Cooling Performance of TiO2-Based Radiative Cooling Coating in Tropical Conditions DOI Creative Commons
Bhrigu Rishi Mishra,

Sreerag Sundaram,

Karthik Sasihithlu

et al.

ACS Omega, Journal Year: 2024, Volume and Issue: 9(50), P. 49494 - 49502

Published: Dec. 4, 2024

The cooling power of radiative (RC) coatings depends not only on the properties coating but also environmental variables. In tropical environments, performance RC deteriorates due to high humidity and solar radiation. Previous studies focused developing solar-reflective achieve subambient in environments. However, these have demonstrated ability be used at a large scale, mainly their cost or less durability. Herein, we test an paint composed TiO2 polydimethylsiloxane (PDMS) three different cities with moderate levels. Though significant reduction internal temperature paint-coated aluminum (Al) box is observed, compared uncoated Al box, both achieved. A comprehensive analysis conducted clarify reasons behind inability attain cooling.

Language: Английский

Machine Learning-Driven Scattering Efficiency Prediction in Passive Daytime Radiative Cooling DOI Creative Commons
Changmin Shi,

Jiayu Zheng,

Ying Wang

et al.

Atmosphere, Journal Year: 2025, Volume and Issue: 16(1), P. 95 - 95

Published: Jan. 16, 2025

Passive daytime radiative cooling (PDRC) has emerged as a promising, electricity-free approach that reflects sunlight while radiating heat through the atmospheric transparent window. However, design and optimization of PDRC materials remain challenging, requiring significant time resources for experimental numerical modeling efforts. In this work, we developed machine learning (ML)-driven to predict scattering efficiency in wavelength 0.3–2.5 μm, with aim eventually optimizing microstructural materials. By employing ML models such linear regression, neural networks, random forests, aimed optimize across different pore sizes mixed-pore-size configurations. As result, forest model demonstrated superior prediction performance minimal error, effectively capturing complex, non-linear interactions between material features. We also leveraged data transformation techniques one-hot encoding generative predictions The presented ML-driven platform serves valuable open resource researchers, facilitating rapid cost-effective accelerating development sustainable technologies.

Language: Английский

Citations

1

Hierarchically Micro- and Nanostructured Polymer via Crystallinity Alteration for Sustainable Environmental Cooling DOI
Changmin Shi, Seung‐Hyun Kim, Natalie Warren

et al.

Langmuir, Journal Year: 2024, Volume and Issue: unknown

Published: Sept. 9, 2024

Cooling environments are a pervasive need in our society, with conventional air conditioners being the most popular approach. However, rely heavily on electricity and Freon, chemical that depletes ozone contributes to greenhouse gas effects. To address this issue, passive daytime radiative coolers (PDRCs) have been proposed achieve cooling by simultaneously reflecting sunlight allowing internal heat escape without electricity. Despite their potential, high-performance PDRCs composed of thick polymer films, which increases material costs during PDRC preparation limits thermal transport. In work, we introduced an economical scalable solvent evaporation-based method prepare relatively thin hierarchically micro- nanostructured poly(vinylidene fluoride-trifluoroethylene) via crystallinity alteration. Particularly, find key generating nanosized pores is remove water residual within film sample annealing, significantly enhances scattering efficiency across solar spectrum. With design, demonstrate effective outdoor environment, achieving temperature Δ2.5 °C, thickness only 215 μm. Furthermore, model suggested applying could lead annual energy savings up ∼39% warmer climates country 715 GJ nationwide. Developing reduced thickness, such as one discussed here, imperative for implementing sustainable solutions reducing carbon footprint.

Language: Английский

Citations

7

Hierarchically Engineered Polymer Composite with Dual-Scatter Structure for Enhanced Passive Radiative Cooling DOI
Hyun‐Ho Park, Bo Sun Joo, Gumin Kang

et al.

Journal of Materials Chemistry A, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A nanostructured perfluoropolymer paint with high solar reflectance and selective infrared emittance has been developed, highlighting the importance of optimizing chemical structure polymer binder for radiative cooling.

Language: Английский

Citations

0

Advances in smart textiles for personal thermal management DOI Creative Commons
Weibin Zhu, Lung Chow,

D. Ye

et al.

Med-X, Journal Year: 2025, Volume and Issue: 3(1)

Published: March 3, 2025

Language: Английский

Citations

0

Adhesive Hydrogel Paint for Passive Heat Dissipation via Radiative Coupled Evaporation Cooling DOI Open Access
Qin Ye,

D. D. Chen,

Ziying Zhao

et al.

Small, Journal Year: 2025, Volume and Issue: unknown

Published: March 10, 2025

Passive cooling technologies have shown great interest recently due to their free electricity, especially for radiative (RC), and evaporation (EC). While single-mode passive is often limited by environmental conditions, such as sunlight, clouds, humidity, resulting in a performance. To address these issues, an adhesive hydrogel paint designed heat dissipation the daytime or high workload via coupled (REC), which also can realize water self-replenishment at night low RC-assisted adsorption moisture capture. Solar reflectance R¯solar${{\bar{R}}_{{\mathrm{solar}}}}$ = 0.91 thermal emittance ε¯LWIR${{\bar{\varepsilon }}_{{\mathrm{LWIR}}}}$ 0.94 are obtained RC. Excellent performance be achieved painting it on 3D W-shaped substrate. Compared with flat RC paint, REC W-shape substrate achieves temperature drop of 5.4 °C heating density 100 W m-2, further increased 11.4 400 m-2 multi-passive strategies. This structural material design provides potential outdoor dissipation.

Language: Английский

Citations

0

Transparent Solar Thermal Metasurface for Efficient Anti‐Icing/Deicing and Indoor Light Management DOI Open Access
Fei Zhang,

Baojian Yao,

Min Song

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 16, 2025

Abstract Transparent roofs, such as greenhouse films and architectural glass, play a critical role in optimizing lighting reducing energy consumption. However, conventional solutions are hindered by challenges, frost accumulation winter glare or overheating summer. Here, multi‐functional transparent solar thermal metasurface (TSTM) is presented that integrates anti‐icing/deicing functionality with indoor light management. The TSTM achieves visible transmittance of 0.731, diffusing over 90% the transmitted to enhance comfort. Furthermore, performance enabled high ultraviolet (0.660) near‐infrared (0.724) absorptance, low mid‐infrared emittance (0.371). Its multi‐scale surface superhydrophobic (contact angle: 160.8°) ensure spontaneous dewetting transition during melting, enabling robust capabilities. effectively prevents formation at −10 °C melts 4 mm‐thick layer within 310 s under sunlight. This work which combines photonics interface engineering, advances technologies for sustainable architecture energy‐efficient applications.

Language: Английский

Citations

0

Reversible solar heating and radiative cooling coupled with latent heat for self-adaptive thermoregulation DOI
Qin Ye, Na Guo, Meijie Chen

et al.

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(11)

Published: March 1, 2025

Passive solar heating and radiative cooling attracted lots of attention in global energy consumption reduction due to their unique electricity-free advantage. However, static single radiation or would lead over-cooling over-heating cold hot weather, respectively. How achieve effective self-adaptive thermoregulation is critical for dynamic thermal management. Hence, this work, a strategy was designed by coupling latent heat storage release with reversible cooling. A commercial memory alloy could realize at the temperature between high reflectance R¯solar = 0.95 emittance ε¯LWIR 0.93, absorptance α¯solar 0.92 low ε¯IR 0.08. High conductive phase change material further improve performance ∼136 J g−1, conductivity 3.4 W m−1 K−1, resulting superior than (39.9 vs 36.9 °C) (33.8 35.5 °C). The maximum increase be 12.7 °C situation, drop 8.3 situation. Energy calculation showed that sample save 68%–90% annual compared common roof, indicating spectral regulation can greatly total

Language: Английский

Citations

0

Fibrous Sphere Architectures for Efficient Daytime Radiative Cooling and Moisture Management DOI
Dhandayuthapani Thiyagarajan, Shichen Li, Bong‐Kee Lee

et al.

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: March 26, 2025

A radiative cooling nanofabric was designed to reflect incoming solar light, exhibit strong emissivity, and simultaneously provide moisture-wicking properties, making it suitable for personal thermal management in hot outdoor environments. We developed a with fibrous sphere architecture, consisting of polyacrylonitrile-SiO2 poly(vinylidene fluoride-co-hexafluoropropylene)-TiO2-Al2O3 as hydrophilic hydrophobic layers, complementing high reflectivity directional water transport well promising moisture capabilities. The architecture possessed excellent (93%) emissivity (∼0.95). In conditions under direct sunlight, the shown reduce skin temperature by 15 °C compared cotton textile. Furthermore, exhibited subambient capacity 5 at noon 2 nighttime. This provides pathway development nanofabrics integrated sweat/moisture management, enabling technologies heat control daily life.

Language: Английский

Citations

0

Hybrid passive cooling composites based on silane‐bridged titanium dioxide and low‐density polyethylene DOI
Yinjia Zhang,

Jun Natsuki,

Wenyong Liu

et al.

Polymer Composites, Journal Year: 2025, Volume and Issue: unknown

Published: April 12, 2025

Abstract Passive cooling materials represent an effective and environmentally friendly strategy for achieving energy efficiency. The passive performance can be achieved by shielding partial solar irradiance transmitting infrared radiation emitted the human body or surroundings. One solution is to utilize Mie scattering theory of nanoparticles (NPs) dispersed in polymers adjust spectral transmissivity. However, often limited agglomeration NPs polymer matrix. In this study, spherical titanium dioxide (TiO 2 ) with a diameter 350 nm were surface‐modified different concentrations durations silane coupling agent 3‐ (trimethoxy silyl) propyl methacrylate (KH‐570). Then, wt% TiO extruded low‐density polyethylene (LDPE) obtain well‐dispersed composites. optimal was using treated 20 KH‐570 8 h. fabricated composites exhibited average irradiation rate 58.0%, atmospheric window transmissivity 97.1%, 10.0°C under direct exposure. This study presented economical approach potential applications building envelopes, industrial facilities, personal thermal management systems. Highlights modified varying durations. Polymer hybridized LDPE fabricated. excellent performance. transmittance across windows.

Language: Английский

Citations

0

Integrated Thermoelectric Generation System for Sustainable All-Day Power Supply Based on Solar Energy and Radiative Cooling DOI

Yimeng Kang,

Peng Li,

Linlong Liang

et al.

ACS Applied Materials & Interfaces, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

Thermoelectric generators have a promising application in the field of sustainable energy due to their ability utilize low-grade waste heat and high reliability. The sun radiates large amount earth, yet most which is wasted. Efficient utilization solar can be achieved by integrating absorber, phase change material, Fresnel lens with thermoelectric generators. In this work, multiwalled carbon nanotubes are mixed polydimethylsiloxane as absorber achieve up 99% absorption sunlight. Meanwhile, radiative cooler also exhibits emissivity atmospheric window, cooling effect 7.3 K from ambient temperature realized at night. Paraffin wax material realizes storage during day release degree convergence sunlight over area, obtaining higher output performance lower cost. multienergy integrated synergistic generation system achieves an power density 4.1 mW/cm2 peak 0.2 night, meet demand for ab uninterrupted supply electronic devices. This work efficient provides option application.

Language: Английский

Citations

0