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    Analysis of Catalytically Enhanced Solar Absorption Chemical Reactors: Part II—Predicted Characteristics of a 100 kWchemical Reactor

    Source: Journal of Solar Energy Engineering:;1992:;volume( 114 ):;issue: 002::page 112
    Author:
    R. D. Skocypec
    ,
    R. E. Hogan
    DOI: 10.1115/1.2929988
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The CAtalytically Enhanced Solar Absorption Receiver (CAESAR) is a 100 kWchemecal test reactor currently in operation. This type of high-temperature chemical reactor volumetrically absorbs concentrated solar energy throughout a catalytic porous absorber matrix volume, promoting heterogeneous reactions with fluid-phase reactant species flowing through the absorber. A numerical model of these reactors has been developed to provide guidance in the catalytic matrix design for CAESAR. In the CAESAR reactor, methane is reformed using carbon dioxide and a rhodium catalyst. In addition, the model is being used to evaluate both the reactor performance and test data. This paper presents the thermal and chemical characteristics of the reactor for varying incident solar flux, fluid mass flow, convective heat-transfer coefficient, solar and infrared extinction coefficients, and catalyst loading. Predicted CAESAR performance is based on a prototype absorber and anticipated operating conditions. Model results suggest the mass flux must be proportioned to the incident solar flux radial distribution to prevent unacceptably high local temperatures and to provide a reactor having more uniform exit conditions. Either the catalytic loading or geometric thickness of the absorber should be increased for conversion to approach equilibrium levels. Also, the optical density of the matrix (particularly at the sunlit side of the reactor) should be decreased to distribute solar energy more uniformly in depth and decrease matrix temperatures at the front of the absorber.
    keyword(s): Absorption , Solar energy , Fluids , Catalysts , Temperature , Heat transfer , Density , Flow (Dynamics) , Equilibrium (Physics) , Engineering prototypes , Design , Methane , Thickness , High temperature , Computer simulation AND Carbon dioxide ,
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      Analysis of Catalytically Enhanced Solar Absorption Chemical Reactors: Part II—Predicted Characteristics of a 100 kWchemical Reactor

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/110837
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    • Journal of Solar Energy Engineering

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    contributor authorR. D. Skocypec
    contributor authorR. E. Hogan
    date accessioned2017-05-08T23:39:32Z
    date available2017-05-08T23:39:32Z
    date copyrightMay, 1992
    date issued1992
    identifier issn0199-6231
    identifier otherJSEEDO-28237#112_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/110837
    description abstractThe CAtalytically Enhanced Solar Absorption Receiver (CAESAR) is a 100 kWchemecal test reactor currently in operation. This type of high-temperature chemical reactor volumetrically absorbs concentrated solar energy throughout a catalytic porous absorber matrix volume, promoting heterogeneous reactions with fluid-phase reactant species flowing through the absorber. A numerical model of these reactors has been developed to provide guidance in the catalytic matrix design for CAESAR. In the CAESAR reactor, methane is reformed using carbon dioxide and a rhodium catalyst. In addition, the model is being used to evaluate both the reactor performance and test data. This paper presents the thermal and chemical characteristics of the reactor for varying incident solar flux, fluid mass flow, convective heat-transfer coefficient, solar and infrared extinction coefficients, and catalyst loading. Predicted CAESAR performance is based on a prototype absorber and anticipated operating conditions. Model results suggest the mass flux must be proportioned to the incident solar flux radial distribution to prevent unacceptably high local temperatures and to provide a reactor having more uniform exit conditions. Either the catalytic loading or geometric thickness of the absorber should be increased for conversion to approach equilibrium levels. Also, the optical density of the matrix (particularly at the sunlit side of the reactor) should be decreased to distribute solar energy more uniformly in depth and decrease matrix temperatures at the front of the absorber.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleAnalysis of Catalytically Enhanced Solar Absorption Chemical Reactors: Part II—Predicted Characteristics of a 100 kWchemical Reactor
    typeJournal Paper
    journal volume114
    journal issue2
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.2929988
    journal fristpage112
    journal lastpage118
    identifier eissn1528-8986
    keywordsAbsorption
    keywordsSolar energy
    keywordsFluids
    keywordsCatalysts
    keywordsTemperature
    keywordsHeat transfer
    keywordsDensity
    keywordsFlow (Dynamics)
    keywordsEquilibrium (Physics)
    keywordsEngineering prototypes
    keywordsDesign
    keywordsMethane
    keywordsThickness
    keywordsHigh temperature
    keywordsComputer simulation AND Carbon dioxide
    treeJournal of Solar Energy Engineering:;1992:;volume( 114 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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