Abstract
The possibilities and problems of durability tests of solar absorber coatings are discussed with respect to service lifetime estimation methods. Constant temperature tests in air as well as humidity and condensation tests have been carried out at different load levels on six commercially available solar absorber coatings (black chrome, black nickel, coloured stainless steel and nickel pigmented anodized aluminium). The results of the temperature tests have been used for a lifetime estimation based on Arrhenius relations. The estimated degradation behaviour and the changes of the spectral reflectance of the coatings after the accelerated indoor tests are compared with the results of outdoor tests under stagnation conditions. In this way, the influence and the importance of the particular degradation factors (temperature, humidity, pollutants, etc.), the specific sensitivity or stability of the tested coatings with respect to these degradation factors, and the applicability of the lifetime estimation method have been investigated.
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