Nissan is trialing an innovative automotive paint designed to reduce a vehicle's cabin temperature and lower the energy usage of the air-conditioning system. Developed with Radi-Cool, this paint incorporates metamaterials, synthetic composites with unique properties.
The initiative is part of Nissan's efforts to foster sustainable innovations. In November 2023, Nissan began a 12-month trial at Tokyo International Air Terminal at Haneda, applying the paint to a Nissan NV100 service vehicle operated by All Nippon Airways (ANA). Haneda’s open tarmac offers an ideal environment for testing the paint's performance under high temperatures.
Preliminary results are promising. Vehicles with Nissan’s cool paint show up to a 12°C reduction in exterior surface temperature and up to a 5°C cooler interior compared to those with traditional paint. This cooling effect is especially beneficial when vehicles are parked in the sun, reducing the need for extensive air-conditioning and improving overall efficiency.
The paint’s effectiveness comes from two microstructure particles. One reflects near-infrared rays, preventing heat generation, while the other emits electromagnetic waves to redirect heat away from the vehicle. These particles significantly reduce heat transfer to surfaces like the roof, hood, and doors.
Dr. Susumu Miura, leading the development, aims to create cooler cars without energy consumption. This is crucial for electric vehicles, where air-conditioning can impact battery charge. Miura's team has tested over 100 samples since 2021, focusing on a 120-micron thick layer, much thicker than typical automotive paint, ensuring it meets Nissan's quality standards.
While radiant cooling paint is commonly used in buildings, adapting it for automotive use presents challenges. It needs a clear topcoat, spray gun application, and durability. Miura’s team continues to explore thinner options that maintain cooling performance.
If successful, this paint could be available for special orders in various colors, with strong potential for commercial vehicles like vans, trucks, and ambulances.
Source: Nissan