“…In order to test concentrating solar collectors, some studies adapted the collector model from the European Standard EN 12975-2 (EN 12975-2, 2006) to a parabolic trough collector (PTC) (Rojas et al, 2008;Fischer et al, 2006;Janotte et al, 2009), but the issue of the tracking accuracy was not analyzed because the standards does not mention it (for more details on tracking accuracy see Sallaberry et al, 2015). Some studies were focused on large size CPC or flat-plate with reflectors (Perers et al, 1994;Rö nnelid et al, 1996;Rö nnelid and Karlsson, 1996;Perers et al, 1993), and on the difficulties associated with its size.…”