Analysis of High-Efficiency Mo-Based Solar Selective Absorber by Admittance Locus Method

High absorptivity and low emissivity are characteristics needed in an ideal solar selective absorber. In high-temperature applications, such as a solar concentration power system in which the solar surface works under a long-term high temperature (about 400 to 800 °C), the absorber material has to m...

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Bibliographic Details
Published in:Coatings (Basel) 2019-04, Vol.9 (4), p.256
Main Authors: Chen, Hung-Pin, Lee, Chao-Te, Liao, Wei-Bo, Chang, Ya-Chen, Chen, Yu-Sheng, Li, Meng-Chi, Lee, Cheng-Chung, Kuo, Chien-Cheng
Format: Article
Language:English
Subjects:
Absorbers (materials)
Absorption spectra
Absorptivity
Alternative energy sources
Efficiency
Electrical impedance
Emissivity
High temperature
Loci
Magnetron sputtering
Metals
Molybdenum
Radiation
Reflectance
Refractivity
Selectivity
Solar energy
Solar surface
Thermal stability
Thin films
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Summary:High absorptivity and low emissivity are characteristics needed in an ideal solar selective absorber. In high-temperature applications, such as a solar concentration power system in which the solar surface works under a long-term high temperature (about 400 to 800 °C), the absorber material has to maintain high absorption in the visible region, high reflectance in the infrared region, and excellent thermal stability at high temperature. In this research, the design of a molybdenum-based (Mo-based) solar selective absorber was analyzed by the admittance locus method, and the films were deposited by magnetron sputtering. The ratio of the extinction coefficient to the refractive index of the Mo layer was close to 1, so that the Mo-based solar selective absorber had a broad absorption band, high absorption, and good solar selectivity. Its average reflectance in the visible region was less than 0.4%. The experimental absorption was 97.1% (simulated absorption was 98%) and the emissivity was from 13% to 20% (simulated emissivity was 8% to 26%) as the temperature increased from 400 to 800 °C.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings9040256