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BASIC TYPES OF CONCENTRATORS 459<br />

Horizontal<br />

elevation<br />

axis<br />

Polar<br />

axis<br />

Figure 11.4 One-axis tracking configurations. (a) One-axis horizontal tracker with reflective<br />

trough. (b) One-axis polar axis tracker with reflective trough<br />

effects is that static concentrator design with concentration ratios in the range of 2 to 12<br />

have been proposed and researched. Usually they employ nonimaging optics such as the<br />

compound parabolic concentrator (CPC) shown in Figure 11.5 or total internal reflecting<br />

concentrators that will be discussed in Section 11.4.

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