Bio-inspired structure using random, three-dimensional pores in the polymeric matrix for daytime radiative cooling

Yang, Zhangbin; Sun, Haoxuan; Xi, Yunfei; Qi, Yanli; Mao, Zepeng; Wang, Ping; Zhang, Jun

doi:10.1016/j.solmat.2021.111101

Cited by 39 publications

(22 citation statements)

References 34 publications

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“…With Besides, the MB-PP is the two-phase porous structure, and the air pores significantly influence not only the solar reflectance but also the thermal emittance. 13 Based on our previous investigation, the large interconnective air porous structure could lower the thermal emittance. In general, for passive radiative cooling materials, the solar reflectance and the thermal emittance must be as high as possible.…”

Section: Resultsmentioning

confidence: 98%

“…According to the primary structure −CH 2 –CH(CH 3 )– of PP, the PP is composed of only C–C and C–H bonds, whose absorption in the thermal region is weak. Besides, the MB-PP is the two-phase porous structure, and the air pores significantly influence not only the solar reflectance but also the thermal emittance . Based on our previous investigation, the large interconnective air porous structure could lower the thermal emittance.…”

Section: Results and Discussionmentioning

confidence: 99%

“…The energy saving simulation with different boundaries was based on the software EnergyPlusV8.7.0, 24 and a 3.6 × 3.6 × 3.7 m residential building with a 2 × 0.9 m door and a 0.8 × 0.8 m window was adopted for the simulation (the detailed information of the residential building could be seen in our previous work. 13 ). Besides, the MB-PP or SMB-PP film is attached to the exterior wall of the building by the binder or physical means.…”

Section: Methodsmentioning

confidence: 99%

“…To find out just how the natural creatures could spontaneously decrease the body temperature, researchers have carried out experiments to explore the mechanism of their thermal regulation instinct. Over the past few years, researchers reported that some natural creatures possess distinctive photonic structures for thermal regulation. − On the one hand, their distinctive photonic structures usually give them the structural white or silver color for reflecting the sunlight and minimizing the heat gain. On the other hand, the structures are made of organic matter which has a high thermal emittance, and then, the microstructures could further enhance the thermal emittance for maximizing the heat loss.…”

Section: Introductionmentioning

confidence: 99%

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Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

Yang

Zhang

2021

ACS Appl. Mater. Interfaces

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Without the help of compression-based cooling systems, natural creatures have to make use of other things to decrease their body temperature to survive under thermally harsh conditions. This work finds that the silkworm cocoon of Bombyx mori protects pupae from the rapid temperature fluctuations via the randomly stacked silk fibers, which possess high solar reflectance and thermal emittance for thermal regulation. Inspired by this microstructure, the melt-blown polypropylene (MB-PP) with randomly stacked fibers is fabricated by a large-scale melt-blown fabrication method. For enhancing the thermal emittance of MB-PP, the surface-modified MB-PP (SMB-PP) is obtained by constructing the poly(dimethylsiloxane) film on the MB-PP. As the reason for its high solar reflectance (∼95%) and thermal emittance (∼0.82), the SMB-PP displays subambient temperature drops of 4 °C in the daytime and 5 °C in the nighttime, respectively. Moreover, building energy simulation indicates that the SMB-PP could save ∼132 GJ (∼58.1% of the baseline energy consumption) for 1 year in the contiguous United States. Overall, the bioinspired structures offer a novel pathway out of cooling buildings, showing great promising application prospects in zero-energy buildings.

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Section: Resultsmentioning

confidence: 98%

Section: Results and Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

Yang

Zhang

2021

ACS Appl. Mater. Interfaces

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“…Passive daytime radiative cooling (PDRC) has emerged as a highly appealing technique that offered a sustainable way without an additional energy input to cool objects. , It could simultaneously reflect solar energy in the ultraviolet visible–near infrared (UV–Vis–NIR) wavelength range (0.3–2.5 μm) and send heat into the cold universe through the atmospheric long-wave infrared transparency window (8–13 μm). , At present, the radiative cooling works reported have basically achieved a good effect that can effectively cool the objects in hot summer. − However, most of the radiative cooling materials reflect and radiate heat all year round, which saves energy in summer but increases energy consumption in winter.…”

Section: Introductionmentioning

confidence: 99%

A Superhydrophobic Dual-Mode Film for Energy-Free Radiative Cooling and Solar Heating

et al. 2022

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Traditional electric cooling in summer and coal heating in winter consume a huge amount of energy and lead to a greenhouse effect. Herein, we developed an energy-free dual-mode superhydrophobic film, which consists of a white side with porous coating of styrene-ethylene-butylene-styrene/SiO 2 for radiative cooling and a black side with nanocomposite coating of carbon nanotubes/polydimethylsiloxane for solar heating. In the cooling mode with the white side, the film achieved a high sunlight reflection of 94% and a strong long-wave infrared emission of 92% in the range of 8–13 μm to contribute to a temperature drop of ∼11 °C. In the heating mode with the black side, the film achieved a high solar absorption of 98% to induce heating to raise the air temperature beneath by Δ T of ∼35.6 °C. Importantly, both sides of the film are superhydrophobic with a contact angle over 165° and a sliding angle near 0°, showing typical self-cleaning effects, which defend the surfaces from outdoor contamination, thus conducive to long-term cooling and heating. This dual-mode film shows great potential in outdoor applications as coverings for both cooling in hot summer and heating in winter without an energy input.

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Temperature‐Sensitive Colored Radiative Cooling Materials with Efficient Cooling Performance

et al. 2022

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Several daytime radiative cooling materials involving various structures and composed using multilayer thin films, polymers, and nanoparticles have been fabricated and studied. However, their surface is of white or some other monotonous color because of the requirement for most of the incident sunlight to be reflected. A temperature‐sensitive colored radiative cooling (TCRC) material that provides efficient cooling while preserving the aesthetic properties of the surface has been developed. The TCRC material is manufactured as a bilayer structure for efferent cooling applied on a colored radiative cooling emitter. The bottom layer reflects as much light as possible using polyvinylidene fluoride and alumina particles, and the top layer uses a thermochromic color pigment to display color. The optical properties of the TCRC material, in response to temperature changes, are evaluated and its efficient cooling ability is confirmed. The temperature cooling is confirmed for TCRC emitters of yellow, magenta, and blue colors, using an outdoor temperature measurement system, and it is experimentally confirmed that the TCRC emitters provide more cooling (by 1.75, 2.67, and 4.31 °C, respectively) than conventional paint of the same color.

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Bio-inspired structure using random, three-dimensional pores in the polymeric matrix for daytime radiative cooling

Cited by 39 publications

References 34 publications

Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

Bioinspired Radiative Cooling Structure with Randomly Stacked Fibers for Efficient All-Day Passive Cooling

A Superhydrophobic Dual-Mode Film for Energy-Free Radiative Cooling and Solar Heating

Temperature‐Sensitive Colored Radiative Cooling Materials with Efficient Cooling Performance

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