Abstract: An arrangement for ventilating the passenger compartment of a motor vehicle having a hinged roof cover, having one or several electric fans as well as a solar module integrated into the roof cover. The fans are constructed as axial-flow fans and are arranged in the area below the rear transverse edge of the roof cover. The axial-flow fans are coupled kinematically with the roof cover and its frame in such a manner that, when the roof cover is raised, they are swivelled in a forced manner into an effective position in the air gaps and, when the roof cover is closed, are swivelled into an ineffective position inside the roof recess without significantly reducing the headroom. The solar module which covers the roof cover for the most part is constructed in the semiconductor thin-film technique and, in a locally limited manner, has a transparency for the incident sunlight.

Abstract: Mirror structures for reflecting and concentrating radiation energy, so-ced heliostats, comprise a rotatably pivoted supporting framework made of flexurally stiff supporting members (12, 13, 14), with single mirrors adjustably attached thereto. In order to be able to use thinner, lighter, not pre-bent, yet flexibly adjustable single mirrors, essentially flat planar carrying frames (1, 2, 4) are attached to the supporting framework, preferably by way of three-point connections (5). Several flexible, smaller individual mirrors (6) are mounted on each of these carrying frames, with the aid of axially adjustable pins distributed over the mirror plane.

Abstract: A system for generating solar energy utilizes a plurality of solar radiation absorption bodies formed as spherical balls which interact with solar radiation focalization devices which constitute paraboloid mirrors in order to effect heating of the spherical balls by the solar radiation which is concentrated at an irradiation position defined by the paraboloid mirrors. The heated balls are transported to a heat accumulator and after the heat has been absorbed therefrom they are returned to the focalization mirrors. At the mirrors, balls are held in holding devices until a heated ball leaves the irradiation position and switch devices operate to provide new balls to a vacant holding position. A feed and return system for transporting the balls between the accumulator and the focalization mirrors may comprise thermally insulated pipes and the balls may be moved by gravity feed or by a compressed air system.