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

3

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

2

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

9

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

1

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

1

Thermal conductive radiative cooling film for local heat dissipation DOI
Ye Qin, Xingyu Chen,

Hongjie Yan

et al.

Materials Today Physics, Journal Year: 2024, Volume and Issue: 50, P. 101626 - 101626

Published: Dec. 13, 2024

Language: Английский

Citations

5

A flexible and superhydrophobic PVDF-HFP@PVA bilayer enables high-performance radiative cooling and thermal management DOI
Jun‐Heng Fu,

Q.C. Zhang,

Minglei Yan

et al.

Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 157877 - 157877

Published: Nov. 1, 2024

Language: Английский

Citations

4

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

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

Ultrabreathable Open-Cell Hierarchical Pore Structure for Radiative Cooling Protective Membranes DOI
Bin Liu, Renyan Zhang, Tao Yu

et al.

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

Published: April 18, 2025

Personal protective clothing is essential in biochemical threat environments, however balancing protection, thermal comfort, and breathability remains a significant challenge. This work introduces novel, skin-friendly ultrabreathable radiative cooling membrane (Ub-RCPM), which developed via one-step evaporation-induced pore formation process. The sequential evaporation of solvent nonsolvent during the process endows an open-cell hierarchical structure. By adjusting size, Ub-RCPM simultaneously offers high moisture permeability, passive cooling. structure demonstrates sunlight reflectivity 94.79% infrared emissivity 94.53% through atmospheric window, enables efficient Its water vapor transmission rate 8904.59 g m-2 day-1, 3.5 times higher than that commercial protection clothing. Additionally, submicron pores provide filtration efficiency 99.1% for 75 nm aerosols. combination ultrahigh to temperature lower by 9.6-16.5 °C real-world conditions. presents groundbreaking approach design future comfortable personal

Language: Английский

Citations

0