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    Thermal Performances of a High Temperature Air Solar Absorber Based on Compact Heat Exchange Technology

    Source: Journal of Solar Energy Engineering:;2011:;volume( 133 ):;issue: 003::page 31004
    Author:
    B. Grange
    ,
    A. Ferrière
    ,
    D. Bellard
    ,
    M. Vrinat
    ,
    R. Couturier
    ,
    Y. Fan
    ,
    F. Pra
    DOI: 10.1115/1.4004356
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In the framework of the French PEGASE project (Production of Electricity by GAs turbine and Solar Energy), CNRS/PROMES laboratory is developing a 4 MWth pressurized air solar receiver with a surface absorber based on a compact heat exchanger technology. The first step of this development consists in designing and testing a pilot scale (1/10 scale, e.g., 360 kWth) solar receiver based on a metallic surface absorber. This paper briefly presents the hydraulic and thermal performances of the innovative pressurized air solar absorber developed in a previous work. The goal is to be capable of preheating pressurized air from 350 °C at the inlet to 750 °C at the outlet, with a maximum pressure drop of 300 mbar. The receiver is a cavity of square aperture 120 cm × 120 cm and 1 m deepness with an average concentration in the aperture of more than 300. The square shaped aperture is chosen due to the small scale of the receiver; indeed, the performances are not enhanced that much with a round aperture, while the manufacturability is much more complicated. However in the perspective of PEGASE, a round aperture is likely to be used. The back of the cavity is covered by modules arranged in two series making the modular and multistage absorber. The thermal performances of one module are considered to simulate the thermal exchange within the receiver and to estimate the energy efficiency of this receiver. The results of the simulation show that the basic design yields an air outlet temperature of 739 °C under design operation conditions (1000 W/m2 solar irradiation, 0.8 kg/s air flow rate). Using the cavity walls as air preheating elements allows increasing the air outlet temperature above 750 °C as well as the energy efficiency up to 81% but at the cost of a critical absorber wall temperature. However, this wall temperature can be controlled by applying an aiming point strategy with the heliostat field.
    keyword(s): Heat , Temperature , Solar energy , Cavities , Wall temperature , Pressure drop , High temperature AND Cavity walls ,
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      Thermal Performances of a High Temperature Air Solar Absorber Based on Compact Heat Exchange Technology

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    http://yetl.yabesh.ir/yetl1/handle/yetl/147550
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    • Journal of Solar Energy Engineering

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    contributor authorB. Grange
    contributor authorA. Ferrière
    contributor authorD. Bellard
    contributor authorM. Vrinat
    contributor authorR. Couturier
    contributor authorY. Fan
    contributor authorF. Pra
    date accessioned2017-05-09T00:46:47Z
    date available2017-05-09T00:46:47Z
    date copyrightAugust, 2011
    date issued2011
    identifier issn0199-6231
    identifier otherJSEEDO-28444#031004_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/147550
    description abstractIn the framework of the French PEGASE project (Production of Electricity by GAs turbine and Solar Energy), CNRS/PROMES laboratory is developing a 4 MWth pressurized air solar receiver with a surface absorber based on a compact heat exchanger technology. The first step of this development consists in designing and testing a pilot scale (1/10 scale, e.g., 360 kWth) solar receiver based on a metallic surface absorber. This paper briefly presents the hydraulic and thermal performances of the innovative pressurized air solar absorber developed in a previous work. The goal is to be capable of preheating pressurized air from 350 °C at the inlet to 750 °C at the outlet, with a maximum pressure drop of 300 mbar. The receiver is a cavity of square aperture 120 cm × 120 cm and 1 m deepness with an average concentration in the aperture of more than 300. The square shaped aperture is chosen due to the small scale of the receiver; indeed, the performances are not enhanced that much with a round aperture, while the manufacturability is much more complicated. However in the perspective of PEGASE, a round aperture is likely to be used. The back of the cavity is covered by modules arranged in two series making the modular and multistage absorber. The thermal performances of one module are considered to simulate the thermal exchange within the receiver and to estimate the energy efficiency of this receiver. The results of the simulation show that the basic design yields an air outlet temperature of 739 °C under design operation conditions (1000 W/m2 solar irradiation, 0.8 kg/s air flow rate). Using the cavity walls as air preheating elements allows increasing the air outlet temperature above 750 °C as well as the energy efficiency up to 81% but at the cost of a critical absorber wall temperature. However, this wall temperature can be controlled by applying an aiming point strategy with the heliostat field.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleThermal Performances of a High Temperature Air Solar Absorber Based on Compact Heat Exchange Technology
    typeJournal Paper
    journal volume133
    journal issue3
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.4004356
    journal fristpage31004
    identifier eissn1528-8986
    keywordsHeat
    keywordsTemperature
    keywordsSolar energy
    keywordsCavities
    keywordsWall temperature
    keywordsPressure drop
    keywordsHigh temperature AND Cavity walls
    treeJournal of Solar Energy Engineering:;2011:;volume( 133 ):;issue: 003
    contenttypeFulltext
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