Accelerated Aging Tests for Spectrally Solar Selective Absorbers Based on Nickel Oxide
Abstract
Solar selective coatings consisting on alumina/copper oxide matrix infiltrated with nickel oxides nanoparticles were obtained by spray pyrolysis technique. The deposition parameters were optimized to achieve high solar absorptance (α s>0.92) and low emittance (εT<0.7). Condensation, high temperature and aggressive pollutants tests are recommended for solar absorber coatings. However, the condensation test is the most important to perform on this type of solar absorbers because previous experience shows that alumina/copper can be sensitive to moisture. Stability in saline solution/water with different pH was also tested to determine the functioning domain. The samples optical characteristics before and after the accelerated aging testing were investigated. The influence of the antireflection layer – TiO2 on the solar absorbers stability and durability was investigated.