| 摘要 |
PROBLEM TO BE SOLVED: To provide a tubular cover for a parabolic trough collector for helping accumulation of sun radiation more than a conventional receiver tube and having an uptake factor of the best capability. SOLUTION: In the case that the absorption tube is provided in the tubular cover, the tubular cover 3 for the parabolic trough collector has structure elements 9a, 9b, 9c and 9d, at which sunlight is focused, at the absorption tube provided in the tubular cover. COPYRIGHT: (C)2004,JPO&NCIPI
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