The Photothermal Conversion Characteristics of a Selective Coating Decorated with ZrO2 and Fe Powders
Keywords:
Coating, Photothermal effects, Optical absorption, NanopowdersAbstract
Abstract: The photothermal conversion characteristics of black, composite, and selective coatings were investigated. ZrO2 and Fe particles were incorporated into the heat-resistant black paint (HRP) to improve the conversion capability of the coating. The coatings and the particles were applied onto aluminium substrates using the direct spraying method. This resulted in layers having thicknesses of 323.5 μm and 837 μm for the ZrO2- and Fe- containing coatings. The addition of these powders led to a decrease in the coating density from 1.67 g/cm3 to 0.31 g/cm3 and 0.5 g/cm3 for the ZrO2/HRP and Fe/HRP coatings, respectively. The addition of the particles was found to improve the solar-to-thermal conversion of the primary paint significantly. Maximum absorbance of 97.81% and a substrate temperature of 382.65 K after 40 minutes of radiation exposure were achieved using the Fe/HRP system. The photothermal conversion characteristics were analyzed based on the structural, compositional, and physical properties of the composite coatings. The absorption spectra in the UV-Vis range of the Fe/HRP coating showed higher peaks than those exhibited by the ZrO2/HRP coating, emphasizing the higher photo-thermal conversion of the Fe/HRP coating. Owing to their ease of application and high conversion performance, the developed coatings are superior to many existing coating systems for flat-plate collectors.
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