In a groundbreaking advancement poised to revolutionize automotive climate control, a team of researchers from Seoul National University, in collaboration with Massachusetts Institute of Technology and leading Korean automotive giants Hyundai and Kia, has unveiled a novel transparent radiative cooling film. This innovation directly addresses the persistent challenge of vehicle cabin overheating during summer, demonstrating an unprecedented ability to dissipate heat without additional energy consumption. Through meticulous experimentation on real vehicles across diverse climatic landscapes—including the United States, South Korea, and Pakistan—the technology has been shown to reduce interior temperatures by up to 6.1°C and slash cooling energy requirements by over 20%, marking a major leap toward sustainable transportation.
The core of this transformative technology lies in the scalable transparent radiative cooling (STRC) film, which seamlessly integrates into vehicle glass surfaces. Unlike conventional solutions such as Low-E coatings or tinting films that primarily block incoming solar radiation yet struggle with expelling internally accumulated heat, the STRC film operates on a radically different physical principle. It harnesses the power of radiative cooling, a passive mechanism whereby thermal energy from a warmer surface is emitted as infrared radiation into the cold outer space, effectively reducing heat accumulation without the need for electrical inputs.
Technically, the STRC film is a sophisticated multilayer structure engineered to maintain an impressive over 70% transmittance in the visible light spectrum, ensuring interior brightness and visibility remain uncompromised. Simultaneously, it selectively reflects near-infrared wavelengths—the primary components of solar heat—while efficiently emitting mid-infrared radiation from inside the vehicle to the ambient environment. This dual functionality represents a delicate balancing act of optical properties, achieved through advanced materials science and precise nanofabrication techniques.
One of the remarkable aspects of this research is its scalability and applicability to real-world conditions. The team performed extensive field tests, mounting the STRC film on sedan windows and evaluating performance under dynamic driving and stationary parking scenarios across seasons. Results confirmed consistent temperature regulation, signifying the technology’s resilience against variable solar intensities, atmospheric humidity, and operational modes. These findings represent a critical validation beyond laboratory prototypes, affirming the film’s readiness for commercial adoption.
The implications for energy consumption in automotive air conditioning systems are profound. By intercepting solar heat before it permeates the cabin and facilitating thermal emission, the STRC film substantially reduces the load on vehicle cooling systems. Empirical data indicated a more than 20% decrease in air conditioner energy usage, which translates into extended driving ranges for electric vehicles and diminished fossil fuel consumption for conventional engines. Moreover, the technology accelerated the time required to achieve a comfortable interior temperature by approximately 17 minutes, enhancing occupant comfort and reducing energy wastage.
Beyond summer benefits, the STRC film was rigorously tested during winter months, where its effects on heating energy demand were analyzed. Intriguingly, while the cooling advantages were pronounced, any increase in heating requirements due to infrared emission was minimal, ensuring year-round net energy savings. This overall efficiency positions the technology as a viable avenue for automotive decarbonization, aligning with global initiatives to reduce greenhouse gas emissions from transport sectors.
To contextualize its environmental impact, simulations based on widespread adoption across the United States estimate an annual reduction of approximately 25.4 million tons of CO2 emissions. This figure corresponds to taking roughly five million vehicles off the road, highlighting the STRC film’s potential contribution to national and global carbon neutrality goals. The convergence of material innovation, automotive engineering, and environmental science embodied in this project underscores the holistic approach required to tackle climate change challenges.
The invention has sparked interest not only in the academic and industrial communities but also in intellectual property domains. A Korean patent application (no. 1020230179087) has been filed by the inventors, securing rights over the STRC film technology. This move positions the research team and their partners strategically for collaborations, licensing deals, and mass production efforts to bring this technology to market.
Commenting on the research, Min Jae Lee, first author affiliated with Seoul National University and the Hyundai-Kia partnership, emphasized the significance of validating the film under real operational conditions, transcending prior studies confined to laboratory-scale evaluations. Professor Seung Hwan Ko echoed this sentiment, marking the work as the first experimental demonstration of transparent radiative cooling viable for practical vehicle environments. Their synergy has propelled the field toward a new era of passive thermal management.
The sophisticated multilayer design, material selection methodologies, and rigorous computational modeling underpinning the STRC film’s development reflect state-of-the-art innovation. This integration of theoretical photonics, nanoscale engineering, and practical automotive requirements typifies contemporary interdisciplinary research. The measured spectral properties, durability under prolonged solar exposure, and compatibility with existing vehicle manufacturing pipelines further attest to the film’s readiness for adoption.
As transportation electrification gains momentum worldwide, innovations like the STRC film that enhance energy efficiency without augmenting complexity or cost herald promising pathways for sustainable mobility. The film’s capacity to function autonomously, without electrical input, aligns with broader trends toward passive technologies in climate control systems, potentially inspiring applications beyond vehicles, in buildings and wearable devices.
Seoul National University, established in 1946 as South Korea’s first national university, exercises critical leadership in engineering research. The college’s commitment to nurturing global industry leaders is exemplified by this successful collaboration, which bridges academia and industry to foster impactful technologies. By pushing the envelope of radiative cooling applications, the research reaffirms the institution’s role in addressing pressing environmental challenges through innovation.
This milestone achievement invites further exploration into scalable manufacturing techniques, integration with diverse vehicle models, and synergy with other energy-saving technologies. The fusion of transparent radiative cooling with smart sensors or adaptive coatings could pioneer next-generation climate-responsive automotive glass, further enhancing passenger comfort and environmental sustainability. As the automotive industry accelerates toward carbon neutrality, solutions like the STRC film will be instrumental in shaping the future of mobility.
Subject of Research: Not applicable
Article Title: Towards decarbonization in transportation: scalable transparent radiative cooling for enhanced vehicle energy efficiency
News Publication Date: 4-Feb-2026
Web References: http://dx.doi.org/10.1039/D5EE06609C
References: Energy & Environmental Science, 2026
Image Credits: © Energy & Environmental Science, originally published in Energy & Environmental Science
Keywords
Transparent radiative cooling, vehicle energy efficiency, passive cooling, multilayer film, near-infrared reflection, mid-infrared emission, sustainable transportation, cabin temperature control, automotive glass, energy-saving technology, carbon reduction, scalable nanomaterials
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