Optical simulation, characterization and thermal stability of Cr2O3/Cr/Cr2O3multilayer solar selective absorber coatings

Khelifa, Amine; Soum‐Glaude, Audrey; Khamlich, S.; Glénat, Hervé; Balghouthi, Moncef; Guizani, Amenallah; Mâaza, M.; Dimassi, Wissem

doi:10.1016/j.jallcom.2018.12.286

Cited by 30 publications

(12 citation statements)

References 25 publications

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“…However, the absorbent surface of the solar collector tended to lose the heat energy when the heat of the absorbent surface is increased more than the ambient temperature. This one tended to make an increase in the emission rate by about 90% and consequently a reduction in the absorption efficiency with a range of 8e10% [9]. Generally, the dark coatings have high solar absorption rates while the bright and shiny colors are low because of being that the dark surfaces absorb all the wavy lengths.…”

Section: Methodsmentioning

confidence: 99%

“…1.The second one is coated with a chromium trioxide material which its properties are shown in Table 1 and Fig. 3 [9]. Each collector is formed by a metallic rectangular parallel box that is provided with an insulating material layer.…”

Section: Methodsmentioning

confidence: 99%

“…Therefore, the experimental reflectance spectrum of the SS/Cr 2 O 3 /Cr/Cr 2 O 3 solar absorber was successfully simulated using CODE software. It was found that this coating exhibited a good spectral selectivity of 0.82/ 0.21 at 300 C [9]. It was well known that the Nanomaterials were also used in different fields of engineering and particularly in heat transfer applications.…”

Section: Introductionmentioning

confidence: 95%

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Effect of Chromium Trioxide Coating on the Thermal Performance of Solar Thermal Collector

Alaskaree¹,

Al-khafaji²,

Al-Muhsen³

2020

Karbala International Journal of Modern Science

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This paper compared the thermal performance of two solar collectors. The first collector is coated by a dark black absorbent solar collector, and the second one coated by the chromium trioxide. The results of the second collector show a better selectivity in terms of greater radiation absorption, and less emission compared to the first collector. At the minimum solar irradiance time, the absorbed energy is increased from 908.28J to 1221.5J, and the thermal efficiency is improved from 37.3% to 50.1% when the chromium trioxide coating is used. Besides, at the maximum solar irradiance time, the absorbed energy is increased from 1340.5J to 1528.4J, and the thermal efficiency is improved from 63.9% to 78.9%. After three months exposing the collectors to outdoor conditions, the chromium trioxide coated collector show superior thermal performance over dark black coated collector. At the minimum solar irradiance time, the absorbed energy is increased by 877J and the thermal efficiency is improved by about 34% when the chromium trioxide coating is used. In addition, the absorbed energy and thermal efficiency are also increased from 501.1J and 20% to 1440.7J and 62.2% respectively when the solar irradiance is at its maximum value

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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Effect of Chromium Trioxide Coating on the Thermal Performance of Solar Thermal Collector

Alaskaree¹,

Al-khafaji²,

Al-Muhsen³

2020

Karbala International Journal of Modern Science

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“…The optical study for the selective surfaces in multilayer coating thin film demonstrated higher absorptivity coefficient ( α = 0.89) and lower emissivity ( ε = 0.15) at 300°C, when the sample is annealed at 400°C for 24 hours. From the theoretical computation, the value of absorptivity coefficient is increased by using CODE software to α = 0.916 and the emissivity still invariant at the same value ( ε = 0.15) . In addition, the composite (Cr 2 O 3 :TiO 2 ) was composed from the nanopowder TiO 2 with variable concentration of Cr 2 O 3 to synthesize a coating with a high‐temperature solid‐state process.…”

Section: Introductionmentioning

confidence: 99%

Spectrally selective coating of nanoparticles (Co₃O₄:Cr₂O₃) incorporated in carbon to captivate solar energy

et al. 2020

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Innovatory nanocomposite comprising nanomaterials Co 3 O 4 :Cr 2 O 3 and carbon (fuel ash) was designed to absorb solar energy. Different concentration ratios of Co 3 O 4 and Cr 2 O 3 nanoparticles were utilized as a dopant for fuel thin films synthesis via spin and casting methods on glass and aluminum substrates. The opticalproperties of the modified films demonstrated in the range of 250 to 1300 nm. The data were interpreted in terms of a phonon-assisted theory. Energy gap (E g ) of doped C was calculated with different concentration ratios of Co 3 O 4 :Cr 2 O 3 (0.5:2.5, 1:2, 1.5:1.5, 2:1, 2.5:0.5) wt%, and fixed concentration of C in 7wt%. The results showed E g of the doped samples in the range of 2.9 to 3.9 eV. In addition, the intensity of the solar radiation was measured. The absorptivity was in the range of 88 to 93.6%. The above results are comparable to those of semiconductors and have high absorptivity values when the nanocomposite was utilized on a flat plate collector as a coating to trap and absorb solar energy. K E Y W O R D S chromium oxide, cobalt oxide, emissivity and absorptivity, energy band gap, optical properties 1 | INTRODUCTIONGenerally, Iraq has 240 days of strong sunlight with energy of 5 kWh per square meter in a day. 1 Harvesting solar energy and utilizing it in domestic applications, such as heating the water or ventilation residential complexes, would be highly cost effective and environment friendly. Nanocomposite films are used for this purpose. The technology includes the use of the nanocomposite films as a coating on a flat plate collector to be spectrally selective surface. This surface has low emissivity and high absorptivity to solar energy to convert this solar light into heat. 1,2 Doping nanomaterials with carbon can cause a remarkable change to its optical properties. [3][4][5] Cobalt oxide (Co 3 O 4 ) is a prevalent factor having several oxidization states because of its unusual chemical and physical features. It is used in ceramics production as an additional factor to produce blue coloring glazes, photo-catalysis, 6-10 and absorbance energy storage. 5,11 Further, Co 3 O 4 does has significant electrical properties. When Co 3 O 4 is added to chromium oxide (Cr 2 O 3 ), a conductive network is created through the pores. 12-15 Among the oxides family, Co 3 O 4 is one of the multilateral oxide sided, it has properties similar to a p-type semiconductor, and the band gap ranges from 2.23 to 3.38 eV. 16,17 Co 3 O 4 has attracted exceptional attention in the domain of application technology for pigments and solar-selective surfaces. [18][19][20] The particle size of Co 3 O 4 for nano-or micro-size provides perfect performance for electrochemical of different ranges in electronic applications and solar energy coating. [21][22][23][24] Nanocrystalline thin films nickel-cobalt oxides (NiO-CoO) were deposited on steel and glass substrates to produce thin films of different concentrations by the chemical bath deposition (CBD) method. These thin films exhibited semiconductor feature...

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“…The preparation of high-temperature coating is mostly made by magnetron sputtering, mainly using metal particles as the absorption units in metal-dielectric cermet coatings, such as Cu/TiNxOy/TiO2/Si3N4/SiO2 [15], Pt/AlxOy [16], AlyTi1−y(OxN1−x) [17], AlCrSiN/AlCrSiON/AlCrO [18], etc., which have excellent optical characteristics and thermal stability [19]. However, the use of oxygen to prepare oxide or nitrogen oxide coatings can cause the oil in the vacuum pump to oxidize [17,20], reducing its pumping speed and service life, and even affecting product quality and production efficiency [21]. To improve this issue, under current equipment conditions, we use nitrides of transition metals as an oxygen-free coating.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Thermal Stability of Cu/TixSiyN/AlSiN Solar Selective Absorbing Coating

Zhang

et al. 2020

Materials

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An oxygen-free solar selective absorbing coating of Cu/TixSiyN/AlSiN was prepared on a Cu buffered stainless steel substrate by magnetron sputtering. This coating was prepared using a single target for each layer. A spectrophotometer, Fourier transform infrared spectrophotometer, scanning electron microscopy, X-ray diffractometer and atomic force microscopy were used to characterize the optical properties, crystalline structure, morphology and composition of these coatings. The coating of Cu/TixSiyN/AlSiN has good optical properties (average absorption of 0.941 and emittance of 0.058) and excellent thermal stability. The performance criterion (PC) is 0.0365, when the solar selective absorbing coating is heated in air at 200 °C for 1200 h.

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Optical simulation, characterization and thermal stability of Cr2O3/Cr/Cr2O3multilayer solar selective absorber coatings

Cited by 30 publications

References 25 publications

Effect of Chromium Trioxide Coating on the Thermal Performance of Solar Thermal Collector

Effect of Chromium Trioxide Coating on the Thermal Performance of Solar Thermal Collector

Spectrally selective coating of nanoparticles (Co₃O₄:Cr₂O₃) incorporated in carbon to captivate solar energy

Microstructure and Thermal Stability of Cu/TixSiyN/AlSiN Solar Selective Absorbing Coating

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Optical simulation, characterization and thermal stability of Cr2O3/Cr/Cr2O3multilayer solar selective absorber coatings

Cited by 30 publications

References 25 publications

Effect of Chromium Trioxide Coating on the Thermal Performance of Solar Thermal Collector

Effect of Chromium Trioxide Coating on the Thermal Performance of Solar Thermal Collector

Spectrally selective coating of nanoparticles (Co3O4:Cr2O3) incorporated in carbon to captivate solar energy

Microstructure and Thermal Stability of Cu/TixSiyN/AlSiN Solar Selective Absorbing Coating

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Product

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Spectrally selective coating of nanoparticles (Co₃O₄:Cr₂O₃) incorporated in carbon to captivate solar energy