APR 18, 2021 7:29 AM PDT

Making white paint even whiter could cut summertime energy costs

Researchers from Purdue University have developed an ultra-white paint that can reflect solar heat and therefore decrease the need for cooling technologies like air conditioning. The white paint, while not the first developed with this cooling effect in mind, is by far the whitest yet designed and has significantly greater cooling capacities than any other paint to date.

"If you were to use this paint to cover a roof area of about 1,000 square feet, we estimate that you could get a cooling power of 10 kilowatts. That's more powerful than the central air conditioners used by most houses," said Xiulin Ruan, who is a Purdue professor of mechanical engineering.

Current commercial heat-reflecting paints only are able to reflect between 80-90% of solar heat and are unable to cool surfaces more than their surroundings. This paint, which is described in the journal ACS Applied Materials & Interfaces, reflects up to 98.1% of sunlight and disperses infrared heat away from the surface on which it is applied. The researchers compare it to Vantablack, which is known as the blackest black and absorbs 99.9% of visible light.

The paint’s ultra-whiteness comes from the high concentration and varied particle size of a chemical compound barium sulfate. "A high concentration of particles that are also different sizes gives the paint the broadest spectral scattering, which contributes to the highest reflectance," explained Joseph Peoples, who is a Purdue Ph.D. student in mechanical engineering. Its super reflectivity also means that it is able to keep surfaces 19 degrees Fahrenheit cooler than their ambient surroundings at night and 8 degrees Fahrenheit cooler under strong sunlight during the peak midday heat.

Finding the right balance of particle concentration is crucial for making sure that the paint remains usable. "Although a higher particle concentration is better for making something white, you can't increase the concentration too much. The higher the concentration, the easier it is for the paint to break or peel off," said Xiangyu Li, a postdoctoral researcher at the Massachusetts Institute of Technology.

Radiative cooling paint offers an alternative to keeping air conditioner use low and reducing energy costs. The researchers are confident that their barium sulfate-based paint is ready for the commercial paint fabrication process, assuring that it remains effective in outdoor conditions.

Sources: ACS Applied Materials & Interfaces, Science Daily

About the Author
  • Kathryn is a curious world-traveller interested in the intersection between nature, culture, history, and people. She has worked for environmental education non-profits and is a Spanish/English interpreter.
You May Also Like
AUG 10, 2021
Neuroscience
Is consciousness a quantum phenomenon?
AUG 10, 2021
Is consciousness a quantum phenomenon?
Researchers experiments with quantum fractals reveal promising direction for consciousness research
SEP 22, 2021
Chemistry & Physics
Commercial Fusion Energy Could be Within Reach, Thanks to the World's Most Powerful Magnet
SEP 22, 2021
Commercial Fusion Energy Could be Within Reach, Thanks to the World's Most Powerful Magnet
Commonwealth Fusion Systems (CFS) announced this month that their new magnet might be the breakthrough needed to make fu ...
OCT 06, 2021
Chemistry & Physics
2021's Nobel Prize in Physics Recognizes Foundational Work in Climate Science
OCT 06, 2021
2021's Nobel Prize in Physics Recognizes Foundational Work in Climate Science
The 2021 lineup for one of the world’s most prestigious awards has been announced, and the medal for physics has b ...
OCT 14, 2021
Plants & Animals
The Physics of Insect Swarms
OCT 14, 2021
The Physics of Insect Swarms
Do you know those pesky bugs that happen swarm in front of your door right as you open it? Those swarms and the insects ...
OCT 14, 2021
Cell & Molecular Biology
Cutting Edge Tools Change Our View of the Nuclear Pore Complex
OCT 14, 2021
Cutting Edge Tools Change Our View of the Nuclear Pore Complex
There are many intricate molecular machines that perform essential functions, and this work has called a method used to ...
NOV 09, 2021
Clinical & Molecular DX
Device Scavenges Body Heat, Allows Crowds to Gather Safely
NOV 09, 2021
Device Scavenges Body Heat, Allows Crowds to Gather Safely
If efforts to maintain public safety amidst the ongoing pandemic have taught us one thing, it’s that we need bette ...
Loading Comments...