Steinbach, F.F.SteinbachKoch, LottaLottaKochHermann, MichaelMichaelHermannWitulski, J.J.WitulskiTekkaya, A. ErmanA. ErmanTekkaya2022-03-112022-03-112012https://publica.fraunhofer.de/handle/publica/37603610.4028/www.scientific.net/KEM.504-506.137A 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.enSolarthermie und OptikSolarthermieSolaranlage621conference paper