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    The Impact of the Model of the Environment in Exergy Analyses

    Source: Journal of Energy Resources Technology:;1999:;volume( 121 ):;issue: 004::page 268
    Author:
    J. R. Muñoz
    ,
    E. E. Michaelides
    DOI: 10.1115/1.2795993
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The values of absolute exergy and exergetic efficiency depend on the assumed values of the “reference states,” which are essentially a model of the environment of the processes and components considered. The environmental model plays an important role in any optimization process that uses any form of exergy-based analysis. This paper examines the influence of eleven previously proposed models for the environment on the absolute values of the exergy and on the exergetic efficiencies, associated with the operation of three different power plants: a methane cogeneration plant, a coal-fired plant, and a dual-flash geothermal power plant. It is observed that although there are some common characteristics in most of the values obtained from all the models, the absolute exergies and exergetic efficiencies calculated using some of these models deviate substantially from those obtained with the others. The reasons for these deviations are also examined here.
    keyword(s): Exergy , Coal , Optimization , Power stations , Combined heat and power , Exergy analysis , Industrial plants , Methane AND Geothermal power stations ,
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      The Impact of the Model of the Environment in Exergy Analyses

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    http://yetl.yabesh.ir/yetl1/handle/yetl/122033
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    contributor authorJ. R. Muñoz
    contributor authorE. E. Michaelides
    date accessioned2017-05-08T23:59:24Z
    date available2017-05-08T23:59:24Z
    date copyrightDecember, 1999
    date issued1999
    identifier issn0195-0738
    identifier otherJERTD2-26486#268_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/122033
    description abstractThe values of absolute exergy and exergetic efficiency depend on the assumed values of the “reference states,” which are essentially a model of the environment of the processes and components considered. The environmental model plays an important role in any optimization process that uses any form of exergy-based analysis. This paper examines the influence of eleven previously proposed models for the environment on the absolute values of the exergy and on the exergetic efficiencies, associated with the operation of three different power plants: a methane cogeneration plant, a coal-fired plant, and a dual-flash geothermal power plant. It is observed that although there are some common characteristics in most of the values obtained from all the models, the absolute exergies and exergetic efficiencies calculated using some of these models deviate substantially from those obtained with the others. The reasons for these deviations are also examined here.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThe Impact of the Model of the Environment in Exergy Analyses
    typeJournal Paper
    journal volume121
    journal issue4
    journal titleJournal of Energy Resources Technology
    identifier doi10.1115/1.2795993
    journal fristpage268
    journal lastpage276
    identifier eissn1528-8994
    keywordsExergy
    keywordsCoal
    keywordsOptimization
    keywordsPower stations
    keywordsCombined heat and power
    keywordsExergy analysis
    keywordsIndustrial plants
    keywordsMethane AND Geothermal power stations
    treeJournal of Energy Resources Technology:;1999:;volume( 121 ):;issue: 004
    contenttypeFulltext
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