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    Infrared-Reflective Coating on Fused Silica for a Solar High-Temperature Receiver

    Source: Journal of Solar Energy Engineering:;2009:;volume( 131 ):;issue: 002::page 21004
    Author:
    Marc Röger
    ,
    Christoph Rickers
    ,
    Ralf Uhlig
    ,
    Frank Neumann
    ,
    Christina Polenzky
    DOI: 10.1115/1.3097270
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: In concentrating solar power, high-temperature solar receivers can provide heat to highly efficient cycles for electricity or chemical production. Excessive heating of the fused-silica window and the resulting recrystallization are major problems of high-temperature receivers using windows. Excessive window temperatures can be avoided by applying an infrared-reflective solar-transparent coating on the fused-silica window inside. Both glass temperatures and receiver losses can be reduced. An ideal coating reflects part of the thermal spectrum (λ>2.5 μm) of the hot absorber (1100°C) back onto it without reducing solar transmittance. Extensive radiation simulations were done to screen different filter types. The examined transparent conductive oxides involve a high solar absorptance, inhibiting their use in high-concentration solar systems. Although conventional dielectric interference filters have a low solar absorption, the reflection of solar radiation, which comes from various directions, is too high. It was found that only rugate filters fulfill the requirements for operation under high-flux solar radiation with different incident angles. A thermodynamic qualification simulation of the rugate coating on a window of a flat-plate receiver showed a reduction of almost 175 K in mean window temperature and 11% in receiver losses compared with an uncoated window. For the configuration of a pressurized receiver (REFOS type), the temperature could be reduced by 65 K with slightly reduced receiver losses. Finally, a 25 μm thick rugate filter was manufactured and optically characterized. The measured spectra fitted approximately the design spectra, except for two absorption peaks, which can be avoided in future depositions by changing the deposition geometry and by using in situ monitoring. The issue of this paper is to share the work done on the choice of filter type, filter design, thermodynamic evaluation, and deposition experiments.
    keyword(s): Coating processes , Solar energy , Filters , Temperature , Coatings AND High temperature ,
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      Infrared-Reflective Coating on Fused Silica for a Solar High-Temperature Receiver

    URI
    http://yetl.yabesh.ir/yetl1/handle/yetl/141931
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    • Journal of Solar Energy Engineering

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    contributor authorMarc Röger
    contributor authorChristoph Rickers
    contributor authorRalf Uhlig
    contributor authorFrank Neumann
    contributor authorChristina Polenzky
    date accessioned2017-05-09T00:35:20Z
    date available2017-05-09T00:35:20Z
    date copyrightMay, 2009
    date issued2009
    identifier issn0199-6231
    identifier otherJSEEDO-28419#021004_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/141931
    description abstractIn concentrating solar power, high-temperature solar receivers can provide heat to highly efficient cycles for electricity or chemical production. Excessive heating of the fused-silica window and the resulting recrystallization are major problems of high-temperature receivers using windows. Excessive window temperatures can be avoided by applying an infrared-reflective solar-transparent coating on the fused-silica window inside. Both glass temperatures and receiver losses can be reduced. An ideal coating reflects part of the thermal spectrum (λ>2.5 μm) of the hot absorber (1100°C) back onto it without reducing solar transmittance. Extensive radiation simulations were done to screen different filter types. The examined transparent conductive oxides involve a high solar absorptance, inhibiting their use in high-concentration solar systems. Although conventional dielectric interference filters have a low solar absorption, the reflection of solar radiation, which comes from various directions, is too high. It was found that only rugate filters fulfill the requirements for operation under high-flux solar radiation with different incident angles. A thermodynamic qualification simulation of the rugate coating on a window of a flat-plate receiver showed a reduction of almost 175 K in mean window temperature and 11% in receiver losses compared with an uncoated window. For the configuration of a pressurized receiver (REFOS type), the temperature could be reduced by 65 K with slightly reduced receiver losses. Finally, a 25 μm thick rugate filter was manufactured and optically characterized. The measured spectra fitted approximately the design spectra, except for two absorption peaks, which can be avoided in future depositions by changing the deposition geometry and by using in situ monitoring. The issue of this paper is to share the work done on the choice of filter type, filter design, thermodynamic evaluation, and deposition experiments.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleInfrared-Reflective Coating on Fused Silica for a Solar High-Temperature Receiver
    typeJournal Paper
    journal volume131
    journal issue2
    journal titleJournal of Solar Energy Engineering
    identifier doi10.1115/1.3097270
    journal fristpage21004
    identifier eissn1528-8986
    keywordsCoating processes
    keywordsSolar energy
    keywordsFilters
    keywordsTemperature
    keywordsCoatings AND High temperature
    treeJournal of Solar Energy Engineering:;2009:;volume( 131 ):;issue: 002
    contenttypeFulltext
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    DSpace software copyright © 2002-2015  DuraSpace
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