Ronnelid, M.; Perers, B.; Karlsson, B.
September 1996
Solar Energy, vol 57-3, p. 177-184
A 13.6 m2 east-west aligned CPC-collector (compound parabolic concentrator) with flat absorbers, proposed for use in large-area applications, has been built and tested and compared with a flat plate collector. The performance of the CPC at a working temperature of 50°C over ambient can be described by F'o = 0.75 and F'UL = 2.5 W m-2 K-1 while the flat plate collector is described by F'o = 0.80, andF 'UL = 3.3 W m-2 K-1. The large difference in heat loss coefficient is to a large degree explained by absorption of solar radiation in the reflectors in the CPC-collector. The incidence angle dependence of the optical performance of the two collectors showed a similar appearance. Both collector constructions are based on the LGB (long ground based) technology, which allows them to be built in large modules up to 170 m2.
Source: www.sciencedirect.com