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Processing of new solar absorbers in steel design based on partially cold roll bonded hybrid semi-finished parts

: Steinbach, F.; Koch, L.; Hermann, M.; Witulski, J.; Tekkaya, A. Erman


Merklein, M.:
Material Forming ESAFORM 2012. Vol.1 : Selected, peer reviewed papers from the 15th Conference of the European Scientific Association on Material Forming, (ESAFORM 2012), March 14-16, 2012, Erlangen, Germany
Durnten-Zurich: TTP, 2012 (Key engineering materials 504-506)
ISBN: 978-3-03-785366-5
ISBN: 978-3-03-813690-3
ISBN: 3-03-785366-2
Conference of the European Scientific Association on Material Forming (ESAFORM) <15, 2012, Erlangen>
Fraunhofer ISE ()
Solarthermie und Optik; Solarthermie; Solaranlage

A new approach of manufacturing solar absorbers is presented with which it is possible to design the channel geometry as a quasi-fractal structure. The so called FracThermR structure (developed by Fraunhofer Institute for Solar Energy Systems) aims at reducing the pressure drop and at a uniform flow distribution. To manufacture these new absorbers, a fast, nearly continuous production process was developed which consists of partial cold roll bonding and subsequent hydroforming, similar to symmetric hydroforming of sheet metal pairs. With the help of a small demonstrator the feasibility of the hydroforming process is shown and the process chain is validated.