A new approach to optimizing pigmented coatings considering both thermal and aesthetic effects

Baneshi, Mehdi; Maruyama, Shigenao; Nakai, H.; Komiya, Atsuki

doi:10.1016/j.jqsrt.2008.10.005

Cited by 64 publications

(28 citation statements)

References 22 publications

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“…Such unwanted heating increases the cooling loads for cities. 1) Solar radiation approximately consists of 5% UV radiation, 43% visible radiation and 52% NIR radiation (7802500 nm).…”

Section: Introductionmentioning

confidence: 99%

Influence of composition on near infrared reflectance properties of M-doped Cr2O3 (M=Ti,V) green pigments

Zhou

Weng

Yuan

et al. 2014

J. Ceram. Soc. Japan

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Ti-Al-V-doped Cr 2 O 3 green pigments could present a higher near-infrared (NIR) reflectance compared to pure Cr 2 O 3 . The amount of Ti and V introduced in the Cr 2 O 3 matrix has been systematically varied respectively, in order to evaluate the effects of Ti and V contents on the NIR properties of the doped Cr 2 O 3 . For comparison, experimental reflectance measurements and mean-NIR reflectance (7802000 nm) of samples are given. The results reveal significant variations in the NIR region as a function of nominal composition for both Ti-doped Cr 2 O 3 and V-doped Cr 2 O 3 . Moreover, the NIR reflectance of a Ti-Al-V-doped Cr 2 O 3 pigment sample was measured. It has been found that it exhibits lower NIR reflectance compared to that reported in previous study. The correlations between electronic structural and spectroscopic features are discussed. For the Ti-doped Cr 2 O 3 samples, the decrease of free carriers and the electronic transitions between defect energy levels within the band gap and the conduction band, could be responsible for the variable NIR reflectance. However, for V-doped Cr 2 O 3 , apart from light absorptions of free carriers, there are new light absorption peaks range from 1190 to 2000 nm, resulting in the variations of the NIR reflectance.

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“…Such unwanted heating increases the cooling loads for cities. 1) Solar radiation approximately consists of 5% UV radiation, 43% visible radiation and 52% NIR radiation (7802500 nm).…”

Section: Introductionmentioning

confidence: 99%

Influence of composition on near infrared reflectance properties of M-doped Cr2O3 (M=Ti,V) green pigments

Zhou

Weng

Yuan

et al. 2014

J. Ceram. Soc. Japan

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“…In our research group, a cool pigmented coating using controlled size submicron particles has been proposed [7]. The solar energy that reaches Earth's surface in the wavelength range from 0.3 to 2.5 μm is divided into three parts: the ultraviolet (UV) region (5%), VIS region (43%), and NIR region (52%) [8].…”

Section: Introductionmentioning

confidence: 99%

Control of thermal barrier performance by optimized nanoparticle size and experimental evaluation using a solar simulator

Gonome

Baneshi

Okajima

et al. 2014

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…1. Concept of a spectral selective coating To achieve this spectral behavior, the authors proposed making the coating on a black substrate with controlled size and concentration of pigment particles (5,6) . We introduced a parameter, R, as the ratio of solar reflected energy in the NIR region to the reflected energy in the VIS region weighted by the standard visual sensitivity of the human eye.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve an optimum coating, this parameter should be maximized. In previous works (5,6) , the white pigments such as TiO 2 , ZnO and Al 2 O 3 were optimized. Moreover, we optimized the dark red coatings pigmented with Fe 2 O 3 (7) .…”

Section: Introductionmentioning

confidence: 99%

The Effect of Dispersed State to Control of Radiative Properties of Coatings Pigmented with Nanoparticles

Gonome

Baneshi

Vaillon

et al. 2012

JTST

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This study describes nanoparticle pigmented coatings used in controlling the radiative properties of surfaces exposed to sunlight. The effect of particle dispersed state to reflectance of the coating is discussed. As the dispersed particles, TiO 2 and Fe 2 O 3 are used. From Raman spectral intensity measurements made on the coating, the dispersed state of particles was investigated. The spectral reflectance of the coating was measured by spectroscopy. The reflectivity of the coating is analyzed theoretically. In this calculation, the dispersed state is assumed to be monodispersed and homogeneous. Comparison between experimental and numerical results shows that the difference between the measured and calculated reflectance increases as the volume fraction increases. The maximum absolute error of reflectance is about 10% when the volume fraction is 0.05. In contrast, the maximum absolute error of reflectance is about 3% when the volume fraction is 0.01. The control of dispersed state affects the radiative properties of pigmented coatings.

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A new approach to optimizing pigmented coatings considering both thermal and aesthetic effects

Cited by 64 publications

References 22 publications

Influence of composition on near infrared reflectance properties of M-doped Cr<sub>2</sub>O<sub>3</sub> (M=Ti,V) green pigments

Influence of composition on near infrared reflectance properties of M-doped Cr<sub>2</sub>O<sub>3</sub> (M=Ti,V) green pigments

Control of thermal barrier performance by optimized nanoparticle size and experimental evaluation using a solar simulator

The Effect of Dispersed State to Control of Radiative Properties of Coatings Pigmented with Nanoparticles

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