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Nissan is making waves with its latest innovation: a cutting-edge automotive paint designed to keep vehicle cabins cooler and reduce air-conditioning energy usage. This groundbreaking technology, developed in partnership with Radi-Cool, harnesses the power of metamaterials to tackle the summer heat and contribute to a more sustainable future.
A Cooler, More Efficient Ride
In November 2023, Nissan kicked off a 12-month feasibility trial at Tokyo International Air Terminal at Haneda. This trial, conducted in collaboration with Japan Airport Terminal Co., Ltd., Radi-Cool Japan, and All Nippon Airways (ANA) airport services, involves applying the new cool paint to a Nissan NV100 service vehicle operated by ANA.
The expansive tarmac at Haneda airport provided an ideal setting for real-world testing of the paint’s performance under extreme heat conditions. Preliminary results have been promising. Vehicles coated with Nissan's cool paint have shown up to a 12°C reduction in exterior surface temperatures and a 5°C cooler interior compared to those with traditional automotive paint.
How It Works
Nissan's cool paint incorporates advanced metamaterials—synthetic composites engineered with properties not typically found in nature. The paint contains two types of microstructure particles. One type reflects near-infrared rays, which typically cause traditional paint to heat up. The second particle is the key to the paint’s innovative cooling effect. It generates electromagnetic waves that counteract and redirect the sun's energy away from the vehicle into the atmosphere. This dual-action approach significantly reduces heat transfer to the vehicle's surfaces, such as the roof, hood, and doors.
Benefits Beyond Cooling
The advantages of this technology extend beyond just a cooler cabin. With a lower interior temperature, vehicles require less air-conditioning, which reduces strain on both the engine and the battery in electric vehicles. This improvement not only enhances comfort but also boosts overall vehicle efficiency.
Dr. Susumu Miura, senior manager and expert at Nissan’s Advanced Materials and Processing Laboratory, leads the development of this innovative paint. Known for his work on Nissan’s award-winning noise-reducing acoustic material, Miura is committed to making cars quieter, cooler, and more efficient. “My dream is to create cooler cars without consuming extra energy,” Miura explains. “This is particularly crucial in the EV era, where running air-conditioning in summer can significantly impact the vehicle’s state of charge.”
Overcoming Challenges
While radiant cooling paint is not a new concept, its use has primarily been limited to buildings and structures. Traditional radiant cooling paints are thick and often require a roller for application, leaving a chalky residue. Developing a version suitable for automotive use presented several challenges. Miura’s team had to ensure the paint could incorporate a clear topcoat, be applied via a spray gun, and meet Nissan's stringent quality standards.
Since the project began in 2021, over 100 samples have been tested. The team is currently evaluating a paint thickness of 120 microns—about six times thicker than standard automotive paint. The paint has proven resistant to salt, chipping, peeling, and scratches, while maintaining color consistency and repairability. As development continues, the team is also exploring options for thinner paints that still offer effective cooling.
Looking Ahead
Though still in the testing phase, Miura and his team are optimistic about the future. They envision the paint becoming available for special orders and potentially in a range of colors. There is strong potential for this technology in light commercial vehicles, such as vans, trucks, and ambulances, which are frequently exposed to the elements.
Stay tuned for more updates on this exciting development as Nissan continues to push the boundaries of automotive innovation.
For more information on Nissan’s latest advancements and to follow the progress of this cooling paint technology, visit the Nissan website.
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