Parabolic trough solar collector

专利名称：Parabolic trough solar collector发明人：James H. Eaton申请号：US06/372882申请日：19820429公开号：US04493313A公开日：19850115

摘要：A parabolic trough solar collector using reflective flexible materials is disclosed.A parabolic cylinder mirror is formed by stretching a flexible reflecting material betweentwo parabolic end formers. The formers are held in place by a spreader bar. Theresulting mirror is made to track the sun, focusing the sun's rays on a receiver tube. Theends of the reflective material are attached by glue or other suitable means toattachment straps. The flexible mirror is then attached to the formers. The attachmentstraps are mounted in brackets and tensioned by tightening associated nuts on the endsof the attachment straps. This serves both to stretch the flexible material orthogonal tothe receiver tube and to hold the flexible material on the formers. The flexible mirror isstretched in the direction of the receiver tube by adjusting tensioning nuts. If materialswith matching coefficients of expansion for temperature and humidity have been chosen,for example, aluminum foil for the flexible mirror and aluminum for the spreader bar, themirror will stay in adjustment through temperature and humidity excursions. Withdissimilar materials, e.g., aluminized mylar or other polymeric material and steel, spacerscan be replaced with springs to maintain proper adjustment. The spreader bar crosssection is chosen to be in the optic shadow of the receiver tube when tracking and not tointercept rays of the sun that would otherwise reach the receiver tube. This invention can

also be used to make non-parabolic mirrors for other apparatus and applications.

申请人：EATON; JAMES H.

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