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Advanced procedure for the assessments of the lifetime of solar absorber coatings

: Köhl, M.; Heck, M.; Brunold, S.; Frei, U.; Carlsson, B.; Möller, K.

Volltext urn:nbn:de:0011-n-341684 (319 KByte PDF)
MD5 Fingerprint: 1910a85028c3688cf2a4a3074c4c2446
Erstellt am: 5.7.2008

International Solar Energy Society -ISES-:
ISES 2003, Solar World Congress. Proceedings. CD-ROM : Solar energy for a sustainable future ; June 14 - 19, 2003, Svenska Mässan Congress Center, Göteborg, Sweden
Göteborg, 2003
ISBN: 91-631-4740-8
8 S.
Solar World Congress <2003, Göteborg>
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()

New solar absorber coatings are developed and used in advanced collector designs with improved efficiency. The operation temperature as well as the stagnation temperature as the main durability load for the absorbers were increasing during the past due to these innovations.
Especially the highly selective new coatings have to suffer by these stronger loads. The service life estimation procedure developed in the framework of research activities of the IEA Solar Heating and Cooling Programme (Task 10 and Working Group Materials in Solar-Thermal Collectors) were based on load profiles for less advanced absorbers and collectors and did not take into account the impact of the optical properties of the absorber coatings on the stagnation temperature of the collectors, which is the main reason for temperature degradation. A new procedure was developed, which allows testing depending on the optical properties (Solar absorptance and thermal emittance) of the absorbers