Effectiveness of perylene pigment on the reduction of energy demand of a building

Mazhar, Majid; Abdouss, Majid; Zarifi, Farhad; Zargaran, Mojdeh

doi:10.1108/prt-08-2019-0076

Cited by 7 publications

(5 citation statements)

References 10 publications

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“…The gain was 67% in samples with the original black system using the regulation layer (BCW vs. BSW), while in the grey system, the improvement was 123% without the regulation layer (GCG vs. GSG). The reflectance modification due to NIR reflectance was also verified in [7,16]. Figure 4a and Figure 4b present the reflectance spectral behaviour of the system after paint, respectively, for the UV-Vis and NIR regions.…”

Section: Emissivity and Reflectancementioning

confidence: 56%

NIR reflective Paints as an Alternative for Sustainable Façade Renovation

Souza,

Veloso,

Maia

et al. 2023

J. Phys.: Conf. Ser.

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Several studies of infrared reflective materials used on opaque envelopes have shown that their application can reduce the surface temperature and the cooling energy needs of buildings and help mitigate the urban heat island effect. Some of these studies were carried out by incorporating near-infrared (NIR) reflective materials on new buildings or as part of new construction systems, considering that one of the simpler and most used façade renovation methods is repainting. In a repainting process, the reflectance could change since the reflectance depends on the interaction between the reflective layer and the substrate. A study was carried out on the reflectance of paints with NIR reflective properties applied on the finishing coat of external thermal insulation composite systems (ETICS), simulating a façade renovation. A black NIR reflective paint was applied in one layer over the existing finishing coat of two ETICS samples: one with a grey mortar colour and another with a conventional black colour. A second configuration was considered by adding an intermediate layer of regularisation with white colour. Traditional black colour and the mortars were applied on a transparent acrylic base as a reference. The samples were assessed with a modular spectrophotometer to assess the total and NIR reflectance and the colour coordinates on the CIELab space. The results showed that the reflectance and colour of the new layer are independent of the colour or type of the first layer in the case of conventional paint. Conversely, the substrate affects the NIR paint performance, where a lighter substrate can help improve the reflectance but can also lead to a more significant colour change. Likewise, the results of the paint over a new white layer resulted in a lower reflectance compared to the reflectance of a single paint layer.

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Section: Emissivity and Reflectancementioning

confidence: 56%

NIR reflective Paints as an Alternative for Sustainable Façade Renovation

Souza,

Veloso,

Maia

et al. 2023

J. Phys.: Conf. Ser.

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“…NIR reflectance of three groups of BDI-, NDI-, and PDI-based compounds were measured to investigate the influence of the intrinsic molecular structure on their NIR reflectance behavior on a UV-Vis-NIR Lambda 950 instrument [20,33] (Figure 2). The wavelength from 700 nm to 1750 nm accounts for higher than 80% of the NIR solar energy for heat production [1]. Hence, the whole NIR reflectance spectrum was divided into two parts: 700-1750 nm and 1750-2500 nm and the average NIR reflectance of 700-1750 nm and 1750-2500 nm for BDI-, NDI-, and PDI-based compounds are summarized in Table 1.…”

Section: Resultsmentioning

confidence: 99%

“…Near-infrared (NIR) radiation (700-2500 nm) accounts for 52% of the solar energy from sunlight, and significantly contributes to the energy accumulation and temperature elevation of various man-made concrete buildings, which not only results in the urban heat island (UHI) effect, but also greatly increases the electricity energy consumption (i.e., cooling) [1][2][3][4]. Thus, it is highly desirable to address this issue through developing effective NIR reflective coating materials.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Intrinsic Factors Affecting the NIR Reflectance Based on Rylene Diimide Molecules

et al. 2021

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A clear understanding of the relationships between molecular structure and NIR reflectance (700–2500 nm) behavior is important and highly desirable for developing appropriate NIR-reflective materials to combat NIR heat radiation from sunlight. In this research, three groups of imide-based compounds have been adopted to investigate the influence of the intrinsic molecular structures on the NIR-reflective properties. It is found out that for the compounds with alkyl groups, the NIR reflectance will increase as the degree of the conjugated backbone increases, especially for the reflectance from 1750 nm to 2500 nm. In addition, despite that the alkyl or amine groups deteriorate the NIR reflectance, the NIR reflectance varies within a certain interval and the isomers with branched alkyl groups show identical or smaller NIR reflectance than those of isomers with linear alkyl groups. For different compounds, crystallinity seems to almost have no relationship with their NIR reflectance.

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“…LiDAR-detectable bilayer systems consist of NIR-transmittable perylene-derived dark-tone materials and a bottom white NIRreflective layer that includes titania (TiO 2 ). 8 However, this process requires complex industrial coating processes and the formulation of hydrophobic paint using organic solvents, which may cause environmental issues. 9,10 Some studies have also reported single-layered dark-tone NIR-reflective materials employing dark-colored metal oxides; however, these methods also suffer from low blackness and the use of heavy metals.…”

Section: ■ Introductionmentioning

confidence: 99%

“…To overcome these drawbacks, various organic and inorganic materials have been developed as LiDAR-detectable dark-tone materials, most of which are designed in a bilayer system. LiDAR-detectable bilayer systems consist of NIR-transmittable perylene-derived dark-tone materials and a bottom white NIR-reflective layer that includes titania (TiO 2 ) . However, this process requires complex industrial coating processes and the formulation of hydrophobic paint using organic solvents, which may cause environmental issues. , Some studies have also reported single-layered dark-tone NIR-reflective materials employing dark-colored metal oxides; however, these methods also suffer from low blackness and the use of heavy metals. , Thus, the demand increases for LiDAR-detectable black materials that require only a single coating process and are compatible with hydrophilic paint.…”

Section: Introductionmentioning

confidence: 99%

Designing Novel LiDAR-Detectable Plate-Type Materials: Synthesis, Chemistry, and Practical Application for Autonomous Working Environment

Jekal,

Otgonbayar,

Noh

et al. 2024

ACS Appl. Mater. Interfaces

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Plate-type hollow black TiO 2 (HL/BT) with a high NIR reflectance was fabricated for the first time as a LiDARdetectable black material. A TiO 2 layer was formed on commercialgrade glass by using the sol−gel method to obtain a plate-type structure. The glass template was then etched with hydrofluoric acid to form a hollow structure, and blackness was further achieved through NaBH 4 reduction, which altered the oxidation state of TiO 2 to black Ti x O 2x−1 or Ti 4+ to Ti 3+ and Ti 2+ . The blackness of the HL/BT material was maintained by a novel approach that involved etching prior to reduction. The thickness of the TiO 2 layer was controlled to maximize the NIR reflectance when applied as paint. The HL/BT material with a thickness of 140 nm (HL/ BT140) showed a blackness (L*) of 13.3 and high NIR reflectance of 23.6% at a wavelength of 905 nm. This is attributed to the effective light reflection at the interface created by the TiO 2 layer and the hollow structure. Plate-type HL/BT140 provides excellent spreadability, durability, and thermal stability in practical paint applications compared with sphere-type materials due to the higher contacting area to the applied surface, making it suitable for use as a LiDAR-detectable inorganic black pigment in autonomous environments.

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Effectiveness of perylene pigment on the reduction of energy demand of a building

Cited by 7 publications

References 10 publications

NIR reflective Paints as an Alternative for Sustainable Façade Renovation

NIR reflective Paints as an Alternative for Sustainable Façade Renovation

Insights into the Intrinsic Factors Affecting the NIR Reflectance Based on Rylene Diimide Molecules

Designing Novel LiDAR-Detectable Plate-Type Materials: Synthesis, Chemistry, and Practical Application for Autonomous Working Environment

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