A team of University of Colorado Boulder engineers has developed a scalable manufactured metamaterial — an engineered material with extraordinary properties not found in nature — to act as a kind of air conditioning system for structures. It has the ability to cool objects even under direct sunlight with zero energy and water consumption.
When applied to a surface, the metamaterial film cools the object underneath by efficiently reflecting incoming solar energy back into space while simultaneously allowing the surface to shed its own heat in the form of infrared thermal radiation.
The new material, which is described today in the journal Science, could provide an eco-friendly means of supplementary cooling for thermoelectric power plants, which currently require large amounts of water and electricity to maintain the operating temperatures of their machinery.
The researchers’ glass-polymer hybrid material measures just 50 micrometers thick — slightly thicker than the aluminum foil found in a kitchen — and can be manufactured economically on rolls, making it a potentially viable large-scale technology for both 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 an assistant professor who holds dual appointments in CU Boulder’s Department of Mechanical Engineering and the Materials Science and Engineering Program. Yin received DARPA’s Young Faculty Award in 2015.
The material takes advantage of passive radiative cooling, the process by which objects naturally shed heat in the form of infrared radiation, without consuming energy. 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 enough to negate passive radiation.
The challenge for the CU Boulder researchers, then, was to create a material that could provide a one-two punch: reflect any incoming solar rays back into the atmosphere while still providing a means of escape for infrared radiation. To solve this, the researchers embedded visibly-scattering but infrared-radiant glass microspheres into a polymer film. They then added a thin silver coating underneath in order to achieve maximum spectral reflectance.
“Both the glass-polymer metamaterial formation and the silver coating are manufactured at scale on roll-to-roll processes,” added Ronggui Yang, also a professor of mechanical engineering and a Fellow of the American Society of Mechanical Engineers.
“Just 10 to 20 square meters of this material on the rooftop could nicely cool down a single-family house in summer,” said Gang Tan, an associate professor in the University of Wyoming’s Department of Civil and Architectural Engineering and a co-author of the paper.
In addition to being useful for cooling of buildings and power plants, the material could also help improve the efficiency and lifetime of solar panels. In direct sunlight, panels can overheat to temperatures that hamper their ability to convert solar rays into electricity.
“Just by applying this material to the surface of a solar panel, we can cool the panel and recover an additional one to two percent of solar efficiency,” said Yin. “That makes a big difference at scale.”
The engineers have applied for a patent for the technology and are working with CU Boulder’s Technology Transfer Office to explore potential commercial applications. They plan to create a 200-square-meter “cooling farm” prototype in Boulder in 2017.
“The key advantage of this technology is that it works 24/7 with no electricity or water usage,” said Yang “We’re excited about the opportunity to explore potential uses in the power industry, aerospace, agriculture and more.”
Receive an email update when we add a new RADIATIVE COOLING TECHNOLOGY article.
The Latest on: Radiative cooling technology
via Google News
The Latest on: Radiative cooling technology
- Radiant Barrier and Reflective Insulation Market will be Growing at a Sturdy 9% CAGR By The end of 2026 on October 3, 2018 at 4:50 pm
Primarily driven by soaring utilization and requirement for energy proficient passive cooling systems along with markedly increasing benefits of green building schemes by various nations all over the ... […]
- How it Works: Water for Power Plant Cooling on October 3, 2018 at 9:59 am
Siting: The geographic location of power plants has a huge impact on cooling technology options ... must be sited in areas with high solar radiation and geothermal energy, respectively—locations that ... […]
- Data Center Market in China to grow at a CAGR of 11.55% during the period 2018-2022: Radiant Insights on October 2, 2018 at 6:29 am
It includes high-performance servers, networking equipment, storage arrays, and supporting services such as powering and cooling ... as Technology, Chemicals, Materials, and Energy. Radiant ... […]
- Yantra-Vigyaan Advaita: The Non-Dualism Of Science And Technology on October 1, 2018 at 7:14 am
“It is impossible to construct an engine which will work in a complete cycle, and produce no effect except the raising of a weight and cooling of ... holes can emit radiation, the nature of ... […]
- Cooling paint drops the temperature of any surface on September 27, 2018 at 11:47 am
Researchers are building on that age-old strategy with a new wave of "passive radiative cooling" materials that shed sunlight ... applied physicists Angus Gentle and Geoff Smith of the University of T... […]
- Watch: Air-cooling Polymer Coating Applies Like Paint on September 27, 2018 at 11:04 am
It is essential that we find solutions to this climate challenge, and we are very excited to be working on this new technology that addresses ... The design is based on the passive daytime radiative c... […]
- Global Radiant Heating and Cooling Systems Market 2018-2022 | Rising Demand for Smart Homes to Drive Growth | Technavio on September 17, 2018 at 5:00 pm
Segmentation analysis This market research report segments the global radiant heating and cooling systems market by technology (hydronic and electric), end-user (residential and non-residential), and ... […]
- Radiant Heating and Cooling Systems Market Evolving Technology, Trends and Industry Analysis 2017–2027 on September 6, 2018 at 4:27 pm
Valley Cottage, NY -- (SBWIRE) -- 09/06/2018 -- Globally, the growing demand, consumption, and high cost of energy are creating severe issues for human beings. To reduce energy consumption and price, ... […]
- Radiant Heating and Cooling Systems Market Evolving Technology, Trends and Industry Analysis 2017–2027 on September 5, 2018 at 5:00 pm
Future Market Insights has announced the addition of the “Radiant Heating And Cooling Systems Market: Global Industry Analysis 2012 – 2016 and Opportunity Assessment; 2017 – 2027" report to their offe... […]
via Bing News