A High Effective Selective Absorbing Coating for Solar Thermal Collectors

Rumen Kirilov; P. Stefchev; Z. Alexieva; H. Dikov

doi:10.4028/www.scientific.net/SSP.159.97

Paper Titles

Thickness Dependence of Surface and Interface Phonon-Polariton Modes in InN/AlN Nanolayers
p.77

Search for a Suitable Ohmic Metallization Scheme to GaN/AlGaN Heterostructures for Sub-Micron Devices
p.81

High-Quality GaInAsSb and GaAlAsSb Layers for Thermophotovoltaics Grown by Liquid-Phase Epitaxy
p.87

Preparation and Characterization of Al₂O₃ Thin Films for Catalytic Activity Studies
p.91

A High Effective Selective Absorbing Coating for Solar Thermal Collectors
p.97

Influence of Thermal Annealing on the Properties of Sputtered Si Rich Silicon Oxide Films
p.101

Ferromagnetic Nanomaterials Obtained by Thermal Decomposition of Ferrocene
p.105

Investigation of Pulsed Laser Annealing of CdS Layers Designed for Thin-Layer Solar Cells
p.109

Investigation of ZrN Hard Coatings Obtained by Cathodic Arc Evaporation
p.113

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A High Effective Selective Absorbing Coating for Solar Thermal Collectors

Abstract:

High effective selective absorbing bimetallic structures of Sn and Ni for solar thermal collectors have been investigated. They were produced by cathode electrodeposition on polished copper plates from water solution. Scanning electron microscopy micrographs show that they consist of a highly branching layer of bimetallic needles. They serve as a radiation trap for the solar radiation because of multiple reflections. The reflectance spectra were measured in the visible and infrared range. The absorptance of the coating was calculated as 98% in the solar radiation range and the thermal emittance in the infrared region at 100 °C - as 10%. The selective absorbing coatings are investigated by X-ray diffraction analysis and X-ray photoеlectron spectroscopy as well as optical spectra in the UV-VIS and IR region. The samples with selective absorbing coatings have been tested at natural solar radiation. The results show that the new coatings have substantial advantages in comparison to the widely used black chrome.