A parabolic trough collector (PTC) is a type of that is straight in one dimension and curved as a in the other two, lined with a polished metal . The which enters the mirror parallel to its plane of symmetry is focused along the, where objects are positioned that are intended to be heated. In a, for example, food is placed at the focal line of a trough, which is cooke.
The trough is usually aligned on a north–south axis, and rotated to track the sun as it moves across the sky each day. Alternatively, the trough can be aligned on an east–west axis; this reduces the overall efficiency of the collector due to the sunlight striking the collectors at an angle but only requires the trough to be aligned with the change in, avoiding the need for tracking motors. This tracking method appr.
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