In the summer of 2022, the heat wave swept across many countries and regions around the world, and various cooling products emerged in the market.
Among them, the "radiative cooling metamaterial" launched by NBRL Advanced Materials Technology Corporation can reduce the temperature under the shed by 5°C to 15°C compared with ordinary awnings in the same sun-baked environment. And as a cooling car cover, it can reduce the temperature inside the car by up to 30°C!
Radiation cooling metamaterials have been widely used in green buildings, cold chain logistics, photovoltaics, modern agriculture, and shading protection in outdoor public spaces.
Coated with a layer of film, the maximum temperature can be lowered by 30°C
Walking into the exhibition hall of NBRL, you can see a variety of popular consumer goods such as car covers, tents, and umbrellas made of radiation refrigeration materials. At first glance, these products are indistinguishable from ordinary products on the market.
According to the introduction of the staff, its "cooling secret" is a new radiation-induced (refrigeration) cooling material attached to ordinary fabrics, and its thickness is only 30 microns.
Don't underestimate this ultra-thin new material. Under the hot sun, the temperature difference between the shade and the sun can reach 15°C to 30°C. The shade feels cool, and the larger the coating thickness and the higher the outside air temperature, the more obvious the effect.
Under the scorching sun, the temperature inside a car that has been exposed to the sun for a long time can reach above 60°C. If covered with a radiant cooling car cover, the temperature inside the car can be reduced by 25°C to 30°C, which can be reduced by 10°C to 15°C compared with ordinary sunscreen car covers.
The reporter did a testing experiment. At that time, the outdoor temperature was 39.7 ℃, the reporter covered one car with a new material to cool down the car cover, and the other car was directly exposed to the sun. After 5 minutes, the thermometer showed that the temperature inside the two cars was 41°C and 58°C, respectively, and the new material had an obvious effect of heat insulation and cooling.
Radiation cooling metamaterial technology, not only can fully reflect sunlight. Moreover, 24-hour continuous cooling can be achieved by emitting infrared rays of 8-13 microns with high intensity. This is the technical principle of "zero energy radiation cooling metamaterial".
NBRL is the forerunner in the development and application of the global "zero energy radiation cooling metamaterial" technology, and the drafting unit of China's radiation-induced (refrigeration) cold film group standard (T/ZZB2304-2021).
On December 27, 2019, the world's first batch of industrialized radiation cooling film products rolled off the production line at NBRL.
Today, NBRL has developed a variety of products such as radiation cooling films, radiation cooling metal tiles, and radiation cooling coatings, and has applied for more than 200 domestic and foreign patents for related technologies.
Many international airports, urban exhibition halls, and international convention and exhibition centers in China and internationally have installed reflective radiation cooling films, transmissive radiation cooling films, and radiation cooling coatings.