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Exergy, An International Journal最新文献

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Exergy efficiency evaluation of the production of sulfuric acid from liquid sulfur 液硫制硫酸的火用效率评价
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00038-3
D.A. Rasheva, L.G. Atanasova
{"title":"Exergy efficiency evaluation of the production of sulfuric acid from liquid sulfur","authors":"D.A. Rasheva,&nbsp;L.G. Atanasova","doi":"10.1016/S1164-0235(01)00038-3","DOIUrl":"10.1016/S1164-0235(01)00038-3","url":null,"abstract":"<div><p>Sulfuric acid is one of the most important products in inorganic synthesis. Half of the manufactured amount of sulfuric acid is used for the production of mineral fertilizers. In this paper, a technological scheme for the manufacture of sulfuric acid from liquid sulfur using double contacting with intermediate absorption is studied. The production method allows the increase of the degree of oxidation of sulfur dioxide up to 99.5%, and the decrease of its content in the waste gas. For evaluation of the exergy efficiency of the technological scheme investigated, one of the modern methods of thermodynamic analysis-exergy method is used. Exergy balance of the whole manufacture and its individual steps is done. Internal and external exergy losses, exergy efficiency are calculated. The overall exergy efficiency is 55.15%. The main sources for losses are determined, and the methods for minimizing losses are described.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 1","pages":"Pages 51-54"},"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)00038-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74760658","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
A comparative performance analysis of endoreversible dual cycle under maximum ecological function and maximum power conditions 内可逆双循环在最大生态功能和最大功率条件下的性能比较分析
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00071-7
Bahri Şahin , Osman Azmi Özsoysal , Oğuz Salim Söğüt
{"title":"A comparative performance analysis of endoreversible dual cycle under maximum ecological function and maximum power conditions","authors":"Bahri Şahin ,&nbsp;Osman Azmi Özsoysal ,&nbsp;Oğuz Salim Söğüt","doi":"10.1016/S1164-0235(02)00071-7","DOIUrl":"10.1016/S1164-0235(02)00071-7","url":null,"abstract":"<div><p>In this paper, a performance analysis and optimization based on the ecological criterion has been performed for an air-standard endoreversible internal combustion engine dual cycle coupled to constant temperature heat reservoirs. The ecological objective function, defined as the power output minus the loss rate of availability is taken as the optimization criterion. The optimal performances and design parameters, such as compression ratio, pressure ratio, cut-off ratio and NTU allocation ratio, which maximize the ecological objective function are investigated. The obtained results are compared with those of the maximum power performance criterion. Since the ecological optimization technique for a dual cycle consists of both power and entropy generation rate, the obtained results lead more realistic design from the point of view of preservation of natural resources.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 173-185"},"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)00071-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76823701","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: 30
Entropy generation and pumping power in a turbulent fluid flow through a smooth pipe subjected to constant heat flux 在恒定热通量下，紊流流经光滑管道时的熵的产生和泵送功率
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00082-1
Ahmet Z. Sahin
{"title":"Entropy generation and pumping power in a turbulent fluid flow through a smooth pipe subjected to constant heat flux","authors":"Ahmet Z. Sahin","doi":"10.1016/S1164-0235(02)00082-1","DOIUrl":"10.1016/S1164-0235(02)00082-1","url":null,"abstract":"<div><p>In a heat exchange process, heat transfer and pumping power requirements are the two main considerations. Efforts made to increase heat transfer in a fluid flow usually cause increase in the pumping power requirement. In an effort to avoid inefficient utilization of energy through excessive entropy generation, a thermodynamic analysis of turbulent fluid flow through a smooth duct subjected to constant heat flux has been made in this study. The temperature dependence of the viscosity was taken into consideration in determining the heat transfer coefficient and friction factor. It was shown that the viscosity variation has a considerable effect on both the entropy generation and the pumping power. Pumping power to heat transfer ratio and the entropy generation per unit heat transfer can become very large especially for low heat flux conditions.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 314-321"},"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)00082-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76946648","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: 63
Component efficiencies of a vapour-compression heat pump 蒸汽压缩热泵的组件效率
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00043-7
Jan Szargut
{"title":"Component efficiencies of a vapour-compression heat pump","authors":"Jan Szargut","doi":"10.1016/S1164-0235(01)00043-7","DOIUrl":"10.1016/S1164-0235(01)00043-7","url":null,"abstract":"<div><p>The reasons of the considerable decrease of <em>COP</em> of a real heat pump in comparison with the Carnot heat pump have been expressed by means of the component thermodynamic efficiencies which determine the influence of the particular irreversible processes on the coefficient of performance of the considered heat pump. The <em>COP</em> of the total installation is expressed as a product of component efficiencies. A very large deleterious impact of irreversible heat transfer processes is demonstrated. Component efficiencies indicate the possibilities of the improvement of the installation.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 2","pages":"Pages 99-104"},"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)00043-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86208865","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
Clarifying thermodynamic efficiencies and losses via exergy 通过火用澄清热力学效率和损失
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(01)00054-1
Marc A. Rosen
{"title":"Clarifying thermodynamic efficiencies and losses via exergy","authors":"Marc A. Rosen","doi":"10.1016/S1164-0235(01)00054-1","DOIUrl":"10.1016/S1164-0235(01)00054-1","url":null,"abstract":"<div><p>The author explains his views that we need to clarify better what we mean by the terms <em>efficiency</em> and <em>loss</em>, and utilize exergy-based—rather than energy-based—measures of these quantities in order to ensure that the measures are meaningful and useful.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 1","pages":"Pages 3-5"},"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)00054-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90294346","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: 52
Exergetic environmental assessment of life cycle emissions for various automobiles and fuels 各种汽车和燃料生命周期排放的烈性环境评价
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00076-6
Jason J. Daniel , Marc A. Rosen
{"title":"Exergetic environmental assessment of life cycle emissions for various automobiles and fuels","authors":"Jason J. Daniel ,&nbsp;Marc A. Rosen","doi":"10.1016/S1164-0235(02)00076-6","DOIUrl":"10.1016/S1164-0235(02)00076-6","url":null,"abstract":"<div><p>This paper examines material emissions produced during thirteen fuel life cycles for automobiles, on mass and exergy bases. The masses of fuel life cycle emissions are compared with the chemical exergies of these emissions. For the emissions data used, the chemical exergy results suggest that compressed natural gas use in motor vehicles produces emissions that are the most out of equilibrium with the natural environment, relative to all other fuel life cycle paths considered. It is also shown that diesel use in grid-independent hybrid electric vehicles has the lowest chemical exergies of emissions of all thirteen fuel-vehicle combinations under consideration, suggesting a lower degree of potential environmental impact. The exergy methodology presented for assessing the potential for environmental impact may help in the development and design of transportation technologies that are more environmentally benign than those presently used.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 283-294"},"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)00076-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77713468","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: 58
Optimal performance of an irreversible absorption refrigerator 不可逆吸收式制冷机的最佳性能
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00063-8
Lingen Chen , Ye Li , Fengrui Sun , Chih Wu
{"title":"Optimal performance of an irreversible absorption refrigerator","authors":"Lingen Chen ,&nbsp;Ye Li ,&nbsp;Fengrui Sun ,&nbsp;Chih Wu","doi":"10.1016/S1164-0235(02)00063-8","DOIUrl":"10.1016/S1164-0235(02)00063-8","url":null,"abstract":"<div><p>On the basis of endoreversible absorption refrigeration cycle model with the sole irreversibility of heat transfer between the working fluid and the heat reservoirs, an irreversible model of absorption refrigeration cycle with heat transfer law of <em>q</em>∝<em>Δ</em>(<em>T</em><sup>−1</sup>), which includes the heat leak from the heat sink to the cooled space and irreversibilities due to the internal dissipation of the working fluid besides the finite-rate heat transfer between the working fluid and the external heat reservoirs, is established and used to derive the relation between the optimal coefficient of performance and the cooling load and the optimal distribution of the heat-transfer surface areas of the heat exchangers. The practical optimal regions of the cycle are determined and new bounds of the primary performance parameters are given. A numerical example is provided to illustrate the performance characteristic of endoreversible and irreversible cycles.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 3","pages":"Pages 167-172"},"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)00063-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78840122","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: 23
Thermoeconomic design and analysis of a sensible-heat thermal energy storage system with Joulean heating of the storage element 蓄热元件采用焦耳加热的显热蓄热系统的热经济性设计与分析
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00074-2
Syed M. Zubair , Meamer El-Nakla , Shahzada Z. Shuja
{"title":"Thermoeconomic design and analysis of a sensible-heat thermal energy storage system with Joulean heating of the storage element","authors":"Syed M. Zubair ,&nbsp;Meamer El-Nakla ,&nbsp;Shahzada Z. Shuja","doi":"10.1016/S1164-0235(02)00074-2","DOIUrl":"10.1016/S1164-0235(02)00074-2","url":null,"abstract":"<div><p>A second-law-based thermoeconomic model of a sensible heat-storage system with Joulean heating is derived and discussed in which the storage element is cooled by flowing stream of gases. In this analysis, unit cost values are attached to the irreversible losses caused by the finite-temperature difference heat transfer and pressure drop during the heat removal process. Important dimensionless parameters are identified and the results are presented in terms of the optimum number of heat transfer units (<em>NTU</em><sub>opt</sub>) as a function of the dimensionless unit cost per unit heat conductance (<em>γ</em><sub><em>UA</em></sub>) and dimensionless temperature difference (<em>τ</em>) of the storage systems. The storage systems studied are optimized by introducing a new performance criterion described as the <em>cost rate number</em> <span><math><mtext>(Γ</mtext><msup><mi></mi><mn>∗</mn></msup><mtext>)</mtext></math></span>. Performance results of low- and high-temperature storage systems are also examined and the results are compared with that obtained from Krane's analysis to illustrate the usefulness of the present approach. The influence of important unit cost parameters on <em>NTU</em><sub>opt</sub> and <span><math><mtext>Γ</mtext><msub><mi></mi><mn><mtext>opt</mtext></mn></msub><msup><mi></mi><mn>∗</mn></msup></math></span> are also studied in somewhat more detail.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 237-247"},"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)00074-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88671333","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
Exergetic pollution potential: Estimating the revocability of chemical pollution 火用污染势:化学污染可撤销性的估计
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00066-3
Thomas P. Seager , Thomas L. Theis
{"title":"Exergetic pollution potential: Estimating the revocability of chemical pollution","authors":"Thomas P. Seager ,&nbsp;Thomas L. Theis","doi":"10.1016/S1164-0235(02)00066-3","DOIUrl":"10.1016/S1164-0235(02)00066-3","url":null,"abstract":"<div><p>The waste exergy approach to quantitative comparison of environmental impacts is considerably improved by proposing a separate accounting of material and energetic waste exergy and the implications are discussed within the context of sustainability. The exergy of mixing of a waste stream is found to be particularly well suited to an exergetic definition of chemical pollution and a correlative relationship with environmental pollutant cost (EPC) is suggested. A comprehensive measure of chemical environmental impact called <em>pollution potential</em> is defined as temperature multiplied by the change in configurational entropy per mole of pollutant in the environment. The result is related to the ideal thermodynamic work of chemical separation per mole required to instantaneously revoke a chemical pollutant, thereby returning the environment to a pristine reference condition. The current pollution potentials and total exergy of revocation of several notable atmospheric pollutants are estimated. Carbon dioxide is found to have low pollution potential in comparison to most halogenated hydrocarbons, but the vast quantities of anthropogenic carbon dioxide in the atmosphere would require much more total exergy of separation to revoke.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 273-282"},"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)00066-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88307739","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: 27
Does industry embrace exergy? 工业拥抱能源吗?
Exergy, An International Journal Pub Date : 2002-01-01 DOI: 10.1016/S1164-0235(02)00087-0
Marc A. Rosen (Associate Editor)
{"title":"Does industry embrace exergy?","authors":"Marc A. Rosen (Associate Editor)","doi":"10.1016/S1164-0235(02)00087-0","DOIUrl":"10.1016/S1164-0235(02)00087-0","url":null,"abstract":"<div><p>The author explains his views that industry, the part of society to which exergy methods seem most directed, can benefit greatly by using exergy for design, efficiency improvement and related activities, but that industry needs to be helped in overcoming barriers to the successful utilization of exergy methods.</p></div>","PeriodicalId":100518,"journal":{"name":"Exergy, An International Journal","volume":"2 4","pages":"Pages 221-223"},"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)00087-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73902453","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: 37
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