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Solar Thermal Electricity Page 3
Trough Plants: Kramer Junction

Reflection of sunlight on the reflector pipe does not need to be uniform.

Figure 1. Parabolic reflectors. NREL ]

Collectors extend in the north-south direction, along a constant longitude (a longitudinal meridian). The collectors are spaced far enough apart to avoid shading each other in early morning and late afternoon, when the sun is away from the longitude meridian plane (Figure 2). That means more ground is illuminated the rest of the day, when the sun is higher and closer to the meridional plane (Figure 3).

Figure 2. Rows of collectors. The white rectangle along one of the rows of reflectors is the image of the underside of the receiver pipe being illuminated by the reflectors. NREL ]

Figure 3. When the sun is high, more land is illuminated between the collectors. NREL ]

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