Radiative cooling with multilayered periodic grating under sunlight

Dai, Yanjun; Zhang, Zhijian; Ma, Chunyang

doi:10.1016/j.optcom.2020.126231

Cited by 26 publications

(8 citation statements)

References 28 publications

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“…Infrared emissive power is an important factor in radiative cooling performance, which depends on the cooler temperature and its infrared emissivity according to the blackbody radiative law . An indoor experiment was performed to compare the cooling performance of colored radiative cooler at different temperatures (Figure A).…”

Section: Generation and Modulation Of Structural Color Based On Inter...mentioning

confidence: 99%

Photonic-Structure Colored Radiative Coolers for Daytime Subambient Cooling

Zhang

Wang

et al. 2022

Nano Lett.

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Daytime subambient radiative cooling provides a powerful strategy for realizing sustainable thermal management without any external energy consumption. However, in practical situations a dazzling white or silver appearance is undesirable for aesthetic and functional reasons. Therefore, developing colored radiative cooling materials is greatly significant for more potential applications but remains a big challenge so far. Here, we reported a flexible colored radiative cooler based on interferometric retroreflection-induced structural color, which resolves the conflict between a colorful appearance for aesthetics and high solar reflection for cooling. All colored radiative coolers achieve subambient cooling of 4 K even under sunshine stronger than 1000 W/m 2 , while the same color commercial paints are 9−27 K higher than the ambient. Such a flexible, scalable, and low cost colored radiative cooler is expected to replace commercial paint in a practical scenario with aesthetic and cooling requirements, enabling substantial reduction in carbon emission and energy consumption.

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Section: Generation and Modulation Of Structural Color Based On Inter...mentioning

confidence: 99%

Photonic-Structure Colored Radiative Coolers for Daytime Subambient Cooling

Zhang

Wang

et al. 2022

Nano Lett.

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“…Due to the complex characteristics of atmospheric radiation, empirical or semiempirical formulas are commonly used to describe atmospheric radiation. Here, t(λ) is the atmospheric transmittance in the zenith direction, 28 which is closely related to atmospheric parameters, such as atmospheric water content, aerogel conditions, cloud coverage, and so on.…”

Section: Design Of Pc and R-pc Filmmentioning

confidence: 99%

Enhancing radiative cooling performance for bifacial photovoltaic module using two kinds of polycarbonate films

et al. 2022

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.Radiative cooling, as a cooling method that does not consume any energy during operation, has become a hot topic in recent years. Unlike passive daytime radiative cooling in buildings, radiative coolers used in photovoltaic modules must also have high light transmittance, which undoubtedly makes relevant research more difficult. Currently, bifacial photovoltaic modules are widely available on the market, if traditional cooling methods are employed in the back of them, including passive cooling such as heat sink and active cooling such as air cooling and water cooling, it will block the rear irradiance into the module. Hence, radiative cooling is an excellent solution. In this paper, polycarbonate (PC) film and one composed with a high reflective layer are proposed. The former has high emissivity in the atmospheric window and the latter has high reflectivity in the near-infrared band. Both achieve a good cooling effect without affecting the normal operation of the module. We also prepared the reflective film on PC by magnetron sputtering, and its optical characteristics were also measured and compared with simulation results. We innovatively use PC material and combine the reflective film with quite simple structure. Compared with other research results, they are simpler and stabler film structures and have the advantages of low cost, easy installation, good cooling effect, and can be directly pasted on the surface of the photovoltaic module. It turns out that the cooling effect can reach 6.02°C with R-PC film and photoelectric conversion efficiency can be improved by 0.27% with PC film when hc = 20 W · m − 2 · K − 1 and Ta = 27 ° C. Given its excellent performance, they have a broad application prospect in the daytime passive radiative cooling of bifacial photovoltaic modules.

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“…Heat dissipation from the earth's surface through deep space is significantly large enough to keep the surface temperature below ambient even under direct sunlight. Radiative cooling materials have experienced gradual growth since 2000, and can be classified into four main classes: dielectric multilayers [17][18][19][20] organic-inorganic composites [21][22][23], porous polymers [24][25][26], and metamaterials [27][28][29][30]. Polymers and dielectric materials have high emittance due to their low innate absorptance.…”

Section: Introductionmentioning

confidence: 99%

Radiative cooling surfaces: principles, performance evaluation and applications

Mohamadkhani¹

2023

futech

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With the crisis of greenhouse gases resulting in global warming, radiative cooling can assuage the need to keep cool without any adverse footprints. Radiative cooling is a heat transfer phenomenon in which entities dissipate heat directly into deep space without any effort or requiring input energy. It has been a well-known worldwide phenomenon for nocturnal heat transfer to dissipate heat into deep space. In recent years, however, its potential for cooling during the day leads to be considered as a possible method to mitigate the energy shortage, and it also can benefit the entire world's environment. Radiative cooling materials have leaped with the rapid advancement of nanotechnology. In this review paper, radiative cooling is comprehensively represented with regard to the principle of radiative cooling, energy balance, optimization, and various applications. In the first section, the basic principle of heat transfer mechanisms, which engage simultaneously in radiative cooling surface (RCS), are considered and elaborated. Then various approaches were surveyed to improve the performance of radiative cooling surfaces to outline possible pathways of its development in terms of cooling performance and commercial application. And finally, the application of RCS is discussed to explain the benefits of employing them. This review also makes it possible to researchers to develop the RCS for further upgrade, and the prospect of this subject reviews the major features in summary for further future studies.

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Radiative cooling with multilayered periodic grating under sunlight

Cited by 26 publications

References 28 publications

Photonic-Structure Colored Radiative Coolers for Daytime Subambient Cooling

Photonic-Structure Colored Radiative Coolers for Daytime Subambient Cooling

Enhancing radiative cooling performance for bifacial photovoltaic module using two kinds of polycarbonate films

Radiative cooling surfaces: principles, performance evaluation and applications

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