He Song, Zhang Yanmei, Yang Wansheng, Wang Zhangyuan, Zhao Xudong, Wang Pingnuo
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, China.
School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China.
Materials (Basel). 2019 Jul 22;12(14):2329. doi: 10.3390/ma12142329.
In order to improve the absorption performance of the aluminum sheet for solar application, the nanoporous alumina sheets with the pore diameters of 30 nm and 400 nm were prepared by the anodic oxidation method. The absorption properties of the nanoporous alumina sheets under different solar radiation intensity were studied and compared with the conventional polished aluminum sheet. The results showed that the average absorptivity of the aluminum sheets decreased with the increase of the radiation intensity. When the radiation intensity was 100 W/m, the nanoporous alumina sheet with the 30 nm pore diameter had the highest average solar absorptivity of 0.39, which was 18% higher than that of the nanoporous alumina sheet with 400 nm pore diameter, and 50% higher than that of the polished aluminum sheet. The maximum instantaneous absorption efficiency of the nanoporous alumina sheet with 30 nm pore diameter was found at 0.92 when the radiation intensity was 100 W/m. The testing results indicated that the nanoporous alumina sheet with the 30 nm pore diameter performed the best compared with the other two aluminum sheets. By error propagation analysis, the relative error of the average amount of heat absorption and the average absorptivity were acceptable.
为了提高太阳能应用中铝板的吸收性能，采用阳极氧化法制备了孔径为30nm和400nm的纳米多孔氧化铝板。研究了纳米多孔氧化铝板在不同太阳辐射强度下的吸收特性，并与传统抛光铝板进行了比较。结果表明，铝板的平均吸收率随辐射强度的增加而降低。当辐射强度为100W/m时，孔径为30nm的纳米多孔氧化铝板的平均太阳吸收率最高，为0.39，比孔径为400nm的纳米多孔氧化铝板高18%，比抛光铝板高50%。当辐射强度为100W/m时，孔径为30nm的纳米多孔氧化铝板的最大瞬时吸收效率为0.92。测试结果表明，孔径为30nm的纳米多孔氧化铝板与其他两种铝板相比性能最佳。通过误差传播分析，平均吸热量和平均吸收率的相对误差是可以接受的。
