Lifetime modeling of polypropylene absorber materials for overheating protected hot water collectors

• Published in: Solar energy Vol. 125; pp. 324 - 331
• Main Authors: Wallner, G.M., Povacz, M., Hausner, R., Lang, R.W.
• Format: Journal Article
• Language: English
• Published: New York Elsevier Ltd 01-02-2016; Pergamon Press Inc
• Subjects: Absorber; Carbon black; Lifetime; Polypropylene; Solar energy; Solarthermal collector; Temperature distribution; Lifetime; Solarthermal collector; Polypropylene; Absorber
• ISSN: 0038-092X; 1471-1257
• DOI: 10.1016/j.solener.2015.12.035

•Lifetime of 2 PP grades for absorbers was assessed using a semi-empirical approach.•Depending on the climate zone the lifetime was ranging from 8 up to 50years.•For a novel grade the lifetime was 2 times higher compared to a benchmark grade.•Improved performance was attributable the special morphology of the novel grade.
For the utilization of polymeric materials in high-demanding applications like solar thermal systems it is of utmost importance to define the performance requirements and to investigate the applicability of components for defined systems under service relevant conditions. This paper deals with the lifetime estimation of black-pigmented polypropylene (PP) absorber grades for overheating protected solar thermal collector systems for hot water preparation in five representative climate zones. Based on experimental aging data in hot air and heat carrier fluid at elevated temperatures (95°C, 115°C and 135°C) and climatic input data, as well as deduced loading conditions and absorber temperature distributions, the lifetime was calculated using a theoretical and an empirical extrapolation approach and assuming cumulating damages in service relevant temperature intervals. Depending on the PP grade, the extrapolation method and the location, endurance limits ranging from 8 to 50years were obtained. The PP grade with ß-spherulithic structures and less carbon black exhibited a superior performance (factor 2) compared to a well-established grade which is currently widely used for swimming pool absorbers.