研究了一种基于超材料的光学太阳反射镜(optical solar reflector,OSR),其由掺铝氧化锌(AZO)超表面、MgF2介质层和Ag金属反射层三层结构组成。在热红外AZO超表面激发表面等离激元共振增强电磁吸收,MgF2介质层介电常数的稳定性减少了吸...研究了一种基于超材料的光学太阳反射镜(optical solar reflector,OSR),其由掺铝氧化锌(AZO)超表面、MgF2介质层和Ag金属反射层三层结构组成。在热红外AZO超表面激发表面等离激元共振增强电磁吸收,MgF2介质层介电常数的稳定性减少了吸收振荡带来的反射,在可见光照射下AZO超表面和MgF2介质层的透明特性可降低太阳辐射损耗,Ag金属反射层可有效抑制透射。仿真结果表明,优化后的OSR在0.3~2.5μm内有17.6%的低太阳吸收率,在2.5~30.0μm内有86.5%的高红外发射率。此外,偏振和入射角度对其性能影响较小。该结构在红外波段实现了较好的吸收,在红外热成像、辐射制冷等领域也具有潜在应用价值。展开更多
采用激光切割方法对OSR(Optical Solar Reflector)片的制造工艺进行了试验研究,分析了激光切割OSR片的可行性及切割参数对加工质量的影响因素,通过试验数据的理论分析,建立了OSR片激光切割的数学模型,得到了切割宽度与切割功率及切割速...采用激光切割方法对OSR(Optical Solar Reflector)片的制造工艺进行了试验研究,分析了激光切割OSR片的可行性及切割参数对加工质量的影响因素,通过试验数据的理论分析,建立了OSR片激光切割的数学模型,得到了切割宽度与切割功率及切割速度之间的关系,为实际应用提供了理论依据.展开更多
Recently, Chen and his team were active in the theoretical and practical study of a new heliostat for the use of solar energy. This work represents the first innovation in the area of heliostats after many years of li...Recently, Chen and his team were active in the theoretical and practical study of a new heliostat for the use of solar energy. This work represents the first innovation in the area of heliostats after many years of little progress. The mathematical development of the tracking and concentration optics principles, and the practical implementation and demonstration of the technology, are both very interesting advances in this field. Many applications are possible for this technology such as generation of solar electricity and solar industrial process heat.展开更多
Climatic characteristics of broadband solarradiation (Rs) in Chinese arid and semi-arid areas are reported in this study. The annual average daily Rs in thearid and semi-arid areas is 16.3 ± 5.77 and 15.3 ± ...Climatic characteristics of broadband solarradiation (Rs) in Chinese arid and semi-arid areas are reported in this study. The annual average daily Rs in thearid and semi-arid areas is 16.3 ± 5.77 and 15.3 ± 5.16 MJm-2 d-1, respectively. The highest value (17.2 ± 5.84 MJm-2 d-1) appears in an arid area at Linze. The lowest valueappears in the semi-arid area of Ansai. Pronounced seasonal variation of Rs is observed with the highest value insummer and the lowest in winter. The clearness indexshowed similar seasonal pattern at most sites, with theminimum observed in the summer and the highest valuesin winter at both arid and semi-arid areas. The seasonalvariation of the ratio of Rs to its extraterrestrial value Kt inthe arid area is more significant than that observed in thesemi-arid region, and it is caused by the different range ofvariation of water vapor between arid and semi-arid areasThe seasonal fluctuations in Rs and Kt are mainly controlled by the water vapor content in these areas. Theaerosol particles have significant influence on Rs and Kt atstations with higher aerosol burden.展开更多
Over the Asian continent,high aerosol loading is critical to ensure the high accuracy of CO_2 retrieval in the near infrared absorption band.Simulations were performed to explore the effect of light path modification ...Over the Asian continent,high aerosol loading is critical to ensure the high accuracy of CO_2 retrieval in the near infrared absorption band.Simulations were performed to explore the effect of light path modification by aerosol son the atmospheric CO_2 near infrared band(6140-6270 cm^(-1)).The Vector LInearized Discrete Ordinate Radiative Transfer(VLIDORT) model and the Line-By-Line Radiative Transfer Model(LBLRTM) were used for forward calculations.The U.S.standard atmosphere was used for atmospheric profiles.The results indicate that the aerosols caused similar effects to increases in CO_2 in the planetary boundary layer and became more significant with aerosol layer rising while aerosol optical depth was 0.1.This effect will cause an over estimation of the CO_2 mixing ratio in the retrieval process and an under estimation in the aerosol layer.The results also indicate that the effect of urban and industrial aerosols is smaller than that of non-absorbing and dust aerosols because of the nearly constant absorption properties in the near infrared band.展开更多
文摘研究了一种基于超材料的光学太阳反射镜(optical solar reflector,OSR),其由掺铝氧化锌(AZO)超表面、MgF2介质层和Ag金属反射层三层结构组成。在热红外AZO超表面激发表面等离激元共振增强电磁吸收,MgF2介质层介电常数的稳定性减少了吸收振荡带来的反射,在可见光照射下AZO超表面和MgF2介质层的透明特性可降低太阳辐射损耗,Ag金属反射层可有效抑制透射。仿真结果表明,优化后的OSR在0.3~2.5μm内有17.6%的低太阳吸收率,在2.5~30.0μm内有86.5%的高红外发射率。此外,偏振和入射角度对其性能影响较小。该结构在红外波段实现了较好的吸收,在红外热成像、辐射制冷等领域也具有潜在应用价值。
文摘Recently, Chen and his team were active in the theoretical and practical study of a new heliostat for the use of solar energy. This work represents the first innovation in the area of heliostats after many years of little progress. The mathematical development of the tracking and concentration optics principles, and the practical implementation and demonstration of the technology, are both very interesting advances in this field. Many applications are possible for this technology such as generation of solar electricity and solar industrial process heat.
基金supported by the National Basic Research Program of China (Grant No. 2006CB403702)the National High Technology Research and Development Program of China (Grant No. 2006AA06A301)
文摘Climatic characteristics of broadband solarradiation (Rs) in Chinese arid and semi-arid areas are reported in this study. The annual average daily Rs in thearid and semi-arid areas is 16.3 ± 5.77 and 15.3 ± 5.16 MJm-2 d-1, respectively. The highest value (17.2 ± 5.84 MJm-2 d-1) appears in an arid area at Linze. The lowest valueappears in the semi-arid area of Ansai. Pronounced seasonal variation of Rs is observed with the highest value insummer and the lowest in winter. The clearness indexshowed similar seasonal pattern at most sites, with theminimum observed in the summer and the highest valuesin winter at both arid and semi-arid areas. The seasonalvariation of the ratio of Rs to its extraterrestrial value Kt inthe arid area is more significant than that observed in thesemi-arid region, and it is caused by the different range ofvariation of water vapor between arid and semi-arid areasThe seasonal fluctuations in Rs and Kt are mainly controlled by the water vapor content in these areas. Theaerosol particles have significant influence on Rs and Kt atstations with higher aerosol burden.
基金funded by the Strategic Priority Research Program-Climate Change:Carbon Budget and Relevant Issues (Grant No. XDA05040200)the National High Techonology Research and Development Program of China (863 Program,Grant No. 2011AA12A104)
文摘Over the Asian continent,high aerosol loading is critical to ensure the high accuracy of CO_2 retrieval in the near infrared absorption band.Simulations were performed to explore the effect of light path modification by aerosol son the atmospheric CO_2 near infrared band(6140-6270 cm^(-1)).The Vector LInearized Discrete Ordinate Radiative Transfer(VLIDORT) model and the Line-By-Line Radiative Transfer Model(LBLRTM) were used for forward calculations.The U.S.standard atmosphere was used for atmospheric profiles.The results indicate that the aerosols caused similar effects to increases in CO_2 in the planetary boundary layer and became more significant with aerosol layer rising while aerosol optical depth was 0.1.This effect will cause an over estimation of the CO_2 mixing ratio in the retrieval process and an under estimation in the aerosol layer.The results also indicate that the effect of urban and industrial aerosols is smaller than that of non-absorbing and dust aerosols because of the nearly constant absorption properties in the near infrared band.
