Exergy, An International Journal最新文献_第8页

Performance evaluation criteria for heat exchangers based on second law analysis 基于第二定律分析的换热器性能评价标准

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00034-6

M Yilmaz , O.N Sara , S Karsli

引用次数: 189

Exergy and industrial ecology. Part 2: A non-dimensional analysis of means to reduce resource depletion 能源与工业生态。第2部分:减少资源消耗手段的无量纲分析

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00033-4

Lloyd Connelly , Catherine P. Koshland

{"title":"Exergy and industrial ecology. Part 2: A non-dimensional analysis of means to reduce resource depletion","authors":"Lloyd Connelly , Catherine P. Koshland","doi":"10.1016/S1164-0235(01)00033-4","DOIUrl":"10.1016/S1164-0235(01)00033-4","url":null,"abstract":"<div><p>The thermodynamic interpretation of ecosystem evolution introduced in Part 1 of this series provides a basis for quantitative analysis of strategies for reducing resource depletion. In Part 2, we express resource depletion rate as a product of consumption rate and the Depletion number (<em>Dp</em>)—a non-dimensional indicator of depletion per unit consumption. We introduce two generalized models of resource use that incorporate a choice between virgin resource extraction and post-consumption resource recycling. These models are used as a basis for expressing <em>Dp</em> as a function of non-dimensional indicators for three resource conservation strategies: exergy cycling fraction (<em>ψ</em>) for resource recycling, exergy efficiency (<em>φ</em>) for process efficiency gains, and renewed exergy fraction (<span><math><mtext>Ω</mtext></math></span>) for extent of renewed resource use. We use the resulting expressions to fully characterize strategy interaction, strategy limitations, and the roles that these strategies play in allowing resource consumption to occur with decreasing levels of resource depletion. We also show how the derived framework may be incorporated into an economic analysis to identify least-cost approaches to depletion avoidance in a toluene production and cycling system.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"1 4","pages":"Pages 234-255"},"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)00033-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90956515","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

Exergoeconomic analysis of gas turbine cogeneration systems 燃气轮机热电联产系统的运行经济性分析

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00007-3

Yong-Ho Kwon , Ho-Young Kwak , Si-Doek Oh

引用次数: 125

Exergy as the confluence of energy, environment and sustainable development 能源是能源、环境和可持续发展的交汇点

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00004-8

Marc A Rosen , Ibrahim Dincer

{"title":"Exergy as the confluence of energy, environment and sustainable development","authors":"Marc A Rosen , Ibrahim Dincer","doi":"10.1016/S1164-0235(01)00004-8","DOIUrl":"10.1016/S1164-0235(01)00004-8","url":null,"abstract":"<div><p>The exergy of an energy form or a substance is a measure of its usefulness or quality or potential to cause change. A thorough understanding of exergy and the insights it can provide into the efficiency, environmental impact and sustainability of energy systems, are required for the engineer or scientist working in the area of energy systems and the environment. Further, as energy policies play an increasingly important role in addressing sustainability issues and a broad range of local, regional and global environmental concerns, policy makers also need to appreciate the exergy concept and its ties to these concerns. During the past decade, the need to understand the connections between exergy and energy, sustainable development and environmental impact has become increasingly significant. In this paper, a study of these connections is presented in order to provide to those involved in energy and environment studies, useful insights and direction for analyzing and solving environmental problems of varying complexity using the exergy concept. The results suggest that exergy provides the basis for an effective measure of the potential of a substance or energy form to impact the environment and appears to be a critical consideration in achieving sustainable development.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"1 1","pages":"Pages 3-13"},"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)00004-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90869612","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: 390

Beyond thermoeconomics? The concept of Extended Exergy Accounting and its application to the analysis and design of thermal systems 除了thermoeconomics吗?扩展火用会计的概念及其在热系统分析和设计中的应用

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00012-7

Enrico Sciubba

{"title":"Beyond thermoeconomics? The concept of Extended Exergy Accounting and its application to the analysis and design of thermal systems","authors":"Enrico Sciubba","doi":"10.1016/S1164-0235(01)00012-7","DOIUrl":"10.1016/S1164-0235(01)00012-7","url":null,"abstract":"<div><p>This paper presents a novel approach to the evaluation of energy conversion processes and systems, based on an <em>extended representation of their exergy flow diagram</em>. This approach is a systematic attempt to integrate into a unified coherent formalism both Cumulative Exergy Consumption and Thermo-economic methods, and constitutes a generalisation of both, in that its framework allows for a direct quantitative comparison of non-energetic quantities like <em>labour</em> and <em>environmental impact</em> (hence the apposition ‘Extended’). A critical examination of the existing state-of-the-art of energy- and exergy analysis methods and paradigms indicates that an extension of the existing ‘Design and Optimisation’ procedures to include explicitly ‘non-energetic externalities’ is indeed feasible. It appears that it can indeed be successfully argued that some of the issues that are difficult to address with a purely monetary theory of value can be resolved by Extended Exergy Accounting (‘EEA’ in the following) methods without introducing arbitrary assumptions external to the theory. In this respect, EEA can be regarded as a natural development of the economic theory of production of commodities, which it extends by properly accounting for the unavoidable energy dissipation in the productive chain. While a systematic description of the EEA theory is discussed in previous work by the same author, the present paper aims at a more specific target, and presents a formal representation of the application of EEA to a cogenerating plant based on a gas turbine process. It is shown that the solution indeed leads to an ‘optimal’ design, and that its formalism embeds even extended Thermo-economic formulations.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"1 2","pages":"Pages 68-84"},"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)00012-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90259453","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: 323

Thermodynamic optimization of geometry in engineering flow systems 工程流系统几何结构的热力学优化

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00028-0

Adrian Bejan

{"title":"Thermodynamic optimization of geometry in engineering flow systems","authors":"Adrian Bejan","doi":"10.1016/S1164-0235(01)00028-0","DOIUrl":"10.1016/S1164-0235(01)00028-0","url":null,"abstract":"<div><p>This review draws attention to an emerging body of work that relies on global thermodynamic optimization in the pursuit of flow system architecture. Exergy analysis establishes the theoretical performance limit. Thermodynamic optimization (or entropy generation minimization) brings the design as closely as permissible to the theoretical limit. The design is destined to remain imperfect because of constraints (finite sizes, times, and costs). Improvements are registered by spreading the imperfection (e.g., flow resistances) through the system. Resistances compete against each other and must be optimized together. Optimal spreading means spatial distribution, geometric form, topology, and geography. System architecture springs out of constrained global optimization. The principle is illustrated by simple examples: the optimization of dimensions, spacings, and the distribution (allocation) of heat transfer surface to the two heat exchangers of a power plant. Similar opportunities for deducing flow architecture exist in more complex systems for power and refrigeration. Examples show that the complete structure of heat exchangers for environmental control systems of aircraft can be derived based on this principle.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"1 4","pages":"Pages 269-277"},"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)00028-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83895999","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: 66

Message from the Honorary Editor 名誉编辑的话

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00002-4

Adrian Bejan

引用次数: 8

Effect of heat transfer law on the finite-time exergoeconomic performance of a Carnot refrigerator 传热规律对卡诺制冷机有限时间运行经济性的影响

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00031-0

Lingen Chen , Chih Wu , Fengrui Sun

{"title":"Effect of heat transfer law on the finite-time exergoeconomic performance of a Carnot refrigerator","authors":"Lingen Chen , Chih Wu , Fengrui Sun","doi":"10.1016/S1164-0235(01)00031-0","DOIUrl":"10.1016/S1164-0235(01)00031-0","url":null,"abstract":"<div><p>The operation of a Carnot refrigerator is viewed as a production process with exergy as its output. The economic optimization of the endoreversible refrigerator is carried out in this paper. The Coefficient of Performance (COP) of the refrigerator is a secondary consideration of the practical engineering effort of maximizing cooling rate and exergy whose goodness is constrained by economical considerations. Therefore, the profit of the refrigerator is taken as the optimization objective. Using the method of finite-time exergoeconomic analysis, which emphasizes the compromise optimization between economics (profit) and the appropriate energy utilization factor (Coefficient of Performance, COP) for finite-time (endoreversible) thermodynamic cycles, this paper derives the relation between optimal profit and COP of an endoreversible Carnot refrigerator based on a relatively general heat transfer law <em>q</em>∝<em>Δ</em>(<em>T</em><sup><em>n</em></sup>). The COP at the maximum profit is also obtained. The results obtained involve those for three common heat transfer laws: Newton's law (<em>n</em>=1), the linear phenomenological law in irreversible thermodynamics (<em>n</em>=−1), and the radiative heat transfer law (<em>n</em>=4).</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"1 4","pages":"Pages 295-302"},"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)00031-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83034902","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: 41

Finite-time thermodynamic analysis of a solar driven heat engine 太阳能热机的有限时间热力学分析

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00018-8

Ahmet Z Sahin

引用次数: 28

Optimization of the rate of exergy output of a multi-stage endoreversible combined refrigeration system 多级内可逆联合制冷系统火用输出速率的优化

Exergy, An International Journal Pub Date : 2001-01-01 DOI: 10.1016/S1164-0235(01)00015-2

Jincan Chen , Xueling Chen , Chih Wu

引用次数: 25