Low-cost black Cu–Ni alloy coatings for solar selective applications

Tharamani, C. N.; Mayanna, S. M.

doi:10.1016/j.solmat.2006.12.004

Cited by 33 publications

(14 citation statements)

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“…The simplest way of improving the selectivity of such a thin layer is to place it on a strong reflector such as a metal. This approach is used with cermets [25] where the long wavelengths essentially do not "see" the thin layer and strongly reflect from the backside metal. Figure 5 shows results for a metal backed thin absorbing layer, where the carbon is placed on 200nm of gold.…”

Section: Resultsmentioning

confidence: 99%

Broadband metasurface absorber for solar thermal applications

Wan

Chen

Cryan

2015

J. Opt.

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In this paper we propose a broadband polarization independent selective absorber for solar thermal applications. It is based on a metal-dielectric-metal metasurface structure, but with an inter-layer of absorbing amorphous carbon rather than a low loss dielectric. Optical absorbance results derived from Finite Difference Time Domain modelling are shown for ultra-thin carbon layers in air and on 200nm of gold for a range of carbon thicknesses. A gold-amorphous carbon-gold trilayer with a top layer consisting of a 1D grating is then optimised in 2D to give a sharp transition from strong absorption up to 2m to strong reflection above 2m resulting in good solar selective performance. The gold was replaced by the high melting point metal tungsten and is shown to have very similar performance to the gold case. 3D simulations then show that the gold based structure performs well as a square periodic array of squares, however there is low absorption around 400nm. A cross based structure is found to increase this absorption without significantly reducing the performance at longer wavelengths.

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Section: Resultsmentioning

confidence: 99%

Broadband metasurface absorber for solar thermal applications

Wan

Chen

Cryan

2015

J. Opt.

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“…Cindrella [63] analyzed the efficiency of the solar selective coatings with various combinations of the optical properties and their impact on the performance of solar thermal systems of different concentration ratio (Crs). Tharamani and Mayanna [64] reported the development of the Cu-Ni alloy coating as a selective surface for solar energy. The coatings were deposited by using Hull cell and optimized deposition parameter to achieve high solar absorptance α = 0.94 and low emittance ε = 0.08.…”

Section: Others Solar Selective Coatingsmentioning

confidence: 99%

High-Temperature Solar Selective Coating

Usmani

Harinipriya

2015

Lecture Notes in Electrical Engineering

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Solar energy has maximum potential in comparison with other renewable energy sources. Solar thermal conversion is one of the direct methods for harnessing solar energy using solar selective absorbers. This review article summarizes the recent research progress on the high-temperature solar selective coatings, methodology, and process involved in coating, computer modeling, as well as designs of coatings, optical, compositional, and structural properties of selective coatings. The major bottleneck in developing a solar selective coating is its stability in air at temperature higher than 450°C that possess thermal and structural stability in both individual and combined layers. New possibilities to overcome the abovementioned problems on the performance of solar selective coatings are discussed.

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“…To improve the spectral selectivity of the solar selective absorber and high corrosion resistance, several pigments deposited in the Al 2 O 3 film have been studied with different techniques, e.g. coatings of black Cu-Ni, black Ni-Co by electro-deposition [6,7], Co-Al 2 O 3 by anodization [8], Cu-CuAl 2 O 4 hybrids deposited in anodic aluminium oxide (AAO) by electrochemical processes [9], carbon nano-particles embedded in SiO 2 , ZnO and NiO matrices by a sol-gel technique [10] [15,16]. The corrosion resistance of Sn-Al 2 O 3 is higher than that of the Ni-Al 2 O 3 [16].…”

Section: Introductionmentioning

confidence: 99%

Influence of tin content on spectral selectivity and thermal conductivity of Sn–Al2O3 solar selective absorber

Wamae

Suriwong

Threrujirapapong

2018

Mater Renew Sustain Energy

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The tin-pigmented aluminium oxide film (Sn-Al 2 O 3 ) based solar selective absorber was successfully prepared with three different contents of tin by an anodization process. The phase and morphology of the Sn-Al 2 O 3 were measured by X-ray diffractometer and a scanning electron microscope equipped with an energy dispersive X-ray analyser. The reflectance (R) of the coating was determined by Ultraviolet-visible-near infrared spectrophotometer in the wavelength interval of 300-2500 nm and the Fourier transform infrared spectrophotometer in the wavelength of infrared region (2500-25,000 nm). As a result, aluminium and tin phases were detected at the coating surface. The Al 2 O 3 films were formed and compacted as a barrier on the Al substrate. The compositions of the oxide film composed of tin (Sn), aluminium (Al) and oxygen (O) elements. With increasing Sn content, the solar absorptance (α sol ) gradually increased, but it has little effect on the thermal emittance (ε therm ). The thermal conductivity of Sn-Al 2 O 3 samples decreased with increasing Sn content as a result of the increasing thickness of the Sn layer at the interface leading to obstruct the free electrons and phonon contributions. The present result suggests that the increasing Sn content in the Sn-Al 2 O 3 coating can enhance the solar selectivity properties and a good solar absorber material.

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Low-cost black Cu–Ni alloy coatings for solar selective applications

Cited by 33 publications

References 50 publications

Broadband metasurface absorber for solar thermal applications

Broadband metasurface absorber for solar thermal applications

High-Temperature Solar Selective Coating

Influence of tin content on spectral selectivity and thermal conductivity of Sn–Al2O3 solar selective absorber

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