Posts Tagged ‘cooling’
“Never underestimate the power of a fresh coat of white paint”*…
A new twist on an old-school climate adaptation technique– Lara Williams reports…
In a co-working space overlooking the west London neighborhood of White City, a host of startups are at work on flashy technologies ranging from a breath test that can detect multiple cancers to a pain-free tattoo. Surrounded by that kind of innovation, a visitor might overlook the lab stocked with little more than tubs of white powder and paint pots. After all, how interesting can white paint be?
When it comes to adapting to a hotter planet, the answer is: very.
As record temperatures baked Europe this summer, people desperately sought ways to cool their homes and workplaces. I stuck emergency foil blankets to my windows in an attempt to stop the heat from getting in; others tried coating the glass in yogurt or chalk. But of course, the most popular and effective option was air conditioning.
Sales of both conventional and portable units shot up this year, and the need for that cool breeze is only going in one direction: By 2035, the International Energy Agency predicts that global cooling demand could grow by about 2,300 terawatt-hours. (For context, that’s more than India’s total electricity demand in 2025.)
This is bad news for the energy transition. Consider that in 2023, the UK fired up a coal plant during a heatwave to meet AC demand. Yes, air conditioning can be a literal lifesaver, but if we want to avoid making the planet even hotter, it can’t be our only strategy.
That’s where paint comes in.
People in countries like Greece and Spain have been painting their homes white to keep them cool for centuries. White reflects most sunlight, making it better than other colors at preventing solar energy from being absorbed as heat. Commercial “solar-reflecting” paints reflect up to 90% of sunlight, but recent innovations in materials science promise to make white paint’s cooling properties even stronger.
The secret is something called daytime radiative cooling. Any object with a temperature above absolute zero emits heat as thermal infrared radiation. Some infrared wavelengths transfer more heat because they are able to pass through the atmosphere into the freezing depths of space. That process is how our planet cools itself.
Typically, net cooling only happens at night, when there’s no incoming sunlight — and therefore solar radiation — adding more heat. But in 2014, researchers at Stanford University demonstrated that it was possible to chill a surface to 5C below the ambient air temperature during the day by combining the power of reflective cooling (i.e. when white paint reflects sunlight) and radiative cooling (what happens when infrared radiation passes through the atmosphere).
More than a decade later, this technology is making its way into the marketplace…
[Williams describes the entrepreneurial efforts underway, examines their challenges, and explores their potential. She concludes…]
… Innovations that improve our lives don’t always look like talking computers or flying cars. As someone who suffered through too many sweaty, sleepless nights this summer, that humble bucket of white paint is starting to look pretty exciting.
“Why I’m Excited About a Bucket of White Paint” (gift link, or archived link), from @lararhiannon.bsky.social in @opinion.bloomberg.com.
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As we stay cool, we might spare a thought for Sir John Leslie; he died on this date in 1832. A Scottish mathematician and physicist, he best remembered for his research into heat. Leslie gave the first modern account of capillary action in 1802 and froze water using an air-pump in 1810, the first artificial production of ice. Then, in 1804, he helped lay the scientific groundwork for the advances considered in the article linked above: he experimented with radiant heat using a cubical vessel filled with boiling water. One side of the cube was composed of highly polished metal, two of dull metal (copper), and one side painted black. He showed that radiation was greatest from the black side and negligible from the polished side. The apparatus is known as a Leslie cube.
“The ice was here, the ice was there, The ice was all around”*…
Your correspondent will on the road for the next several days, so (R)D will be on hiatus until on or around September 3. Meantime, a seasonally-appropriate post…
Writing for Texas Monthly, Lauren Larson visits Reddy Ice, the largest producer of packaged ice in North America and it’s CEO, Lonny Warner, to explore a billion-dollar industry that’s essential to us all, but that few of us stop to ponder…
… Warner joins a long procession of icemen who have bemoaned the lack of interest in their trade. “We are so familiar with water in its liquid and its solid form, that we seldom think of it as a mineral, and still less as a mineral product of any considerable industrial importance,” wrote W. P. Blake, an American geologist and mining consultant, in an 1883 report on the country’s ice trade. And yet, he wrote, “the industry is peculiarly American, and in no other country has the business of cutting and storing ice been so well systematized and perfected.”
By the time of Blake’s findings, people had been experimenting with making and keeping ice for centuries. In India, possibly as early as three thousand years ago, people used clay pots to cool water: The water’s evaporation through the clay removed heat, leaving chilled water or even ice under the right conditions. The technique is still used, especially as the country experiences record heat waves.
Americans in the nineteenth century, the dawn of the modern ice industry, had it easier. “The natural supply of ice in the United States is almost beyond calculation,” wrote a U.S. census agent named Henry Hall in a report submitted in 1883. Since at least 1805 so-called natural ice had been harvested from northern lakes, rivers, and ponds in a process accurately and musically depicted in the opening scene of Frozen, a rare cinematic nod to the ice industry. (In Eugene O’Neill’s 1946 play, The Iceman Cometh, a salesman has told his alcoholic friends that his wife is at home with the iceman. The iceman in question is meant to evoke death—the woman has been killed—but anxieties around swole deliverymen entering homes and seducing wives seem to have been prevalent in the twentieth century.) Using long handsaws and a variety of improvised plows, Northerners would cut grids in the ice and remove blocks, which were then stored or sent to warmer locales by ship or rail in insulated containers.
Thanks to a man named Frederic Tudor, some of these destinations were quite far-flung. Tudor was a merchant from Boston, more mutton chop than man in his later years. He would ship natural ice from Thoreau’s Walden Pond, which is startlingly Whole Foods–y branding for the nineteenth century.
Tudor envisioned a global ice industry. Perhaps he was motivated by the limited market for his Gläce-priced ice blocks in the U.S. or by the prevalence elsewhere of tropical fevers such as yellow fever, as the symptoms of these were often soothed by cold water. (In 1851 a doctor named John Gorrie experimented with creating a cold sickroom for malaria patients’ high fevers, effectively inventing air-conditioning.) In 1806, Tudor attempted to ship blocks of ice to the island of Martinique, a speculation that is detailed by Jonathan Rees, a history professor at Colorado State University Pueblo, in Refrigeration Nation, one of three books he’s written about refrigeration. First, the owner of a boat Tudor had chartered got cold feet, convinced, as many shipowners were, that the ice would melt and sink the ship. Tudor chartered another ship and successfully delivered his wares to the island, but Martinique had no icehouse in which to store it, and it began to melt, as ice does. Customers also had no idea how to transport it from his hold to their homes or keep it cold once they did; Tudor advised them to wrap their purchases in cloth. “He still got complaints, since it melted anyway,” writes Rees.
Tudor could very well have gone down in history as the father of the modern Potemkin start-up rather than the father of the modern ice industry, but he persevered. He saw that in order to create the worldwide ice trade he envisioned, he would have to build a global network of icehouses. Eventually his empire grew vast, and historians call Tudor by the absolutely sick moniker the Ice King…
… By the mid to late nineteenth century, artificial ice makers were being invented across the globe. Texans—perhaps shaken by the Civil War, which hindered the shipment of ice, and also likely motivated by the state’s growing beef industry—were aggressive in the ice race. By 1867, notes Rees, when the United States had only eight ice plants, three existed in San Antonio. Some early refrigeration machines used compressed ammonia, which is still widely used as a coolant. In the coming decades, ice plants bloomed across the state like frost on a window.
In the late 1920s, Southland Ice Company had eight plants and 21 retail locations in Texas, from which it provided ice for the iceboxes of residents in surrounding areas. (Widespread adoption of refrigerators was still several decades away and was driven, Rees tells me, by the lure of ice in the home. “The argument was always, ‘Get rid of the iceman. Buy a refrigerator.’ ”) Southland eventually became Southland Ice Corporation, and its icehouses, which had grown into convenience stores called Tote’ms, were rechristened 7-Elevens. In 1972, as 7-Eleven was growing into the brand that would stain the lips of countless middle schoolers with its neon Slurpees, Southland rebranded its large ice operation, calling it Reddy Ice Division.
Reddy was not yet the acquisitive ice empire it is today. For most of the twentieth century, regional producers thrived. But then, in the early nineties, the packaged-ice industry encountered an innovation: the in-store bagger. Refrigerator ice makers already existed but were not a particularly virile threat, as it would take a long time for a refrigerator-door ice maker to fill a cooler. In-store ice baggers were a different story.
The machines had been perfected by a young man named Jim Stuart, a former accountant who had consulted for a company called Automatic Ice Machine, or A.I.M. Inspired by that work, he began selling what he called the Ice Factory, a machine that automatically made and packaged ice at grocery stores and other retailers that had previously bought their ice from local businesses. Stuart began acquiring these flailing producers. His Houston-based company, Packaged Ice, quickly achieved ice supremacy, and in 1998, Stuart bought Reddy. (It still makes the Ice Factory.) A 2001 New Yorker profile christened Stuart the Emperor of Ice…
[Larson reviews the uses to which we put ice– the social (American’s prefer their beverages chilled), but also the more industral: ice is critical to everything from construction (e.g., in high temps it’s used to keep concrete from setting too quickly and becoming brittle) to medical treatment and research…]
… Not far from Reddy’s headquarters is a storage facility with twelve thousand pounds of ice that’s kept on reserve—kept on ice!—for emergencies. When natural disasters level our critical systems, as ritually occurs in Texas, ice is suddenly even more crucial. “When a hurricane hits and power goes out, we’re a lifeline,” Warner says. “It’s not for drinks at that point. It’s ‘how do I keep my food cold?’ ” In the event of a crisis, Reddy works with H-E-B, Walmart, and the Federal Emergency Management Agency to distribute ice, often thousands of pounds of it. He vividly remembers when Hurricane Beryl tore through Houston soon after the Fourth of July in 2024. Celebrations had cleared out Reddy and its distributors’ reserves, leading them to scramble to get ice from across the country to Houston. “We had H-E-B calling us for ice, and we were just trying to get it anywhere we could,” Horton, of Polar Ice, recalls.
The moments when ice is needed but unavailable are as irritating and unsettling to us as the breakdown of any utility, even in much lower-stakes contexts than a hurricane’s aftermath. “Ice is actually a very high-passion business,” says Juan Estrada, who directs Reddy plants in the Metroplex and across the state. Customers might stop at a convenience store on the way to a party, gather some snacks, and then ask for a bag of ice at the checkout. If there is no ice available, Estrada says, they’ll likely abandon all their other purchases and walk out. For most of us, these small but searing disappointments are the only times we think about the role of ice in our lives.
But for many Texans, ice can be the only thing keeping us from succumbing to our surroundings. In 2024, Harris County Public Health reported that heat-related illnesses had increased by 329 percent between 2019 and 2023. Texans who are exposed to heat as part of their work in industries including agriculture, construction, and delivery—as is the case for more than 35 percent of Americans—are disproportionately vulnerable, as are older adults and children.
Those of us outside those groups are not immune. As early as March of this year, a ranger at Big Bend National Park tells me, she and her colleagues were responding to between four and six heat-related incidents each week. Rangers bring ice on almost every medical response; it’s crucial for stabilizing patients during what can be an hours-long journey from the park to a hospital. In the summer, says San Antonio Fire Department medic Ashley Long, everyone is vulnerable to the heat, even those who have been hydrating all day. Much like the ice distributors, Long responds to ten times as many emergencies when it’s hot. “The hospitals are just slammed. Every single bed is taken,” she says. “Every disease and debilitation that people have is magnified by the heat.”
Perhaps we don’t think much about ice because doing so requires us to consider how implausible it is that we’re able to live comfortably in such heat. How lucky we are to enjoy a snow cone on a one-hundred-degree day.
An invisible essential: “Inside the Billion-Dollar Industry That’s Keeping Your Beer Cold—and Saving Lives,” from @lonlozzin.bsky.social in @texasmonthly.bsky.social.
For a look at the even larger, even more infrastructurally-central, but equally opaque– ‘cold chain’: “Food is simply sunlight in cold storage.”
* Samuel Taylor Coleridge, The Rime of the Ancient Mariner
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As we stay cool, we might note that there’s still time to check in on World Water Week; today is its final day. While its in-person events are happening in Stockholm, much of the program is available online.
Why we should care (UK-centered, but all-too-relevant across the globe).




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