Colored radiative cooling: How to balance color display and radiative cooling performance

Xi, Wang; Liu, Yida; Zhao, Weixian; Hu, Run; Luo, Xiaobing

doi:10.1016/j.ijthermalsci.2021.107172

Cited by 69 publications

(41 citation statements)

References 27 publications

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“…Although white radiative coolers usually present visual discomfort by specular reflection, light absorption in the visible spectrum is inevitable for colored coolers, which results in a reduced cooling performance under sunlight. [103] To simultaneously have a pleasant color and achieve efficient cooling performance, various color strategies that mitigate the solar absorption of colored PDRC Reproduced with permission. [98] Copyright 2018, Springer Nature.…”

Section: Discussionmentioning

confidence: 99%

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

Zhang

Wang

et al. 2022

Small Methods

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the terrestrial radiation with a temperature of ≈300 K at the Earth's surface is concentrated at wavelengths ranging from 2.5 to 50 µm. Meanwhile, the combined effects from all atmospheric components result in that the special atmospheric window between 8 and 13 µm that is highly transparent. Hence, most terrestrial areas can effectively radiate heat through the transparent atmospheric window to the cold universe to maintain a relatively stable temperature. To this end, radiative coolers should have high emissivity in the transparent atmospheric window (8-13 µm), which is transparent in this region and allows infrared (IR) light to pass through. In this regard, various materials and structures have been designed in the past few decades and have exhibited promising passive cooling performance at night. [8,9] However, during the daytime, the Sun heats the radiative coolers, which seriously compromises the cooling effect. To resolve this problem, the cooler should radiate more heat to the cold universe while reflecting sunlight to avoid solar heating. Fan and co-workers [10] first designed multilayer photonic materials and achieved daytime radiative cooling to a temperature below ambient conditions when subjected to direct sunlight. Since then, various materials have been demonstrated to realize subambient daytime radiative cooling and have shown great potential for practical applications. [11][12][13] Before some reviews have summarized these developments in radiative cooling, [14][15][16][17] but the limited net cooling power and instability of radiative cooling hinder its practical wide applications. In this review, by summarizing the state-of-the-art research and development in passive daytime radiative cooling (PDRC), we first propose three critical components for PDRC: 1) spectral design in the mid-IR range, 2) structure design for enhancing solar reflectance, and 3) thermal management. Second, we introduce various applications of PDRC, such as building cooling, solar cell cooling, water harvesting, clothing, and electricity generation (Figure 1). Finally, the remaining challenges and opportunities of PDRCs are also discussed. Fundamental Mechanisms of PDRC PDRC ConceptBased on Kirchhoff's law, an object with a temperature higher than 0 K continuously exchanges heat with other objects by absorbing Passive daytime radiative cooling (PDRC) is emerging as a promising cooling technology. Owing to the high, broadband solar reflectivity and high mid-infrared emissivity, daytime radiative cooling materials can achieve passive net cooling power under direct sunlight. The zero-energy-consumption characteristic enables PDRC to reduce negative environmental issues compared with conventional cooling systems. In this review, the development of advanced daytime radiative cooling designs is summarized, recent progress is highlighted, and potential correlated applications, such as building cooling, photovoltaic cooling, and electricity generation, are introduced. The remaining challenges and opportunities of PDRCs are also in...

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Section: Discussionmentioning

confidence: 99%

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

Zhang

Wang

et al. 2022

Small Methods

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“…Mid-infrared (5–30 µm) photonics have inspired a surge of applications, including quantum cascade lasers 76 , molecule sensors 77 , thermal camouflage 78 – 82 and radiative coolers 83 – 86 . In particular, research on RCs has attracted significant interest because it facilitates effective and passive (i.e.…”

Section: Thermal Radiation Devicesmentioning

confidence: 99%

High-index-contrast photonic structures: a versatile platform for photon manipulation

et al. 2022

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In optics, the refractive index of a material and its spatial distribution determine the characteristics of light propagation. Therefore, exploring both low- and high-index materials/structures is an important consideration in this regard. Hollow cavities, which are defined as low-index bases, exhibit a variety of unusual or even unexplored optical characteristics and are used in numerous functionalities including diffraction gratings, localised optical antennas and low-loss resonators. In this report, we discuss the fabrication of hollow cavities of various sizes (0.2–5 μm in diameter) that are supported by conformal dielectric/metal shells, as well as their specific applications in the ultraviolet (photodetectors), visible (light-emitting diodes, solar cells and metalenses), near-infrared (thermophotovoltaics) and mid-infrared (radiative coolers) regions. Our findings demonstrate that hollow cavities tailored to specific spectra and applications can serve as versatile optical platforms to address the limitations of current optoelectronic devices. Furthermore, hollow cavity embedded structures are highly elastic and can minimise the thermal stress caused by high temperatures. As such, future applications will likely include high-temperature devices such as thermophotovoltaics and concentrator photovoltaics.

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“…[22][23][24] To achieve the sub-ambient CDRCs, the effects of colorants on the solar reflectance and thermal emissivity must be considered. In contrast to the coloration by chemical dyes or pigments, the structural color can be realized by adopting inherently solar-transparent materials, introducing a less absorbed solar irradiance 25 . For an ideal CDRC with a subtractive primary color of yellow, the solar reflectance spectrum is presented in Figure 1A, together with the infrared absorptance/emittance spectrum.…”

Section: Theoretical Analysismentioning

confidence: 99%

Scalable Colored Sub-Ambient Radiative Coolers Based on a Polymer-Tamm Photonic Structure

et al. 2022

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Colored radiative cooling: How to balance color display and radiative cooling performance

Cited by 69 publications

References 27 publications

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

Recent Progress in Daytime Radiative Cooling: Advanced Material Designs and Applications

High-index-contrast photonic structures: a versatile platform for photon manipulation

Scalable Colored Sub-Ambient Radiative Coolers Based on a Polymer-Tamm Photonic Structure

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