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Keywords

Solar collectors, Selective coatings, Photo-thermal conversion, Halogen lamp, Irradiation, Absorptance

Document Type

Article

Abstract

This study reports an investigation of the photo-thermal conversion performance of nickel-reinforced composite coatings prepared from commercially available black paints under controlled artificial NIR-Dominated halogen irradiation source. Two coating matrices were employed: the first is a modified silicone resin with black manganese ferrite and chromite black, the second is acrylic resin containing carbon black (PBK7) coating. Both coatings were combined with nickel microparticles. The coatings were characterized using scanning electron microscope, electron energy dispersive spectrometer, and UV-Vis-NIR spectroscopy measurement to investigate their structural, morphological, compositional and optical properties. The Photo-thermal conversion performance was evaluated under irradiation from a tungsten-halogen lamp at 850 W/m2. The ISO 9806 standard formulation was used to quantify the thermal efficiency attributes. With absorptance values of 94.9% for the silicone-resin-based coating and 94.4% for the acrylic-based coating, compared to 92.6% for the conventional coating, the nickel-reinforced coatings outperformed traditional heat-resistant black paint. The acrylic-based coatings reached a maximum substrate temperature of 105.4 °C, while the silicone-resin-based coatings reached a maximum temperature of 102.6 °C. The bare substrate temperature reached a maximum of 74 °C, while the substrate temperature greatly exceeded that of the typical coating (101 °C). The optical efficiency (η 0) was 0.862 for the nickel-reinforced silicone-resin coating, 0.912 for the nickel-reinforced acrylic coating, and 0.578 for the conventional heat-resistant paint (HRP). It can be concluded that adding nickel particles improves the coating's photothermal conversion, providing a scalable and cost-effective method for producing enhanced selective absorber coatings for solar thermal applications.

DOI

10.30684/2412-0758.1552

First Page

84

Last Page

105

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