Core-shell particles for devising high-performance full-day radiative cooling paint

Huang, Jie; Li, Mingzhang; Fan, Desong

doi:10.1016/j.apmt.2021.101209

Cited by 54 publications

(41 citation statements)

References 33 publications

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“…As a result, the application scenarios for these materials are limited. Various metal oxide materials, such as titanium dioxide (TiO 2 ), zinc oxide (ZnO), and zirconium dioxide (ZrO 2 ), have been used to replace the metal reflective layer to reflect sunlight owing to their high refractive indexes and shielding effects toward ultraviolet light. − However, owing to the moderate electron bandgap of these metal oxides, strong solar absorption in the ultraviolet band restricts the radiative cooling performance. To solve these problems, researchers have proposed the use of calcium carbonate (CaCO 3 ), barium sulfate (BaSO 4 ), alumina (Al 2 O 3 ), silica (SiO 2 ), and other high-energy bandgap materials such as reflective or emission layers to reduce the absorption of solar radiation heat. − In 2020, Li et al used high electron bandgap CaCO 3 fillers with a wide size distribution and a high particle concentration of 60%.…”

Section: Introductionmentioning

confidence: 99%

Daytime Radiative Cooling Coating Based on the Y₂O₃/TiO₂ Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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Daytime radiative cooling technology can release heat into outer space without consuming any electricity during the day while reflecting as much solar radiation as possible. This characteristic gives radiative cooling materials considerable application potential in the fields of energy-saving buildings, fabrics, and photovoltaic cells. The radiative cooling coating (RC coating) applied to a building should cover a large area of the building surface, so a RC coating was prepared by spraying. The RC coating consisted of highly near-infrared reflective yttrium oxide (Y2O3), titanium dioxide (TiO2), and polydimethylsiloxane (PDMS). The RC coating could reach a high solar reflectance of 92.2% and a high atmospheric window emissivity of 94.9%. The complementary reflectivity of TiO2 and Y2O3 was the key to obtaining high reflectivity for RC coatings. The results of field tests showed that the cavity where the RC coating is cooled was 7.7 °C lower than the ambient temperature under direct sunlight. Moreover, the average radiative cooling power of the RC coating was 72.5 W/m2 on a hot summer day. In addition, the RC coating has good stability and thus can be used in various conditions, such as on outdoor buildings.

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Section: Introductionmentioning

confidence: 99%

Daytime Radiative Cooling Coating Based on the Y₂O₃/TiO₂ Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings

Wang

et al. 2022

ACS Appl. Mater. Interfaces

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“…A is the area of glass plates, and h is the convective heat transfer coefficient. Also, the relationship between convective heat transfer coefficient ( h ) and wind speed ( v ) is h = 8.3 + 2.5 v where R 2 means the thermal resistance in virtue of air gap, L is the distance between the upper and lower glass plates, and k air is the thermal conductivity of air, the value of which is 0.0267 W·m –1 ·K –1 …”

Section: Methodsmentioning

confidence: 99%

“…Though air-conditioning is a prevalent solution to satisfy the requirement, , the demand for electricity greatly increases because of the extensive use of air-conditioning; worse yet, it produces vast quantities of greenhouse and ozone-depleting gases, causing global warming . Fortunately, radiative cooling technologies are an attractive solution for reducing building energy consumption by providing a path to dissipate heat from buildings through the atmospheric transmittance window (ATW, 8–13 μm) into ultracold universe in the absence of energy input. − …”

Section: Introductionmentioning

confidence: 99%

Switchable Radiative Cooling from Temperature-Responsive Thermal Resistance Modulation

Zhang

Huang

Fan

2022

ACS Appl. Energy Mater.

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Maintaining indoor temperature in a suitable range is necessary for modern buildings. Although radiative cooling is efficient for keeping cool in hot weather, it fails to block heat removal in cold weather. Here, we presented a conceptual design of a switchable radiative cooler (SRC) composed of a radiative cooling coating (RCC) and a temperature responsive part (TRP). Relying on the low thermal resistance state in hot weather, the SRC can conduct internal heat to external RCC for dissipation while automatically switching to a high thermal resistance state in chilly weather, inhibiting the indoor heat removal. Theoretically, we revealed that the SRC can achieve remarkable benefit with a temperature drop of 11 K at warm daytime (ON state) and a temperature rise of 4 K at cold nighttime (OFF state) for a designed building model. The results experimentally demonstrated that the SRC can adaptively regulate the radiative cooling performance of the building model and thus keep the interior thermal comfort. This design may open the pathway for developing switchable radiative cooling systems with zero power input.

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“…For instance, Huang et al recently developed the PMMA-based porous coolers embedding with core-shell particles including SiO 2 core and willemite shell. [97] The results indicated that core-shell particle embedding coolers can achieve the ultrahigh solar reflectivity of ≈96%, significantly higher than that with only ZnO or SiO 2 ones For high infrared-emission matrix materials, micro-nanoparticles are mainly used to enhance solar reflection, while for low infraredemission materials (e.g., polyethylene), particle embedding can simultaneously endow the benefit for the improvement of solar reflectance and infrared emission. Zhou et al recently employed 3D printing method to develop the scalable and lowcost cooling materials with SiO 2 particle embedding in nanoporous PE films, which can significantly reduce materials cost, compared with fluoropolymer-based counterparts.…”

Section: White Films For Daytime Coolingmentioning

confidence: 99%

Micro‐Nano Porous Structure for Efficient Daytime Radiative Sky Cooling

Liu

Tang

Jiang

et al. 2022

Adv Funct Materials

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CO 2 in 2050. [5] Due to the second law of thermodynamics, cooling is generally more challenging than heating. Conventional vapor-compression cooling not only results in excessive energy consumption, accelerating the depletion of fossil fuels, but also degrades the atmospheric ozone, leading to notorious environmental issues. Therefore, developing novel and pollutionfree cooling technology has become an urgent demand in the following decades.Radiative sky cooling (RSC) can harvest the coldness of the universe via the 8-13 µm atmospheric window without any pollution and energy consumption, which has witnessed great progress in the last few years. [6][7][8] Since the first demonstration of daytime radiative cooling via multilayer photonic structure by Fan and co-workers in 2014, this facile cooling technology has drawn worldwide attention. [9,10] With the joint efforts, RSC technology has achieved striking advances in building cooling, [4,11] photovoltaic cooling, [12][13][14] cryogenic cooling, [15,16] RSC driving thermoelectricity, [17][18][19] atmospheric water harvesting, [20,21] personal thermal management [3,22,23] and wearable devices. [24][25][26] For building cooling, the pioneering reports by Goldstein et al. and Zhao et al. have demonstrated that building-integrated RSC modules can provide continuous day-and-night cooling and can potentially save 32%-45% of the electricity consumption for cooling in summer. [4,11] For photovoltaic cooling, selective photonic cooler can lower the temperature of solar panels by over 5.7 K and afford the greater cooling

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Core-shell particles for devising high-performance full-day radiative cooling paint

Cited by 54 publications

References 33 publications

Daytime Radiative Cooling Coating Based on the Y₂O₃/TiO₂ Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings

Daytime Radiative Cooling Coating Based on the Y₂O₃/TiO₂ Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings

Switchable Radiative Cooling from Temperature-Responsive Thermal Resistance Modulation

Micro‐Nano Porous Structure for Efficient Daytime Radiative Sky Cooling

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Core-shell particles for devising high-performance full-day radiative cooling paint

Cited by 54 publications

References 33 publications

Daytime Radiative Cooling Coating Based on the Y2O3/TiO2 Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings

Daytime Radiative Cooling Coating Based on the Y2O3/TiO2 Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings

Switchable Radiative Cooling from Temperature-Responsive Thermal Resistance Modulation

Micro‐Nano Porous Structure for Efficient Daytime Radiative Sky Cooling

Contact Info

Product

Resources

About

Daytime Radiative Cooling Coating Based on the Y₂O₃/TiO₂ Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings

Daytime Radiative Cooling Coating Based on the Y₂O₃/TiO₂ Microparticle-Embedded PDMS Polymer on Energy-Saving Buildings