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The same BK7 glass has been considered for all the SOE’s under comparison. Though BK7 can be molded (see for instance, http://www.rpoptics.com/index.php?page=rpo-moldable-glass-data ) is more common the use of, for instance, B270. The light absorption in B270 is slightly higher than in BK7, which causes that if the comparison is done using B270, the efficient of the RTP (whose optical path is longer) is penalized the most.
See, for instance: www.sol3g.com , http://www.solfocus.com/ , and K. Araki et al., “Development of a new 550X concentrator module with 3J cells-Performance and. Reliability-”, Proc. 31st IEEE PVSC, (2005).
P. Zamora, A. Cvetkovic, M. Buljan, M. Hernández, P. Benítez, J.C. Miñano, O. Dross, R. Alvarez, A. Santamaría, “Advanced PV Concentrators”, 34th IEEE PVSC, (2009).
M. Victoria, C. Domínguez, I. Antón, G. Sala, “Comparative analysis of different secondary optical elements for aspheric primary lenses,” Opt. Express 17, 6487–6492 (2009). The design with highest CAP* in this reference has a rotationally-symmetric CPC-type TIR-based secondary. It achieved CAP* = 0.54 for a square aperture and square cell (for which the FK has a higher value of CAP* = 0.57–0.61). Moreover, it produces a poor irradiance uniformity. It also has the encapsulation problems discussed in Section 5.