热发射率
功勋
热的
材料科学
吸收率
光学
选择性表面
光电子学
热效率
反射率
物理
化学
热力学
燃烧
梁(结构)
有机化学
作者
Simon Caron,Jorge Garrido,Jesús Ballestrín,Florian Sutter,Marc Röger,Francisco Manzano‐Agugliaro
标识
DOI:10.1016/j.rser.2021.111818
摘要
Solar thermal absorber coatings play a key role in the thermal efficiency of receivers for applications in the field of Concentrated Solar Power (CSP). The development of stable spectral selective coatings with a high solar absorptance αsol and a low thermal emittance εth is often desired to reduce thermal losses. However, quantitative indicators describing selectivity and the trade-off between solar absorptance and thermal emittance is seldom discussed in the literature. In this review, relevant opto-thermal figures of merit are analyzed for the comparison of reference solar thermal absorber coatings, including real and ideal coatings, both black and spectral selective. The comparison is made for a temperature ranging from 25 to 1000 °C and for a concentration factor ranging from 20 to 1000, based on spectral data measured at room temperature from 0.25 to 20 μm. New figures of merit are introduced, i.e. a normalized selectivity ratio Si*, a trade-off factor Ztrade-off, a normalized solar reflectance index SRI* and a peak efficiency temperature Tpeak,opt. These metrics are derived from existing figures of merit and adapted for CSP. The set of figures of merit analyzed in this review offer a complementary perspective for the detailed characterization of any coating opto-thermal performance. For solar thermal absorber coatings, thermal efficiency ηthermal and peak efficiency temperature Tpeak,opt are respectively deemed more insightful than opto-thermal efficiency ηopt-th and maximum steady-state temperature TSST,max, when comparing the relative opto-thermal performance of two coating formulations.
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