Investigating performance prediction and optimization of spectral solar reflectance of cool painted layers

Kinoshita, Shinichi; Yoshida, A.

doi:10.1016/j.enbuild.2015.06.072

Cited by 15 publications

(5 citation statements)

References 18 publications

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“…It is widely accepted [24][25][26] that the optical properties and the scattering ability of the cool coated surface is mainly affected by the particle size and the refractive index of the oxides combined on layers coating [27,28]. Therefore, several studies were carried out to optimize the use of nanoparticles in cool coatings.…”

Section: Introductionmentioning

confidence: 99%

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

et al. 2021

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Near-infrared (NIR) reflective materials are being developed for mitigating building cooling needs. Their use contributes to broadening the range of colours, responding to the urban aesthetic demand without compromising the building performance. Despite the increase in NIR reflective pigments investigation, there is still a knowledge gap in their applicability, impact, and durability in multilayer finishing coatings of External Thermal Insulation Composite Systems (ETICS). Hence, the main goal of this work consists of evaluating the impact of incorporating NIR reflective pigments (NRP) in the solar reflectance of the surface layer of ETICS, without affecting the colour perception, as well as their influence on the colour durability and surface temperature. As such, colour, solar reflectance, and surface temperature were monitored for 2 years in dark-coloured specimens of ETICS, with and without NRP and a primer layer. It was confirmed that the main contribution of NRP is the increase of solar reflectance and, consequently, the decrease in surface temperature, especially for high exterior temperatures (around 30 ºC). Moreover, these pigments highly increase the NIR reflectance without affecting the visible colour. In addition, they contribute to maintaining the colour characteristics. The application of primer increased the surface temperature, especially for higher exterior temperatures. However, it contributes to a lower colour difference and solar reflectance variation, which is an important achievement for durability purposes.

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Section: Introductionmentioning

confidence: 99%

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

et al. 2021

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“…This is because the difference in refractive index between CaCO 3 particles and PVC matrix brings about good scattering property of PVC/CaCO 3 composite films, which also makes samples have good diffuse reflection property. [ 37 ] Furthermore, the reflectance of PVC/CaCO 3 composite films at UV region rises sharply, on account of the good reflection performance of CaCO 3 powder at UV region. This property of CaCO 3 powder can effectively reduce the damage to polymer matrix caused by UV radiation, which is beneficial to prolong the service life of composites.…”

Section: Resultsmentioning

confidence: 99%

CaCO₃ as a new member of high solar‐reflective filler on the cooling property in polymer composites

Tao

Mao

Yang

et al. 2020

Vinyl Additive Technology

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Calcium carbonate (CaCO3) is the most commonly used inorganic filler in polymer materials to improve the mechanical properties and reduce the costs. However, there are few reports on the preparation of cooling materials using CaCO3. In this study, CaCO3 was introduced into the polymer matrix as a solar reflective filler to prepare passive cooling materials. Specifically, the influences of CaCO3 content on the structure and performances of polyvinyl chloride (PVC)/CaCO3 composite films were characterized by scanning electron microscope (SEM), contact angle test, surface roughness and glossiness, solar reflectivity, thermal emissivity, temperature test and mechanical property characterization. When the volume fraction of CaCO3 reaches 67%, the total solar reflectance of PVC/CaCO3 composite films is 80.8%, which is 351.4% higher than that of PVC films. CaCO3 powder has little influence on the thermal emissivity of the atmospheric window (3‐5 μm and 8‐13 μm) of the composite films, which remains at a high level about 0.86. In temperature test, the final temperature of sample 67 v% is only 26.8°C, which is only 2.8°C higher than the room temperature and 22.2°C lower than that of PVC films. For comparison, the cooling performance of PVC/titanium dioxide (TiO2) composite films with 10 v% TiO2 was also measured, and the final temperature is 29.1°C, even 2.3°C higher than that of PVC/CaCO3 composite films with 67 v% CaCO3. In this study, the cost‐effective and solar‐reflective PVC/CaCO3 composites have potential application in cooling material field.

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“…For the shotcrete systems at high latitudes a low concentration reflector system is used. A wide range of paints are suitable to apply to the shotcrete that will act as a low concentration reflector while scattering the light (Kinoshita & Yoshida, 2016;De Masi et al, 2018). This includes solar reflectant self-cleaning paint that will improve both mechanical durability and albedo (Wang et al, 2020).…”

Section: Design Technical Constraintsmentioning

confidence: 99%

Geographic potential of shotcrete photovoltaic racking: Direct and low-concentration cases

Hollman

Pearce

2021

Solar Energy

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Investigating performance prediction and optimization of spectral solar reflectance of cool painted layers

Cited by 15 publications

References 18 publications

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

CaCO₃ as a new member of high solar‐reflective filler on the cooling property in polymer composites

Geographic potential of shotcrete photovoltaic racking: Direct and low-concentration cases

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Investigating performance prediction and optimization of spectral solar reflectance of cool painted layers

Cited by 15 publications

References 18 publications

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

Impact of Incorporating NIR Reflective Pigments in Finishing Coatings of ETICS

CaCO3 as a new member of high solar‐reflective filler on the cooling property in polymer composites

Geographic potential of shotcrete photovoltaic racking: Direct and low-concentration cases

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CaCO₃ as a new member of high solar‐reflective filler on the cooling property in polymer composites