
452 Principles of Sustainable Energy Systems
© 2008 Taylor & Francis Group, LLC
The most common way to utilize a CPC collector is shown schematically in Figure 8.12
[17]. The long axis of the CPC trough is aligned in an east–west direction and that of the
normal through the trough apertures is tilted downward from the zenith by an angle equal
to the latitude. The angular acceptance is a wedge of half angle ±θ
c
. Whenever the sun’s
path lies within this “orange slice,” all of the direct solar radiation is collected, concen-
trated, and delivered to the absorber. In addition, some of the diffuse radiation entering
through the aperture is also di