高温不敏感的光谱选择性太阳能吸收材料
Spectrally Selective Solar Absorbers with High-temperature Insensitivity
摘要：
将光谱选择性技术应用于太阳能热工程，特别是在高温下，具有重要意义。这项工作演示了光谱选择性太阳能吸收器的多层钨，二氧化硅，氧化铝薄膜，是角度不敏感和偏振无关。在太阳辐射波长处的总吸收率为88.1%，在红外热波长处的低发射率为7.0%，以及高的太阳能热效率为79.9%。此外，其显示退火的样品在至少600 ℃的太阳辐射状态下保持极高的吸收，并且在800 ℃下热退火后的太阳能吸收器在CSP系统中仍然工作良好，甚至具有超过100的高聚集因子。
英文摘要：
It is of significance to incorporate spectral selectivity technology into solar thermal engineering, especially at high operational temperatures. This work demonstrates spectrally selective solar absorbers made of multilayer tungsten, silica, and alumina thin films that are angular insensitive and polarization-independent. An overall absorptance of 88.1% at solar irradiance wavelength, a low emittance of 7.0% at infrared thermal wavelength, and a high solar to heat efficiency of 79.9% are identified. Additionally, it shows the annealed samples maintain an extremely high absorption in solar radiation regime over at least 600 C and the solar absorbers after thermal annealing at 800 C still work well in a CSP system with an even high concentration factor of over 100.
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