The system absorbs the heat in the air in the box and transmits the energy through the earth's atmosphere, thereby helping to cool the surrounding environment. Image source: State University of New York at Buffalo
Recently, Chinese and foreign engineers have designed an "air conditioner" that can dissipate heat directionally to cool down crowded metropolitan buildings without using electricity. Related papers were published in "Nature-Sustainability" on August 5.
The system includes a special component-inexpensive polymer / aluminum film. This film can absorb the heat in the air inside the box and transfer the energy to the air outside the box to keep the environment around the box cool. Moreover, the researchers said that the box also has a double insurance: the box wall radiates the heat from the film into the outside air while blocking the incident sunlight.
"The polymer can be kept cool by radiant heat, which is also called passive cooling, and it does not consume electrical energy-it does not require batteries or other power sources to achieve cooling." The paper co-first author, State University of New York, USA Lyu Zhou of the School of Electrical Engineering at Buffalo said.
Researchers from institutions such as State University of New York at Buffalo, the University of Wisconsin-Madison, King Abdullah University of Science and Technology in Saudi Arabia, and Hangzhou University of Electronic Technology in China jointly developed a new device that can The temperature of the small enclosed space can be reduced by a maximum of 6 degrees Celsius and at night by a maximum of 11 degrees Celsius, and multiple devices can be installed on the roof to cool the building.
The device is approximately 18 feet high (45.72 cm), 10 feet wide (25.4 cm), and 10 feet long, and contains many interesting optical design features.
The core component is a polymer / metal film, which is composed of an aluminum film coated with a polymer material "polydimethylsiloxane". Aluminum can reflect sunlight, and the polymer material can absorb and dissipate the heat in the air. The engineer placed this material on the bottom of a foam box and built a sun visor on the top of the box. Using a material that absorbs solar energy, he built 4 outwardly inclined box walls and an inverted square in the box. cone.
The researchers said that one of the innovations of the system is the purpose of directing heat directly to the sky. Usually heat radiation is directed in all directions, but this device can radiate heat to the sky like a car headlight. "We found a way to limit energy emissions in a narrow direction, which makes the system more effective in an urban environment with tall buildings in all directions. And we use low-cost, commercial materials, and the effect is very significant." The researchers Say. (Reporter Tang Feng)
Kn95 Mask,Kn95 3D Mask,Kn95 Face Mask,Kn95 Respirator
Ningbo Autrends Prevention Products Co., Ltd , https://www.autrendsafety.com