Mechanically Switchable Multifunctional Device for Regulating Passive Radiative Cooling and Solar Heating

Tao, Shuang; Han, Jingtian; Xu, Ying; Fang, Zhenggang; Ni, Yaru; Fang, Liang; Lu, Chunhua; Xu, Zhongzi

doi:10.1021/acsami.2c21961

Cited by 13 publications

(3 citation statements)

References 47 publications

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“…In our previous works, the RC emitter with rare earth silicate was successfully fabricated . Herein, Al 2 O 3 particles were added.…”

Section: Resultsmentioning

confidence: 99%

Construction of a Robust Radiative Cooling Emitter for Efficient Food Storage and Transportation

Tao,

Cai,

Han

et al. 2024

ACS Appl. Mater. Interfaces

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Nowadays, food safety is still facing great challenges. During storage and transportation, perishable goods have to be kept at a low temperature. However, the current logistics still lack enough preservation ability to maintain a low temperature in the whole. Hence, considering the temperature fluctuation in logistics, in this work, the passive radiative cooling (RC) technology was applied to package to enhance the temperature control capability in food storage and transportation. The RC emitter with selective infrared emission property was fabricated by a facile coating method, and Al 2 O 3 was added to improve the wear resistance. The sunlight reflectance and infrared emittance within atmospheric conditions could reach up to 0.92 and 0.84, respectively. After abrasion, the sunlight reflection only decreased by 0.01, and the infrared emission showed a negligible change, revealing excellent wear resistance. During outdoor measurement, the box assembled by RC emitters (RC box) was proved to achieve temperature drops of ∼9 and ∼4 °C compared with the corrugated box and foam box, respectively. Besides, the fruits stored in the RC box exhibited a lower decay rate. Additionally, after printing with patterns to meet the aesthetic requirements, the RC emitter could also maintain the cooling ability. Given the superior optical properties, wear resistance, and cooling capability, the emitter has great potential for obtaining a better temperature control ability in food storage and transportation.

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“…In our previous works, the RC emitter with rare earth silicate was successfully fabricated . Herein, Al 2 O 3 particles were added.…”

Section: Resultsmentioning

confidence: 99%

Construction of a Robust Radiative Cooling Emitter for Efficient Food Storage and Transportation

Tao,

Cai,

Han

et al. 2024

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

show abstract

“…The temperature difference between the film and ambient (30 °C) in heating mode is up to 61.1 °C, and the subambient temperature drop is 5.8 °C in cooling mode when h c = 6 W/m 2 /K. In addition, compared with the traditional black heating mode, the maximum sunlight absorption rate of this color film is only 61.5%, but it makes the steady-state temperature higher than that of the traditional black structure, where the absorption of sunlight is about 100%. ,,, Compared to traditional coatings, the colored dual-mode film can save up to 10.3% of annual energy in the northern and southern temperate zones. This work can be expected to provide new insights and guidance for preparing high-performance color dual-mode RTM products.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic adjustment of cooling and heating can be realized by simple inversion. Tao et al . proposed a simple mechanical device that could switch between passive radiant cooling and solar heating modes.…”

Section: Introductionmentioning

confidence: 99%

Symmetric and Asymmetric Fabry–Pérot Cavity Design for a Dual-Mode Thermal Management Photonic Film with High-Purity Color

Nan,

Guo,

Yang

et al. 2024

Ind. Eng. Chem. Res.

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Radiative thermal management (RTM) is a sustainable and environmentally friendly strategy because it needs no external energy input and can reduce greenhouse gas emissions and thus recently has gained significant attention. However, the material color in existing radiative cooling/heating applications is traditionally white/black in order to maximize cooling/heating performance, which limits their practical application range. Herein, we propose a symmetric and asymmetric Fabry–Pérot cavity structure to fabricate a polymer-based photonic dual-mode thermal management film with a high-purity structural color display. The film can be adjusted as needed to produce a colored appearance with different hues while simultaneously maintaining sufficient radiative cooling power. The cooling side of the color dual-mode photon film exhibits high solar reflectivity (92.1%) and infrared emissivity (96.0%). Therefore, the maximum radiative cooling effect in the daytime subenvironment reaches 5.8 °C, and the maximum theoretical cooling power is high up to 62.6 W/m2. Meanwhile, the heating side of the dual-mode film features a very low infrared emissivity (8.2%) and a high solar absorption rate (61.5%), and its radiative heating capacity reaches 61.1 °C. Compared with traditional coatings, the colored dual-mode film can save up to 10.3% of annual energy in the northern and southern temperate zones. The color dual-mode photon film can easily switch between cooling and heating modes by flipping to adapt to dynamic cooling and heating scenarios, which is of great significance for alleviating the greenhouse effect and promoting sustainable development.

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Photochromic Thermoelectric Smart Window for Season‐Adaptive Solar Heat and Daylight Management

Meng,

Kragt,

et al. 2024

Adv Funct Materials

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Photochromic smart windows have drawn increasing attention as an approach to improve building energy efficiency and enhance indoor daylight comfort. However, existing photochromic smart windows still block sunlight from entering the room on sunny winter days, causing additional energy consumption for heating. Herein, a dual‐mode smart window is designed with decoupled photo and thermal functions by combining colorless Fe‐doped WO3 photochromic film with window rotation. Based on this, selective heating and cooling of the room between winter and summer is achieved while maintaining the daylight comfort benefits during all seasons. As a proof of concept, the smart window reduces the temperature of a model house by up to 7.9 °C in summer mode, while in winter mode the temperature is only reduced by 0.7 °C. The proposed seasonally adaptive dual‐mode smart window obtains by window rotation overcomes the limitations of conventional photochromic smart windows, which not only achieves better energy efficiency but also retains improved daylight comfort. Furthermore, it demonstrates that the heat absorbed by the smart window can be harnessed to produce electricity through the integration of thermoelectric modules within the glazing, which enhances its impact on reducing energy consumption.

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Mechanically Switchable Multifunctional Device for Regulating Passive Radiative Cooling and Solar Heating

Cited by 13 publications

References 47 publications

Construction of a Robust Radiative Cooling Emitter for Efficient Food Storage and Transportation

Construction of a Robust Radiative Cooling Emitter for Efficient Food Storage and Transportation

Symmetric and Asymmetric Fabry–Pérot Cavity Design for a Dual-Mode Thermal Management Photonic Film with High-Purity Color

Photochromic Thermoelectric Smart Window for Season‐Adaptive Solar Heat and Daylight Management

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