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    Beam-Down Mirror: Thermal and Stress Analyses

    Source: Journal of Solar Energy Engineering:;2009:;volume( 131 ):;issue: 004::page 41003
    Author:
    Rami Ben-Zvi
    ,
    Akiba Segal
    ,
    Michael Epstein
    DOI: 10.1115/1.3197536
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: The “beam-down” optics or solar tower reflector, developed and demonstrated at the Weizmann Institute of Science during the past 9 years, could be a useful modification of the classic solar tower technology, especially for solar applications where reacting solids are involved or heavy equipment has to be placed on top of a conventional tower. The theory of this optics has been thoroughly studied and reported elsewhere. This paper details the development and experience gained with the mirror facets of the tower reflector. Thermal and stress analyses are presented here, validated by temperature measurements and calculated incident flux map. The projection for a large scale solar plant of about 100 MW at the aperture of the receiver is illustrated. The current basic design of the facet made of a sandwich of mirrors glued back-to-back seems to be a feasible solution for future applications. Aluminum-glass facets failed, and cracks in the glass were observed in the course of time. Years of experience proved that using only natural cooling to the surrounding, for the glass/glass facets, which can reach 130–140°C during operation under average incident solar flux of about 30 kW/m2, is a viable design. Maximum working temperatures of 160°C were experienced without any degradation of the reflectivity and the performance of these facets after several hundreds of operation hours.
    keyword(s): Temperature , Metals , Glass , Mirrors , Solar energy , Thermal stresses , Stress , Convection AND Silver ,
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      Beam-Down Mirror: Thermal and Stress Analyses

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    http://yetl.yabesh.ir/yetl1/handle/yetl/141891
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    contributor authorRami Ben-Zvi
    contributor authorAkiba Segal
    contributor authorMichael Epstein
    date accessioned2017-05-09T00:35:16Z
    date available2017-05-09T00:35:16Z
    date copyrightNovember, 2009
    date issued2009
    identifier issn0199-6231
    identifier otherJSEEDO-28424#041003_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/141891
    description abstractThe “beam-down” optics or solar tower reflector, developed and demonstrated at the Weizmann Institute of Science during the past 9 years, could be a useful modification of the classic solar tower technology, especially for solar applications where reacting solids are involved or heavy equipment has to be placed on top of a conventional tower. The theory of this optics has been thoroughly studied and reported elsewhere. This paper details the development and experience gained with the mirror facets of the tower reflector. Thermal and stress analyses are presented here, validated by temperature measurements and calculated incident flux map. The projection for a large scale solar plant of about 100 MW at the aperture of the receiver is illustrated. The current basic design of the facet made of a sandwich of mirrors glued back-to-back seems to be a feasible solution for future applications. Aluminum-glass facets failed, and cracks in the glass were observed in the course of time. Years of experience proved that using only natural cooling to the surrounding, for the glass/glass facets, which can reach 130–140°C during operation under average incident solar flux of about 30 kW/m2, is a viable design. Maximum working temperatures of 160°C were experienced without any degradation of the reflectivity and the performance of these facets after several hundreds of operation hours.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleBeam-Down Mirror: Thermal and Stress Analyses
    typeJournal Paper
    journal volume131
    journal issue4
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.3197536
    journal fristpage41003
    identifier eissn1528-8986
    keywordsTemperature
    keywordsMetals
    keywordsGlass
    keywordsMirrors
    keywordsSolar energy
    keywordsThermal stresses
    keywordsStress
    keywordsConvection AND Silver
    treeJournal of Solar Energy Engineering:;2009:;volume( 131 ):;issue: 004
    contenttypeFulltext
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