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Contactless efficient two-stage solar concentrator for tubular absorber

机译：管状吸收器的非接触式高效两级太阳能聚光器

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The design of a new type of two-mirror solar concentrator for a tubular receiver, the XX concentrator, is presented. The main feature of the XX is that it has a sizable gap between the secondary mirror and the absorber and it still achieves concentrations close to the thermodynamic limit with high collection efficiencies. This characteristic makes the XX unique and, contrary to current two-stage designs, allows for the location of the secondary outside the evacuated tube. One of the XX concentrators presented achieves an average flux concentration within +/-0.73 deg of 91.1% of the thermodynamic limit with a collection efficiency of 96.8% (i.e., 3.2% of the rays incident on the primary mirror within +/-0.73 deg are rejected). Another XX design is 92.5% efficient and receives 95.1% of the maximum concentration. These values are the highest reported for practical concentrators, to our knowledge. The gap between the absorber and the secondary mirror is 6.8 and 10.5 times the absorber radius for each concentrator. Moreover the rim angle of the primary mirror is 98.8 and 104.4 deg in each case, which is of interest for the collector's good mechanical stability. (C) 1997 Optical Society of America.
机译：提出了一种用于管状接收器的新型双镜太阳能聚光器XX的设计。 XX的主要特征是，它在辅助反射镜和吸收器之间有相当大的间隙，并且仍以高收集效率达到接近热力学极限的浓度。该特性使XX独树一帜，并且与当前的两级设计相反，它允许在真空管的外部放置次级部件。提出的XX个聚光器之一实现了平均热通量浓度在热力学极限的91.1％的+/- 0.73度内，具有96.8％的收集效率（即在+/- 0.73 deg内入射在主镜上的光线的3.2％被拒绝）。另一个XX设计的效率为92.5％，接收的最大浓度为95.1％。据我们所知，这些值是实际选矿厂报告的最高值。每个聚光器的吸收器和辅助反射镜之间的间隙是吸收器半径的6.8和10.5倍。此外，主镜的边缘角分别为98.8度和104.4度，这对于收集器的良好机械稳定性很重要。 （C）1997年美国眼镜学会。

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