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Researchers from the United States and Saudi Arabia have collaborated to develop an "air conditioner" that can dissipate heat directionally, cooling urban buildings without consuming electricity.
A study published in the British journal Nature and Sustainability on the 5th showed that this device consists of an aluminum film coated with a polymer material "polydimethylsiloxane". Aluminum can reflect sunlight, while polymer materials Can absorb and dissipate the heat in the air.
The research was conducted in collaboration with researchers from the State University of New York at Buffalo, the University of Wisconsin-Madison, and King Abdullah University of Science and Technology in Saudi Arabia. They placed the film on the bottom of a box and erected four "walls" made of solar energy absorbing material on the box, with an inverted pyramid in the middle. The film can absorb the heat in the box; while the "wall" blocks the incident sunlight, it radiates the heat from the film into the outside air.
Researchers say that usually heat radiation is directed in all directions, but this device can radiate heat toward the sky like a car headlight, so as to dissipate heat more effectively in the environment of tall buildings in cities.
Research shows that this device can reduce the temperature of a small enclosed space by up to 6 degrees Celsius during the day and 11 degrees Celsius at night. The device is about 46 cm high and about 25 cm long and wide. It can be installed on the roof to cool the building. (Reporter Zhou Zhou)
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