POSTECH-Korea University joint research team develops a non-energy consuming radiative cooling material.
Now that autumn is upon us, there is a large temperature gap between day and night. This is due to the temperature inversion caused by radiative cooling on the Earth’s surface. Heat from the sun during the day causes its temperature to rise and when the sun sets during the night, its temperature cools down. Recently, a joint research team from POSTECH and Korea University has demonstrated a daytime radiative cooling effect which exhibits lower temperatures than its surroundings even during the day.
Professor Junsuk Rho and Ph.D. candidate Dasol Lee of departments of mechanical engineering and chemical engineering and Professor Jin Kon Kim and Ph.D. candidate Myeongcheol Go in the Department of Chemical Engineering at POSTECH have conducted a joint study with Professor Heon Lee of Materials Science Engineering at Korea University to successfully realized an energy-free radiative cooling technology using silica-coated porous anodic aluminum oxide. The study was published in the latest online edition of Nano Energy, an international journal in the energy sector.
With growing interest in energy consumption, such as environmental pollution and limitations in using fossil fuels, attempts to lower the temperature without consuming energy continue. Radiative cooling is an example of structures installed on windows or walls to reduce the building temperature by reflecting sunlight or by absorbing and radiating far-infrared light. Radiative cooling is a technology that allows objects to receive less energy from the sun and lower temperatures by emitting radiative heat.
Unlike conventional cooling systems, radiative cooling is difficult to apply to large areas, although it has the advantage of significantly reducing energy consumption like electricity. Research to overcome this issue is being actively carried out around the world but it is still challenging to commercialize the technology.
To this, the joint research team found a very simple solution. Just by coating the porous anodic aluminum with a thin film of silica*1, it has been confirmed that there is a cooling effect that exhibits a lower temperature than the surroundings even under direct sunlight.
Experiments have confirmed that an optimized structure can have a reflectivity*2 of 86% in the solar spectral region and a high emissivity*3 of 96% in the atmospheric window (8-13 ?m). In addition, the radiative cooling material – produced in centimeters – showed a cooling efficiency of up to 6.1°C during the day when the sunlight was strong.
“This newly developed radiative cooling material can be easily produced,” explained POSTECH Professor Junsuk Rho. He added optimistically, “It will help solve environmental problems if applied to heating and cooling systems since it can be readily applied to large areas.”
The Latest Updates from Bing News & Google News
Go deeper with Bing News on:
- Radiation-generated short DNA fragments may perturb non-homologous end-joining and induce genomic instability
Cells exposed to densely ionizing radiation (high-LET) experience more severe biological damage than do cells exposed to sparsely ionizing radiation (low-LET). The prevailing hypothesis is that ...
- Nobel winners made possible predictions of global warming and modern weather forecasting | Opinion
As a climate scientist myself, I was excited to learn that, Klaus Hasselmann and Giorgio Parisi have been awarded the 2021 Nobel Prize for Physics ...
- Another Warm Day's in Store Thursday, But the Cooling Trend Will Start for Some
A high pressure system has controlled much of the weather Wednesday, but as a trough enters Vermont and New Hampshire, showers have now started to roll into the north, producing light to moderate ...
- Surprise: the Big Bang isn’t the beginning of the universe anymore
We used to think the Big Bang meant the universe began from a singularity. Nearly 100 years later, we're not so sure.
- Deadly Heat Is Baking Cities. Here’s How to Cool Them Down
Urban areas can be 20 degrees hotter than the surrounding country. But green spaces and reflective pavement can make city life more bearable.
Go deeper with Google Headlines on:
Go deeper with Bing News on:
Radiative cooling material
- Outdoor Action Guide to
The material contained in this workshop may not be the most current. How We Lose Heat to the Environment Radiation - loss of heat to the ... The environment acts as either a heating or a cooling force ...
- How Do Volcanoes Contribute to Climate Change?
Volcanoes change Earth’s climate both by warming and cooling it. Their net effect on ... (As an example of how much material a volcano can spew, The National Oceanic and Atmospheric ...
- How do humans make sense of the bomb?
After 30 years of cooling ... levels of radiation exposures to the nuclear bomber crew proved insurmountable. To minimize engine size and avoid high pressures, the aircraft's nuclear reactor had used ...
- Those Voices In Your Head Might Be Lasers
When certain materials absorb light — or any electromagnetic radiation — that is either ... is the energy causes localized heating and cooling, the material microscopically expands and ...
- New polycarbonate material blocks near infrared radiation
Latest polycarbonate grade from Sumitomo Chemical affiliate Sumika Polycarbonate shuts out IR irradiation, and in doing so has a cooling effect in vehicle ... Target applications for the new materials ...