Air conditioning Economical – Material can replace the air conditioner!
A team of engineers at the University of Colorado Boulder has developed an engineering meta-material with extraordinary properties not found in nature to act as a type of engineering system. Air conditioning for structures.
he can cool objects even in direct sunlight with zero energy and water consumption.
When applied to a surface, the meta-material film cools the object underneath reflecting incoming solar energy back into space while simultaneously allowing the surface to shed its own heat onto the surface. form of infrared thermal radiation.
The new material, described in the journal Science, could provide a supplemental cooling medium for power plants, which currently require copious amounts of water and electricity to maintain their machines' operating temperatures.
Material promises to replace air conditioning! The material can cool roofs, structures with zero energy consumption!
The researchers' glass-polymer hybrid material measures just 50 micrometers thick—somewhat thicker than the aluminum foil found in a kitchen and can be manufactured economically in rolls, making it a potentially viable technology on a large scale for residential and commercial applications.
“We feel that this low-cost manufacturing process will be transformative for real-world applications of this radiative cooling technology,” said Xiaobo Yin, co-director of the research and assistant professor who has dual appointments in the Department of Mechanical Engineering at CU Boulder. Materials Science and Engineering Program. Yin received the DARPA Young Faculty award in 2015.
Thermal radiation provides some natural nighttime cooling and is used for residential cooling in some areas, but daytime cooling has historically been more of a challenge.
For a structure exposed to sunlight, even a small amount of directly absorbed solar energy is sufficient to negate passive radiation.
Despite being very different from a common system of a Air conditioning, the promises are effective and very similar to the utility of the original device.
The future challenges:
The challenge for the CU Boulder researchers, then, was to create a material that could provide two solutions in one: reflect any sun's rays back into the atmosphere while providing a means of escape for infrared radiation.
To solve this, the researchers embedded glass microspheres with visible infrared radiation scattering into a polymer film.
Then they added a thin silver coating underneath to get maximum spectral reflectance.
“Both the glass polymer metamaterial formation and the silver coating are fabricated at scale in roll-to-roll processes,” added Ronggui Yang, also a professor of mechanical engineering and a member of the American Society of Mechanical Engineers.
“Only 10 to 20 square meters of this material in the roof might as well cool a home single-family in the summer,” said Gang Tan, an associate professor in the Department of civil Engineering and Architects from the University of Wyoming and co-author of the paper.
Economical air conditioning – Material can replace air conditioning!
In direct sunlight, the panels can overheat to temperatures that hamper their ability to convert sunlight into electricity.
“That makes a big difference in scale.”
The engineers have applied for a patent for the technology and are working with CU Boulder's Office of Technology Transfer to explore potential commercial applications. They plan to create a 200-square-foot prototype “cooling farm” in Boulder.
The invention is the result of a $ 3 million grant awarded in 2015 to Yang, Yin and Tang by the Department of Energy-Energy Advanced Research Projects Agency (ARPA-E).
“The main advantage of this technology is that it works 24/7 without using electricity or water,” Yang said. "We are excited about the opportunity to explore potential uses in the energy industry, aerospace, agriculture and more."
Co-authors of the new research include Yao Zhai, Yaoguang Ma and Dongliang Zhao of CU Boulder Department of Mechanical Engineering; Sabrina David, from CU's Materials Science and Engineering Program; And Runnan Lou of the Ann and HJ Smead Department of Aerospace Engineering Sciences.
Source: University of Colorado Bouder
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