Quantcast
Environmental News for a Healthier Planet and Life

A Clever Fix to the Biggest Climate Problem

Climate
A Clever Fix to the Biggest Climate Problem

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 Institute of Refrigeration

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.

Related Articles Around the Web
Sunrise over planet Earth. Elements of this image furnished by NASA. Elen11 / iStock / Getty Images Plus

On Thursday, April 22, the world will celebrate Earth Day, the largest non-religious holiday on the globe.

Read More Show Less
EcoWatch Daily Newsletter
NASA has teamed up with non-profit Carbon Mapper to help pinpoint greenhouse gas sources. aapsky / Getty Images

NASA is teaming up with an innovative non-profit to hunt for greenhouse gas super-emitters responsible for the climate crisis.

Read More Show Less
Trending
schnuddel / iStock / Getty Images Plus

By Jenna McGuire

Commonly used herbicides across the U.S. contain highly toxic undisclosed "inert" ingredients that are lethal to bumblebees, according to a new study published Friday in the Journal of Applied Ecology.

Read More Show Less
A warming climate can lead to lake stratification, including toxic algal blooms. UpdogDesigns / Getty Images

By Ayesha Tandon

New research shows that lake "stratification periods" – a seasonal separation of water into layers – will last longer in a warmer climate.

Read More Show Less
A view of Lake Powell from Romana Mesa, Utah, on Sept. 8, 2018. DEA / S. AMANTINI / Contributor / Getty Images

By Robert Glennon

Interstate water disputes are as American as apple pie. States often think a neighboring state is using more than its fair share from a river, lake or aquifer that crosses borders.

Read More Show Less