Does anyone know how to assume a broken mirror for a parabolic trough solar collector system?

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N. Beithou

This could be done by taking the area fraction broken area over the total area

Juan Francisco Briceño

It is necessary to to project in the position in the paraboloide of the area of the piece of mirror in a plane perpendicular to the direction of the solar beams. To project the total surface of the paraboloide in a plane perpendicular to the direction of the solar beams. Then you divide the area projected of piece of mirror between the total area it projects. This gives acceptable value of lost in this piece