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    Thermal Modeling of Solar Central Receiver Cavities

    Source: Journal of Solar Energy Engineering:;1989:;volume( 111 ):;issue: 002::page 117
    Author:
    R. D. Skocypec
    ,
    V. Romero
    DOI: 10.1115/1.3268296
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Results are presented from a numerical model of the steady-state energy transfer in molten-salt-in-tube solar cavity receivers that includes convective energy transfer at a local (spatially resolved) level. Molten salt energy absorption and gray radiative transfer between all cavity surfaces are also included. This model is applied to the Molten Salt Subsystem Component Test Experiment (MSS/CTE) cavity receiver. Results for this receiver indicate the global (entire cavity) receiver thermal efficiency is invariant within a few percent to most parameters investigated, although front surface temperatures of the nonabsorbing walls vary considerably, and are particularly sensitive to the type of convective submodel used. Absorption efficiencies indicate the effects of the cavity enclosure environment. For all conditions investigated, tube inner wall temperatures remain under 855 K, ensuring that the salt remains chemically stable. Global results for the receiver indicate thermal conditions in the receiver are temporally constant within an hour of solar noon, and solar panel temperatures are governed by the temperature of the flowing salt (the outlet temperature is maintained at 839 K by varying the salt mass flow rate). The dominant loss mechanism is radiative transfer, although convective loss predictions are of the same order of magnitude. The absorbing panel front surface temperatures and the panel thermal losses are somewhat invariant with incident flux. Losses from the nonabsorbing surfaces (comprising over 60 percent of the cavity surface area), however, do vary with incident flux levels. These results suggest that a correction for nonconstant losses in the Barron flux-on loss method is necessary. Global predictions compare well with data obtained in the MSS/CTE experiment. Predicted salt flow rates and absorbed powers were within one percent of values measured during steady-state tests. Predicted global loss values compare well with current loss estimates from measured data.
    keyword(s): Modeling , Solar energy , Cavities , Temperature , Energy transformation , Radiative heat transfer , Steady state , Flow (Dynamics) , Absorption , Wall temperature , Mechanisms AND Computer simulation ,
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      Thermal Modeling of Solar Central Receiver Cavities

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/105958
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    • Journal of Solar Energy Engineering

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    contributor authorR. D. Skocypec
    contributor authorV. Romero
    date accessioned2017-05-08T23:30:59Z
    date available2017-05-08T23:30:59Z
    date copyrightMay, 1989
    date issued1989
    identifier issn0199-6231
    identifier otherJSEEDO-28213#117_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/105958
    description abstractResults are presented from a numerical model of the steady-state energy transfer in molten-salt-in-tube solar cavity receivers that includes convective energy transfer at a local (spatially resolved) level. Molten salt energy absorption and gray radiative transfer between all cavity surfaces are also included. This model is applied to the Molten Salt Subsystem Component Test Experiment (MSS/CTE) cavity receiver. Results for this receiver indicate the global (entire cavity) receiver thermal efficiency is invariant within a few percent to most parameters investigated, although front surface temperatures of the nonabsorbing walls vary considerably, and are particularly sensitive to the type of convective submodel used. Absorption efficiencies indicate the effects of the cavity enclosure environment. For all conditions investigated, tube inner wall temperatures remain under 855 K, ensuring that the salt remains chemically stable. Global results for the receiver indicate thermal conditions in the receiver are temporally constant within an hour of solar noon, and solar panel temperatures are governed by the temperature of the flowing salt (the outlet temperature is maintained at 839 K by varying the salt mass flow rate). The dominant loss mechanism is radiative transfer, although convective loss predictions are of the same order of magnitude. The absorbing panel front surface temperatures and the panel thermal losses are somewhat invariant with incident flux. Losses from the nonabsorbing surfaces (comprising over 60 percent of the cavity surface area), however, do vary with incident flux levels. These results suggest that a correction for nonconstant losses in the Barron flux-on loss method is necessary. Global predictions compare well with data obtained in the MSS/CTE experiment. Predicted salt flow rates and absorbed powers were within one percent of values measured during steady-state tests. Predicted global loss values compare well with current loss estimates from measured data.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThermal Modeling of Solar Central Receiver Cavities
    typeJournal Paper
    journal volume111
    journal issue2
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.3268296
    journal fristpage117
    journal lastpage123
    identifier eissn1528-8986
    keywordsModeling
    keywordsSolar energy
    keywordsCavities
    keywordsTemperature
    keywordsEnergy transformation
    keywordsRadiative heat transfer
    keywordsSteady state
    keywordsFlow (Dynamics)
    keywordsAbsorption
    keywordsWall temperature
    keywordsMechanisms AND Computer simulation
    treeJournal of Solar Energy Engineering:;1989:;volume( 111 ):;issue: 002
    contenttypeFulltext
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