Tungsten oxides (WO x ) films have gained promising attention in terms of selective solar absorption due to its high intrinsic absorption properties. We fabricated a series of single-layer WO x films on aluminum substrates by a magnetron sputtering system.The optical absorption properties of the film were investigated by spectrophotometer and ellipsometry. We found that the optical properties of the film were very sensitive to the change of the thickness. The result showed the highest α value can reach up 0.82 with the thickness of 26 nm at 0.6 Pa or 70 nm at 1.5 Pa, and both ε values was around 0.05, indicating the high spectral selectivity properties. The different reflectance evolutions presented a wide range of color appearances, such as yellow, reddish, cyan, and blue. Moreover, the surface morphologies and phase structures of single-layer WO x films were investigated by SEM, XRD, and Raman. A WO x /SiO 2 solar selective absorber coating indicated that the as-obtained WO x film was a promising application in solar-thermal conversion.
K E Y W O R D Ssolar selective absorber coating, spectral properties, tungsten oxides, chromaticity
Aiming at the tracking error of the primary mirror in the Linear Fresnel concentrated light and heat field, according to the structural characteristics of the Linear Fresnel concentrating and heat collecting system, the analysis model of the system concentrating error is established. By analyzing the mirror shape error of the Linear Fresnel system, the installation error of the secondary mirror (CPC), the errors of the north-south layout of the mirror field, the deviation of the primary mirror rotation axis and the deviation of the temperature drift of the angle sensor, and the factors were calculated by MATLAB simulation. The concentrating error factors affecting the Linear Fresnel concentrating and heat collecting system are analyzed quantitatively. From the simulation results: during the whole day, the influence of the north-south layout deviation of the mirror field and the deviation of the primary mirror rotation axis on the tracking accuracy is time-varying, and the influence is greater in the midday period. During the whole year, the influence factors of the north-south deviation of the mirror field and the temperature drift of the angle sensor on the tracking accuracy are incident, and the influence is greater in winter and less in summer. The installation error of CPC has a constant influence on the tracking accuracy.
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