The key component - SCHOTT PTR 70 Receiver
With development and production of receivers, we advance as one of the world’s leading suppliers of Concentrated Solar Power plant components. At the same time, this young business field completes SCHOTT Solar's product portfolio for the use of solar energy.
In addition to the optical precision of the mirrors the four-meter-long receivers, which are vacuum-sealed and embedded in a glass body, play a key role in the efficiency of parabolic trough power plants. They convert the solar radiation to heat. The sheath consists of coated, highly transparent and robust borosilicate glass. The SCHOTT Solar receiver PTR® 70 has a new type of anti-reflection coating which has a high abrasion resistance and at the same time allows the transmission of more than 96 percent of the sun’s radiation. The absorber coating has an absorption degree of approx. 95 percent and very low emittance of below 14 percent heat radiation at a temperature of about 350 to 400 centigrade.
The glass-to-metal sealing and the bellow, that is necessary to compensate the different expansion of glass and metal, are not arranged in succession (as it is common) but on top of each other. This means that about 96 percent of the receiver’s length is actually used – around two percent more than with competitors’ products. Comparison measurements by the “Deutsches Zentrum für Luft- und Raumfahrt” (DLR) on the “Plataforma Solar de Almería” testing grounds in southern Spain have confirmed that the SCHOTT Solar receiver PTR® 70 is two percent more efficient.
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