All-day passive radiative cooling using common salts

Reale Batista, Mariana Desireé; Troksa, Alyssa L.; Eshelman, Hannah V.; Bagge-Hansen, Michael; Roehling, John D.

doi:10.1039/d3mh01139a

Cited by 3 publications

(1 citation statement)

References 42 publications

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“…Furthermore, in view of solar thermal generation devices and thermos flasks, the mass‐production of radiative cooling device in a vacuum enclosure is not considered a major hurdle. As for the price and the toxicity of the germanium window, alternative materials such as anti‐reflection‐coated silicon or common salts [ 82 ] can be considered. Future endeavors are directed to the design of a more compact vacuum enclosure which addresses some of these issues, equipped with a heat exchanger to provide cooling outside the vacuum chamber.…”

Section: Conclusion and Discussionmentioning

confidence: 99%

Daytime Radiative Cooling under Extreme Weather Conditions

Hwang

2024

Adv Energy and Sustain Res

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Radiative cooling, taking advantage of the coldness of the sky, has a potential to be a sustainable alternative to meet cooling needs. The performance of a radiative cooling device is fundamentally limited by the emissivity of the sky, therefore depends heavily on the regional weather conditions. Although the sky emissivity is known to increase with the dew point temperature, the feasibility of radiative cooling remains elusive in the equatorial tropical climate, where the weather is humid, cloudy, and constantly changing. It is pointed out that a high degree of thermal insulation of the radiative cooling system can be effective under such extreme weather conditions. A new method to characterize dynamic sky conditions is presented, namely to measure the sky window emissivity in the zenith direction. It is shown that a sub‐ambient cooling up to 8 °C is possible during daytime and that the cloud base is not a complete blackbody and can be used as a heat sink for radiative cooling.

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Section: Conclusion and Discussionmentioning

confidence: 99%

Daytime Radiative Cooling under Extreme Weather Conditions

Hwang

2024

Adv Energy and Sustain Res

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Materials in Radiative Cooling Technologies

Liu,

Wang,

Zhou

et al. 2024

Advanced Materials

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Radiative cooling (RC) is a carbon‐neutral cooling technology that utilizes thermal radiation to dissipate heat from the Earth's surface to the cold outer space. Research in the field of RC has garnered increasing interest from both academia and industry due to its potential to drive sustainable economic and environmental benefits to human society by reducing energy consumption and greenhouse gas emissions from conventional cooling systems. Materials innovation is the key to fully exploit the potential of RC. This review aims to elucidate the materials development with a focus on the design strategy including their intrinsic properties, structural formations, and performance improvement. The main types of RC materials, i.e., static‐homogeneous, static‐composite, dynamic, and multifunctional materials, are systematically overviewed. Future trends, possible challenges, and potential solutions are presented with perspectives in the concluding part, aiming to provide a roadmap for the future development of advanced RC materials.This article is protected by copyright. All rights reserved

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Wearable Aerogels for Personal Thermal Management and Smart Devices

Wu,

Qi,

Liu

et al. 2024

ACS Nano

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Extreme climates have become frequent nowadays, causing increased heat stress in human daily life. Personal thermal management (PTM), a technology that controls the human body's microenvironment, has become a promising strategy to address heat stress. While effective in ordinary environments, traditional high-performance fibers, such as ultrafine, porous, highly thermally conductive, and phase change materials, fall short when dealing with harsh conditions or large temperature fluctuations. Aerogels, a third-generation superinsulation material, have garnered extensive attention among researchers for their thermal management applications in building energy conservation, transportation, and aerospace, attributed to their extremely low densities and thermal conductivity. While aerogels have historically faced challenges related to weak mechanical strength and limited secondary processing capacity, recent advancements have witnessed notable progress in the development of wearable aerogels for PTM. This progress underscores their potential applications within extremely harsh environments, serving as self-powered smart devices and sensors. This Review offers a timely overview of wearable aerogels and their PTM applications with a particular focus on their wearability and suitability. Finally, the discussion classifies five types of PTM applications based on aerogel function: thermal insulation, heating, cooling, adaptive regulation (involving thermal insulation, heating, and cooling), and utilization of aerogels as wearable smart devices.

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All-day passive radiative cooling using common salts

Abstract: An infrared transparent foam made from inexpensive salts was developed enabling sub-ambient cooling of underlying surfaces for a full 24 hour cycle. This work showcases how non-convetional materials may be used for passive day-time radiative cooling.

Cited by 3 publications

References 42 publications

Daytime Radiative Cooling under Extreme Weather Conditions

Daytime Radiative Cooling under Extreme Weather Conditions

Materials in Radiative Cooling Technologies

Wearable Aerogels for Personal Thermal Management and Smart Devices

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