TAGS: Architectural Coatings Sustainability / Natural Coatings Smart Coatings
University of Maryland (UMD) researchers aiming to combat rising global temperatures have developed a new ‘cooling glass’ that can turn down the heat indoors without electricity by drawing on the cold depths of space.
The new technology, a microporous glass coating, can lower the temperature of the material beneath it by 3.5 degrees Celsius at noon and has the potential to reduce a mid-rise apartment building’s yearly carbon emissions by 10%, according to the research team led by university professor Liangbing Hu in the Department of Materials Science and Engineering.
Reflects 99% Solar Radiation
The coating works in two ways. First, it reflects up to 99% of solar radiation to stop buildings from absorbing heat. More intriguingly, it emits heat in the form of longwave infrared radiation into the icy universe, where the temperature is generally around -270 degrees Celsius, or just a few degrees above absolute zero.
In a phenomenon known as ‘radiative cooling’, space effectively acts as a heat sink for the buildings. They take advantage of the new cooling glass design along with the so-called atmospheric transparency window, a part of the electromagnetic spectrum that passes through the atmosphere without boosting its temperature to dump large amounts of heat into the infinite cold sky beyond.
The same phenomenon allows the earth to cool itself, particularly on clear nights, although with much less intense emissions than those from the new glass developed at UMD.
“
It’s a game-changing technology that simplifies how we keep buildings cool and energy-efficient,” said assistant research scientist Xinpeng Zhao, the first author of the study. “
This could change the way we live and help us take better care of our home and our planet."
Unlike previous attempts at cooling coatings, the new UMD-developed glass is environmentally stable, able to withstand exposure to water, ultraviolet radiation, dirt and even flames, enduring temperatures of up to 1,000 degrees Celsius. The glass can be applied to a variety of surfaces like tile, brick and metal, making the technology highly scalable and adaptable for wide use.
Cooling Glass to Cut Energy Consumption
The team used finely ground glass particles as a binder, allowing it to avoid polymers and enhance its long-term durability outdoors. And they chose the particle size to maximize emission of infrared heat while simultaneously reflecting sunlight. The development of cooling glass aligns with global efforts to cut energy consumption and fight climate change.
“
This 'cooling glass' is more than a new material. It's a key part of the solution to climate change,” said Hu. “
By cutting down on air conditioning use, we're taking big steps toward using less energy and reducing our carbon footprint. It shows how new technology can help us build a cooler, greener world."
The team is now focusing on further testing and practical applications of their cooling glass. They are optimistic about its commercialization prospects and have created the startup company CeraCool to scale up and commercialize it.
Source: University of Maryland