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Investigation of new integrated solar thermal absorbers by means of a 2-D model

: Koch, L.; Hermann, M.; Bauch, M.

Volltext urn:nbn:de:0011-n-2365426 (529 KByte PDF)
MD5 Fingerprint: d9d2f5852bbe8f0c93bb7a22291af251
Erstellt am: 24.4.2013

Frankovic, B. ; International Solar Energy Society -ISES-; Croatian Solar Energy Association, Rijeka:
Eurosun 2012. Solar energy for a brighter future. Book of proceedings. CD-ROM : ISES - Europe solar conference, Rijeka, Croatia, September 18-20, 2012
Rijeka: Croatian Solar Energy Association, 2012
ISBN: 9789536886203
ISBN: 9536886200
ISBN: 9783981465921
ISBN: 398146592X
8 S.
Europe Solar Conference (EuroSun) <2012, Rijeka>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
Solarthermie und Optik; Solarthermie; Solaranlage

Both cost reduction and flexibility of shape are two important challenges for solar thermal collectors. Classical fin-and-tube absorbers of copper and/or aluminum produced in a welding or soldering process have low cost reduction potential. New sheet metal forming processes like roll-bonding, hydroforming or deep-drawing are promising and in the focus of several projects of Fraunhofer ISE [1, 2, 3]. A new approach of Fraunhofer ISE is to develop multifunctional solar collectors based on an Ultra High Performance Concrete (UHPC). The aim of this approach is to obtain flexible, cost-effective and sustainable collectors which can be integrated into building façades. New manufacturing methods and materials require new integrated absorber designs and adapted analytical models. Using 1-D absorber models [4] it could be shown that in case of UHPC its low thermal conductivity and the resulting low collector efficiency factor F' can be overcompensated by adapting the absorber design. However, this simplified model does not consider 2-D heat transport effects. Therefore a 2-D model was set up using the numerical program OpenFoam®. Simulating F' of the classical absorber designs the model shows very good correspondence with the 1-D model and can now be used to calculate F' also for more complex absorber structures. In the future the model can be extended to investigate also the fluid characteristics depending on channel cross-sections.