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Spectral Radiative Properties of Ceramic Particles for Concentrated Solar Thermal Energy Storage Applications
International Journal of Thermophysics ( IF 2.2 ) Pub Date : 2020-09-02 , DOI: 10.1007/s10765-020-02733-5 Chuyang Chen , Chiyu Yang , Devesh Ranjan , Peter G. Loutzenhiser , Zhuomin M. Zhang
International Journal of Thermophysics ( IF 2.2 ) Pub Date : 2020-09-02 , DOI: 10.1007/s10765-020-02733-5 Chuyang Chen , Chiyu Yang , Devesh Ranjan , Peter G. Loutzenhiser , Zhuomin M. Zhang
This work investigates the spectral radiative properties of ceramic particles using a monochromator and a Fourier-transform infrared spectrometer (FTIR) with integrating spheres at wavelengths from 0.38 μm to 15 μm. Particles are encased between two transparent windows to obtain the directional-hemispherical reflectance of the particle bed. Two types of commercially available particles with three different sizes are examined. Integration over the solar spectrum reveals that the solar absorptance of the particle beds is between 0.940 and 0.957. The total emittance at 1000 K is also estimated by assuming the spectral emittance is independent of temperature. The optical constants of particles are modeled with effective medium approaches, considering the optical properties of individual constituent materials. The absorptance of the particle is estimated using the effective optical constants and compared with that of the particle bed from the measurement. This work facilitates the characterization of radiative properties of particles with a windowed method and provides a modeling scheme for approximating the radiative properties of composite ceramic materials.
中文翻译:
聚光太阳能储能应用中陶瓷颗粒的光谱辐射特性
这项工作使用单色仪和具有积分球的傅立叶变换红外光谱仪(FTIR)研究了陶瓷颗粒的光谱辐射特性,该积分球的波长为0.38μm至15μm。将粒子包裹在两个透明窗口之间,以获得粒子床的方向性半球反射率。研究了两种具有三种不同尺寸的市售颗粒。太阳光谱上的积分表明,粒子床的太阳吸收率在0.940至0.957之间。还通过假设光谱发射率与温度无关来估算1000 K时的总发射率。考虑到各个组成材料的光学特性,使用有效的介质方法对粒子的光学常数进行建模。使用有效的光学常数来估算颗粒的吸收率,并将其与测量的颗粒床的吸收率进行比较。这项工作有助于通过开窗方法表征颗粒的辐射特性,并提供了一种用于近似复合陶瓷材料辐射特性的建模方案。
更新日期:2020-09-02
中文翻译:
聚光太阳能储能应用中陶瓷颗粒的光谱辐射特性
这项工作使用单色仪和具有积分球的傅立叶变换红外光谱仪(FTIR)研究了陶瓷颗粒的光谱辐射特性,该积分球的波长为0.38μm至15μm。将粒子包裹在两个透明窗口之间,以获得粒子床的方向性半球反射率。研究了两种具有三种不同尺寸的市售颗粒。太阳光谱上的积分表明,粒子床的太阳吸收率在0.940至0.957之间。还通过假设光谱发射率与温度无关来估算1000 K时的总发射率。考虑到各个组成材料的光学特性,使用有效的介质方法对粒子的光学常数进行建模。使用有效的光学常数来估算颗粒的吸收率,并将其与测量的颗粒床的吸收率进行比较。这项工作有助于通过开窗方法表征颗粒的辐射特性,并提供了一种用于近似复合陶瓷材料辐射特性的建模方案。