Ferdinand Posted April 16, 2021 Share Posted April 16, 2021 This looks slightly interesting. It is claimed to also reflect IR. Quote https://www.bbc.co.uk/news/science-environment-56749105 "Scientists in the US have developed a paint significantly "whiter than the whitest paint currently available". Tests carried out by researchers at Purdue University on their "ultra-white" paint showed it reflected more than 98% of sunlight. That suggests, the scientists say, that it could help save energy and fight climate change. Painting "cool roofs" white is an energy-saving approach already being rolled out in some major cities. Commercially available white paints reflect between 80% and 90% of sunlight, according to lead researcher Prof Xiulin Ruan from Purdue, in West Lafayette, Indiana. "It's a big deal, because every 1% of reflectance you get translates to 10 watts per metre squared less heat from the Sun," he explained." Link to comment Share on other sites More sharing options...
daiking Posted April 16, 2021 Share Posted April 16, 2021 Pea-roast Link to comment Share on other sites More sharing options...
joe90 Posted April 16, 2021 Share Posted April 16, 2021 That’s because so much energy is used to run air con units in hot parts of the country (I guess) what we need is a white paint for hot weather that turns black when it gets cold ?. Link to comment Share on other sites More sharing options...
SteamyTea Posted April 16, 2021 Share Posted April 16, 2021 3 minutes ago, joe90 said: white paint for hot weather that turns black when it gets cold Or a black paint that reflects. SUBSCRIBE AND SAVE 61% Menu Infrared-reflecting paint can cool buildings even when it is black TECHNOLOGY 24 April 2020 By Layal Liverpool New Scientist Default Image A new paint reflects infrared with a layer of polymer, which helps keep objects cool Jyotirmoy Mandal A two-layered paint that reflects infrared light while maintaining its colour could help keep buildings and vehicles cool under hot sun. This could help reduce energy used in cooling, such as by air conditioners. This coating was developed by Yuan Yang at Columbia University in New York and his colleagues. It consists of a top layer of commercial paint, which provides the colour, and a bottom layer made of a polymer similar to Teflon, which reflects infrared light. Advertisement Sunlight contains both visible and infrared light but the infrared accounts for the majority of the solar energy, says Yang. When the sun shines on an object coated with this paint, the top layer absorbs certain wavelengths of light, depending on the paint’s colour, while the bottom layer reflects infrared light, preventing the object from heating up. A similar cooling effect can be achieved using white paint or metal mirrors, but Yang says the advantage of this new paint is that it can be any colour desired. Read more: Earthquake-resistant paint could help brick buildings survive tremors Usually black paint absorbs heat, but painting an object with a black version of this new coating kept it about 16°C cooler than when an object painted with commercial black paint was exposed to the same amount of sunlight. In another test, the new paint coating was found to be able to maintain its colour despite being placed in an oven at 60°C for 30 days. Yang says this paint could help save electricity and reduce carbon dioxide emissions. “Solar reflective and thermally emissive surfaces offer a sustainable way to cool objects under sunlight,” says Mingqing Wang at University College London, who was not involved with the work. This could be useful in tropical locations to help keep buildings cool and reduce electricity consumption from air conditioning, as well as to prevent cars, buses and trains from getting too hot, she says. An intriguing next step would be to try and add more functionality to the coating, for instance to enable the energy from the reflected infrared light to be harvested to generate electricity, says Wang. Journal reference: Science Advances, DOI: 10.1126/sciadv.aaz5413 More on these topics: materials science Advertisement TRENDING LATEST VIDEO FREE How to keep your brain healthy: The 7 things you should do every day Quantum computers are revealing an unexpected new theory of reality The frequencies of a vibrating spider web have been made into music What causes the rare blood clots linked with some covid-19 vaccines? Covid-19 news: Doubts about Olympics as cases surge in Japan New Scientist Default Image SUBSCRIBE VIEW IN THE APP BUY IN PRINT Advertisement MORE FROM NEW SCIENTIST Whitest paint ever reflects 98 per cent of light and could cool homes Whitest paint ever reflects 98 per cent of light and could cool homes ENVIRONMENT camel Gel layer inspired by camel fur could keep food and medicines cool TECHNOLOGY White building Superwhite paint can cool buildings even in hot sunlight ENVIRONMENT water in desert Water could be extracted from desert air using heat from sunlight TECHNOLOGY PROMOTED STORIES [Pics] You Need To See What Nostradamus Predicted For This Year [Pics] You Need To See What Nostradamus Predicted For This Year Maternity Week Two Drops Of This Before Bed Relieves Years of Joint Pain and Arthritis (Try This Tonight) Two Drops Of This Before Bed Relieves Years of Joint Pain and Arthritis (Try This Tonight) CBD oil The biggest losers from covid-19 The biggest losers from covid-19 The Economist Discover The Benefit Everyone Can Claim Discover The Benefit Everyone Can Claim Reassured Knee Surgeons Amazed By These Revolutionary Knee Sleeves Knee Surgeons Amazed By These Revolutionary Knee Sleeves The Wire Magazine Your Horoscope: so accurate that it will give you goosebumps Your Horoscope: so accurate that it will give you goosebumps The extraordinary Chris Recommended by Sign up to our newsletters Enter your email address to get started Your email Contact usCoronavirus: customer updateHelpAbout usPrivacy & cookiesCookie preferencesTerms & conditions AdvertiseWrite for usEventsScience jobsSyndicationRSS feeds Gift subscriptionsStudent subscriptionsEducational subscriptionsCorporate subscriptions GET THE APP Get it on Google Play FOLLOW US © Copyright New Scientist Ltd. Back to top Read more: https://www.newscientist.com/article/2241717-infrared-reflecting-paint-can-cool-buildings-even-when-it-is-black/#ixzz6sD4F2w3p 1 Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now