Device for the concentration of solar radiation, comprising an inflatable concentrator cushion

A device for concentration of solar radiation in an absorber, comprising an inflatable concentrator cushion, which comprises a cover film element comprising a light-permeable entry window for coupling in solar radiation and a reflector film, which sub-divides the concentrator cushion into at least two hollow spaces, for the concentration of solar radiation in the absorber, comprising a pivoting apparatus, by which the concentrator cushion can be pivoted, and comprising a retaining apparatus mounted to the pivoting apparatus, for retaining the concentrator cushion, wherein the retaining apparatus comprises an upper longitudinal member, which extends in a longitudinal direction of the concentrator cushion and which is arranged on an air-tight closed upper passage opening of the concentrator cushion, and a lower longitudinal member, which extends in the longitudinal direction of the concentrator cushion and which is arranged on an air-tight closed lower passage opening of the concentrator cushion,

• wherein the lower longitudinal member passes through the lower passage opening of the concentrator cushion from the outside to the inside, wherein the upper longitudinal member and the lower longitudinal member each extend at least along more than half of the length of the concentrator cushion in a longitudinal direction of the concentrator cushion,
• wherein the upper longitudinal member is connected to longitudinal edges of the cover film element, which longitudinal edges delimit the upper passage opening, and the lower longitudinal member is connected to longitudinal edges of a bottom film element of the concentrator cushion, which longitudinal edges delimit the lower passage opening,
• wherein the lower passage opening comprises an opening in the bottom film element from a lower one of the two hollow spaces to the outside,
• wherein the absorber is suspended on the upper longitudinal member of the retaining apparatus in an upper hollow space of the at least two hollow spaces of the concentrator cushion, the absorber suspended directly below the upper longitudinal member,
• wherein the pivoting apparatus comprises at least one pivoting element, which surrounds the concentrator cushion in its circumferential direction, to an inner side of which pivoting element the upper longitudinal member and the lower longitudinal member of the retaining apparatus are secured,
• wherein the at least one pivoting element is a pivoting ring, and
• wherein the lower longitudinal member is arranged in a plane that comprises a center point of the pivoting ring and the upper longitudinal member.