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By Jeremy Deaton
Climate change is a big, unwieldy problem with no easy fix. To stem the rise in temperature, we need to transform how we power our homes, fuel our cars, grow our food and get rid of our waste. The change won't happen overnight, and time is running perilously short, which is why we need to prioritize actions that will have the biggest impact.
As it happens, the most effective way to fight climate change is to make a better fridge.
Manufacturers use a class of chemicals known as hydrofluorocarbons as refrigerants in air conditioners and refrigerators. Regrettably, hydrofluorocarbons are prone to leaking into the atmosphere, where they trap an enormous amount of heat—thousands of times more than carbon dioxide—worsening climate change. In 2016, countries agreed to end the use the use of hydrofluorocarbons, but the phase-out will take decades, and the substitute chemicals are either toxic, like ammonia, or flammable, like propane.
It seems there is no entirely safe way to cool down a conventional fridge. So, instead of trying to update existing technology, some manufacturers are building a new kind of fridge—one that doesn't make use of potentially dangerous refrigerants.
North Carolina-based Phononic, Inc. is building thermoelectric refrigerators that use less energy, take up less room and pose fewer environmental risks than conventional refrigerators. The company's name refers to phonons, quantum particles that transmit heat. "A phonon is quite literally a heat wave," said CEO Anthony Atti.
Phononic's thermoelectric technology represents a real breakthrough in refrigeration. To appreciate what makes it noteworthy, it helps to understand how it differs from a conventional refrigerator. The fridge in your home takes advantage of a long-understood fact of physics—when a liquid evaporates, it soaks up heat. That's why sweating cools you down. Sweat absorbs heat from your body as it evaporates into water vapor. Conversely, when that water vapor condenses, it releases heat. Refrigerators make use of this phenomenon to cool food.
Liquid refrigerant flows through what are known as evaporator coils inside the fridge, absorbing heat along the way. As the refrigerant heats up, it turns to gas. The hot gas flows through condenser coils outside the fridge, where it releases heat and turns back into a liquid. The compressor raises the pressure of the refrigerant, thereby raising its temperature. As a result, the temperature of refrigerant is significantly higher than the temperature of the room, and it cools off quickly.
The whole system serves to gather heat from inside the fridge and release it outside. That's why the coils on the back of a fridge feel so warm—they are releasing heat captured inside. While this basic technology has worked for around a century, it has a few shortcomings. The compressor uses a lot of energy, makes a lot of noise and takes up a great deal of space. And, as mentioned above, the most common refrigerant is an extremely powerful greenhouse gas.
A thermoelectric cooler. Luis María Benítez
Phononic does away with all of that. To cool a fridge, it makes use of the thermoelectric effect, by which an electrical current can produce a difference in temperature. Run a current through a thermoelectric cooler, and the device will draw heat from one side to the other. Thermoelectric coolers make very little noise, take up very little room and make no use of dangerous refrigerants like hydrofluorocarbons, ammonia or propane. Unfortunately, thermoelectric coolers have largely been too expensive and inefficient to be used in refrigeration.
With the help of a grant from a Department of Energy program that funds cutting-edge research, Phononic developed new materials that would make thermoelectric coolers more efficient. In addition to using less energy, Phononic's thermoelectric coolers chill the inside of a fridge more slowly and evenly than the machinery inside a conventional fridge.
A Phononic thermoelectric cooler (left) and a compressor (right) that might be found in a conventional fridge. Phononic
"Because you're removing that heat and using the entire surface area of the product itself, the rejected heat is very low temperature, so we can stack multiple refrigerators in a room," Atti said. "We can stack them on top of one another. We can build them into cabinetry, and you don't have that high waste heat temperature that a typical compression system does."
Phononic is deploying this technology in a variety of ways—cooling electronics, chilling wine, refrigerating medicine and vaccines at hospitals, among other applications. Soon, the technology could be deployed in food delivery, which may cut down on waste from meal kit services, like Blue Apron or HelloFresh. These companies deliver food in packages lined with ice packs so the ingredients survive shipping. Those ice packs inevitably end up in the trash. Atti imagines instead using energy-efficient, battery-powered thermoelectric coolers on delivery trucks to keep food cold until it reaches its final destination.
A Phononic refrigerator. Phononic
"What we're proposing is that you would put one of our refrigerators or freezers right on the delivery truck, so this way you just pull the package right out and deliver it right to the door," Atti said. The company does not currently produce consumer refrigerators or air conditioners, but it could make a dent in those markets as it drives down costs. "We're not afraid to compete on cost, but what we're trying to demonstrate—and we've had a decent level of success—is how, at this stage, we can compete on value."
Atti believes the technology could be a game changer. The way that solar technology is transforming energy and LEDs are changing lighting, thermoelectric coolers could give a long overdue makeover to refrigerators, freezers and air conditioners. The researcher turned investor turned entrepreneur said, "One of the things that irritated me when I was on the investment side was this belief that clean tech or sustainability could not be competitive." Now, he's intent on showing that next-generation refrigerators will do exactly that.
Reposted with permission from our media associate Nexus Media.
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Wolves and Jaguars Are Already Threatened by Border Razor Wire As Trump Vetoes Bid to Block Emergency Wall Funding
President Donald Trump issued the first veto of his presidency Friday, overturning Congress' vote to block his national emergency declaration to fund a border wall that environmental advocates say would put 93 endangered species at risk. However, the president's decision came the same day as an in-depth report from UPI revealing how razor wire placed at the border in the last four months already threatens wildlife.
Yet another whale has died after ingesting plastic bags. A young male Cuvier's beaked whale was found washed up in Mabini, Compostela Valley in the Philippines Friday, CNN reported. When scientists from the D' Bone Collector Museum in Davao investigated the dead whale, they found it had died of "dehydration and starvation" after swallowing plastic bags―40 kilograms (approximately 88 pounds) worth of them!
By Joe Sandler Clarke
"Don't expect us to continue buying European products," Malaysia's former plantations minister Mah Siew Keong told reporters in January last year. His comments came just after he had accused the EU of "practising a form of crop apartheid."
A few months later Luhut Pandjaitan, an Indonesian government minister close to President Joko 'Jokowi' Widodo, warned his country would retaliate if it was "cornered" by the EU.
By Luis Torres
For some people who live along the U.S.-Mexico border, President Trump's attempt to declare a national emergency and extend the border wall is worse than a wasteful, unconstitutional stunt. It's an attack on their way of life that threatens to desecrate their loved ones' graves.
At least 150 people have died in a cyclone that devastated parts of Mozambique, Zimbabwe and Malawi over the weekend, The Associated Press reported Sunday. Cyclone Idai has affected more than 1.5 million people since it hit Mozambique's port city of Beira late Thursday, then traveled west to Zimbabwe and Malawi. Hundreds are still missing and tens of thousands are without access to roads or telephones.
"I think this is the biggest natural disaster Mozambique has ever faced. Everything is destroyed. Our priority now is to save human lives," Mozambique's Environment Minister Celso Correia said, as AFP reported.