| 摘要 |
The parabolic trough collector includes a single-axis parabolic mirror ( 1 ) and a receiver tube ( 2 ) arranged at the focal point (F) of the parabolic mirror ( 1 ). The receiver tube ( 2 ) includes an absorber tube ( 4 ) and an outer tubular glass jacket ( 3 ) around it. To compensate for focusing errors in the parabolic collector and thus to reduce associated geometric optical losses, the tubular jacket ( 3 ) is provided with structural elements ( 9 a , 9 b , 9 c , 9 d), which focus sunlight reflected from the mirror as well as sunlight that falls directly on the receiver tube from the sun on the absorber tube. The receiver tube is preferably arranged relative to the parabolic mirror, so that its center is displaced from the focal point (F) by a distance equal to half the spacing between the tubular jacket ( 3 ) and the absorber tube ( 4 ).
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