Bfg Glassgroup

Otto Stehl

Paul Derner

Hans Sonntag

Hans Spakowski

A solar-energy collector has a frame receiving a double-pane unit consisting of a pair of transparent panes hermetically sealed together and defining the flow chamber for the heat-collecting fluid. The frame also supports a cover pane which defines, with the aforementioned unit, a heat-insulating dead-air space. The pane of the unit turned toward the sun is provided with an emission-limiting coating on its side facing the dead-air space while the pane of the unit turned away from the sun is provided with means for increasing its heat-absorption capacity. The frame members at opposite sides of the collector can be provided with fittings for connecting the collector to a source of the heat-absorbing fluid and to the output line of the collector.

Solar-energy collector

A light transmitting panel composed of at least two panes held in spaced relation by a spacer assembly to define at least one space between panes is given improved sound damping properties by employing panes which exhibit at least two different masses per unit surface area, by causing the space between panes to be sealed from the external atmosphere, and by filling this space with a gaseous medium whose composition is such that the velocity of sound propagation therethrough is different from that in dry air at the same pressure and temperature as the medium.

Light transmitting panel

A light transmitting panel composed of at least two panes held in spaced relation by a spacer assembly to define at least one space between panes is given improved sound damping properties by giving such space a thickness of greater than 9mm, by causing the space between panes to be sealed from the external atmosphere, and by filling this space with a gaseous medium composed of air and at least one other gas, the air constituting at least 30%, by volume, of the medium, and whose composition is such that the velocity of sound propagation therethrough differs by at least 5% from that in dry air at the same pressure and temperature as the medium.

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Essen, Germany

Otto Stehl