","url":null,"abstract":"<div><p>The author explains his views that the public is often confused when it discusses energy, and needs to be better educated about exergy if energy issues and problems are to be addressed appropriately.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 211-213"},"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)00084-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82453354","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
Exergy-based performance analysis of the heavy-duty gas turbine in part-load operating conditions 重型燃气轮机部分负荷工况下基于火用的性能分析
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00050-4
T.W. Song , J.L. Sohn , J.H. Kim , T.S. Kim , S.T. Ro
{"title":"Exergy-based performance analysis of the heavy-duty gas turbine in part-load operating conditions","authors":"T.W. Song ,&nbsp;J.L. Sohn ,&nbsp;J.H. Kim ,&nbsp;T.S. Kim ,&nbsp;S.T. Ro","doi":"10.1016/S1164-0235(01)00050-4","DOIUrl":"10.1016/S1164-0235(01)00050-4","url":null,"abstract":"<div><p>The present study describes details of exergy-based performance characteristics of a heavy-duty gas turbine, 150MW-class GE 7F model. Results have shown that a chemical reaction in the combustor of which the exergy destruction ratio is 28.3% at full-load is one of the major sources of exergy destructions in the gas turbine. It was found that, in spite of its usefulness to the performance enhancement of the combined cycle plant in part-load operations, the variable inlet guide vane located in front of the multi-stage compressor caused the increase of exergy destruction in the first stage (about 10 times lager than that of other stages below 80% load) and decreased the overall compressor efficiency. Also, it was discovered that the magnitude of exergy destruction by the cooling air in turbine stages is large enough to influence the overall turbine efficiency. The exergy destruction by the cooling air is more than half of the total exergy destruction of each cooled turbine stage.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 2","pages":"Pages 105-112"},"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)00050-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81804753","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: 43
The classical derivation of entropy: A reexamination 熵的经典推导:再检验
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00072-9
Lindon C. Thomas
{"title":"The classical derivation of entropy: A reexamination","authors":"Lindon C. Thomas","doi":"10.1016/S1164-0235(02)00072-9","DOIUrl":"10.1016/S1164-0235(02)00072-9","url":null,"abstract":"<div><p>Classical approaches to the formulation of the defining equation for entropy are presented in this paper that eliminate dependence on the arbitrary treatment of the Carnot function <em>f</em>(<em>θ</em>) that has long existed and is featured in modern thermodynamic textbooks.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 135-139"},"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)00072-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84967579","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
Exergy and government policy: Is there a link? 能源和政府政策:有联系吗?
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00088-2
Marc A. Rosen (Associate Editor)
{"title":"Exergy and government policy: Is there a link?","authors":"Marc A. Rosen (Associate Editor)","doi":"10.1016/S1164-0235(02)00088-2","DOIUrl":"10.1016/S1164-0235(02)00088-2","url":null,"abstract":"<div><p>The author explains his views that aspects of exergy relate to government policies in a variety of fields, including natural resources, energy, environment and industrial development, and that our governments need to use—or be encouraged to use—exergy in establishing public policies, to increase the benefits they bring.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 224-226"},"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)00088-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83152614","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: 9
Examining the merging and splitting processes in daily life in the light of exergy 从能量的角度审视日常生活中的融合与分裂过程
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00058-4
Y.A. Çengel
{"title":"Examining the merging and splitting processes in daily life in the light of exergy","authors":"Y.A. Çengel","doi":"10.1016/S1164-0235(02)00058-4","DOIUrl":"10.1016/S1164-0235(02)00058-4","url":null,"abstract":"<div><p>When two thermodynamic systems at different states are mixed, the exergy contend of the combined “bigger” system may actually be smaller than the exergy content of either of the two systems. Therefore, from the second-law point of view, mixing of systems should be avoided unless the systems being mixed are nearly at the same state. In this paper, we examine the merging and breaking up of families, companies, and states using the entropy generation and exergy destruction associated with various mixing processes of thermodynamic systems as a guide.</p><p>In analogy to thermodynamic systems, we present arguments that the more dissimilar are the items being merged, the larger the destruction of the figure of merit or exergy. Therefore, forcing very dissimilar things into a unity may create highly destructive situations. Also, things that are similar in some aspects and dissimilar in other aspects should be combined only partially, involving the similar aspects only. The individual items should maintain their individuality in regard to the dissimilar aspects to avoid destruction. It is also pointed out that breaking up of countries, companies, and even families with irreconcilable differences may sometimes be the best thing to do, and each part of the whole may be much better off after the break-up.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 128-134"},"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)00058-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82720328","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: 6
The effect of friction on the performance of an air standard dual cycle 摩擦对空气标准双循环性能的影响
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00067-5
Wenhua Wang , Lingen Chen , Fengrui Sun , Chih Wu
{"title":"The effect of friction on the performance of an air standard dual cycle","authors":"Wenhua Wang ,&nbsp;Lingen Chen ,&nbsp;Fengrui Sun ,&nbsp;Chih Wu","doi":"10.1016/S1164-0235(02)00067-5","DOIUrl":"10.1016/S1164-0235(02)00067-5","url":null,"abstract":"<div><p>An irreversible air standard Dual cycle model is proposed in this paper. The finite-time evolution of the cycle's compression and power stroke is taken into account and its global losses lumped in a friction-like term is also considered. The analytical formulas of power output versus compression ratio and efficiency versus compression ratio of the cycle are derived. They are generalized formulas for internal combustion engines because they include the performance characteristic of special cases of Diesel and Otto engines. The effects of various design parameters on the performance of the cycle are demonstrated by one numerical example. The model leads to loop-shaped power-versus-efficiency curve as is common to almost all real heat engines.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 340-344"},"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)00067-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89585656","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: 44
Thermodynamic analysis of a beer engine 啤酒发动机的热力学分析
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00059-6
Frederick W. Call
{"title":"Thermodynamic analysis of a beer engine","authors":"Frederick W. Call","doi":"10.1016/S1164-0235(02)00059-6","DOIUrl":"10.1016/S1164-0235(02)00059-6","url":null,"abstract":"<div><p>This paper shows how the heat reclaimed from the exhaust gas of a gas turbine engine can be used to convert dilute ethyl alcohol (“beer”) to a fuel that can used to power the engine. Ordinarily, there is not enough heat available to distil the weak liquor to sufficient amounts of a strong product (&gt;90%), due to high exergy destruction. In this design, a combination of destructive distillation and ordinary distillation is used, the wet product then being sent to a reformer for an endothermic shift reaction. The high temperature gas is now ready to burn in a gas turbine engine (or high temperature fuel cell). Water in the low temperature stack gas can be reclaimed in a cooling tower, if desired, so as to have no net loss of water for the system. The exergetic (Second Law) efficiency for power production is nearly 50%.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 147-151"},"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)00059-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90693408","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
Exergy efficiency calculation of energy intensive systems 能源密集型系统的能源效率计算
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00042-5
V. Nikulshin , C. Wu , V. Nikulshina
{"title":"Exergy efficiency calculation of energy intensive systems","authors":"V. Nikulshin ,&nbsp;C. Wu ,&nbsp;V. Nikulshina","doi":"10.1016/S1164-0235(01)00042-5","DOIUrl":"10.1016/S1164-0235(01)00042-5","url":null,"abstract":"<div><p>An innovative method for the exergy efficiency calculation of a complex energy-intensive system with arbitrary structures is described in this paper. The method is based on a novel general equation to calculate the total system exergy efficiency, and on an exergy flow graph proposed by the authors. This approach allows a user to obtain not only the exergy efficiency of the total system, but also to show the relationship between the exergy efficiency of an individual element and that of the whole system. An example employing the method to the thermodynamic exergy analysis of a power plant is provided.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 2","pages":"Pages 78-86"},"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)00042-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86402192","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
The minimum work requirement for distillation processes 蒸馏过程的最低工作要求
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00036-X
Yunus Cerci
{"title":"The minimum work requirement for distillation processes","authors":"Yunus Cerci","doi":"10.1016/S1164-0235(01)00036-X","DOIUrl":"10.1016/S1164-0235(01)00036-X","url":null,"abstract":"<div><p>A typical ideal distillation process is proposed and analyzed using the first and second-laws of thermodynamics with particular attention to the minimum work requirement for individual processes. The distillation process consists of an evaporator, a condenser, a heat exchanger, and a number of heaters and coolers. Several Carnot engines are also employed to perform heat interactions of the distillation process with the surroundings and determine the minimum work requirement for processes. The Carnot engines give the maximum possible work output or the minimum work input associated with the processes, and therefore the net result of these inputs and outputs leads to the minimum work requirement for the entire distillation process. It is shown that the minimum work relation for the distillation process is the same as the minimum work input relation for an incomplete separation of incoming saline water, and depends only on the properties of the incoming saline water and the outgoing pure water and brine. Also, certain aspects of the minimum work relation found are discussed briefly.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 1","pages":"Pages 15-23"},"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)00036-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"111654653","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: 46
Entropy generation in transpiration cooling of concentric spherical shells 同心球壳蒸腾冷却中的熵生成
Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00032-2
Amro M Al-Qutub
{"title":"Entropy generation in transpiration cooling of concentric spherical shells","authors":"Amro M Al-Qutub","doi":"10.1016/S1164-0235(01)00032-2","DOIUrl":"10.1016/S1164-0235(01)00032-2","url":null,"abstract":"<div><p>The present paper deals with transpiration cooling of two concentric spherical shells. The analysis includes the calculation for the radial distribution of temperature and volumetric entropy generation, and the total rate of entropy generation in the thermal system. Standard air is considered as the cooling fluid. Results showed that the entropy generation increases with increasing temperature difference between the sphere surfaces. Variation of either mass flow rate or radius ratio affects volumetric entropy distribution and the total rate of entropy generation of the processes. The increase of mass flow rate or radius ratio increases the total rate of entropy generation. The performance of the system is analyzed by calculating irreversibility to heat transfer ratio at both inner and outer sphere surfaces. It was found that irreversibility to heat transfer ratio at the inner sphere surface increases with increasing mass flow rate, or decreasing radius ratio. The opposite is true for the outer sphere surface.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"1 4","pages":"Pages 303-309"},"PeriodicalIF":0.0,"publicationDate":"2001-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1164-0235(01)00032-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91404659","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
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