A spectral splitting solar concentrator for cascading solar energy utilization by integrating photovoltaics and solar thermal fuel
A spectral splitting solar concentrator for cascading solar energy utilization by integrating photovoltaics and solar thermal fuel
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一种通过集成光伏和太阳热燃料实现太阳能级联利用的光谱分离太阳能聚光器
DOI：
10.1016/j.apenergy.2019.04.115
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发表时间：
2019-08
期刊：
影响因子：
11.2
通讯作者：
Wanjun Qu;H. Hong;Hongguang Jin
中科院分区：
文献类型：
--
作者：
Wanjun Qu;H. Hong;Hongguang Jin
全光谱太阳能利用是太阳能梯级利用的一个重要方面。光伏发电与太阳能热化学反应相结合的混合方法是将全光谱太阳能转化为电能和化学能的一种有吸引力的方法。本文提出了一种聚光太阳能光伏/热化学混合系统。同时，提出并设计了一种分光聚光器。该聚光器由上镜和子镜组成。上面的镜子使可见光谱能够集中到光致发光器件上。副镜允许红外和紫外光谱集中到太阳能热化学反应器上。描述了基于光线跟踪的设计方法。分析了太阳辐射在光化学反应器和热化学反应器上的分布。结果表明，在不使用二次光学元件的情况下，太阳辐射可以均匀地投射到光伏表面，同时也减轻了热化学反应器的太阳能通量集中问题。提出的光谱分裂集中器中引入的混合系统。太阳能的总转换效率可超过20%。与单独的光伏发电和太阳能热燃料相比，这种混合系统有可能提高太阳能转化为电力和燃料的效率，绝对提高幅度超过5%。分光聚光器的设计为全光谱太阳能的级联利用提供了可能。
Full-spectrum solar energy utilization has drawn widespread attention for cascading solar energy utilization. The hybrid approach integrating photovoltaic generation and solar thermochemical reaction is attractive to convert full-spectrum solar energy into electricity and chemical energy. This paper proposes a concentrating solar photovoltaic/thermochemical hybrid system. Meanwhile, a spectral splitting concentrator is proposed and designed. The proposed concentrator consists of above-mirror and sub-mirror. The above-mirror enables the visible spectrum to be concentrated onto photovoltaics. The sub-mirror allows the infrared and ultraviolet spectra to be concentrated onto a solar thermochemical reactor. The design methodology based on ray tracing is described. The distribution of solar radiation on the photovoltaics and the thermochemical reactor is made analysis. The results show that solar radiation can be uniformly cast to the photovoltaic surface without using secondary optical element; the common solar flux concentration of thermochemical reactor is also mitigated. The proposed spectral splitting concentrator is introduced in the hybrid system. The total conversion efficiency of the solar energy can exceed 20%. Compared with individual photovoltaic electricity and solar thermal fuel, this hybrid system has the potential to increase the conversion efficiency of solar energy into both electricity and fuel, with greater than 5% absolute enhancement. The design of the spectral splitting concentrator provides the possibility of cascading utilization of full-spectrum solar energy.