Sunflower-Inspired Cooling System Improved Efficiency
Researchers developed a steering mechanism that keeps surfaces cooler by tilting away from direct sunlight.
Updated on Sept. 28, 2026 in Energy
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Scientists created a dynamic radiative cooling system that increases cooling flux by 135 percent at solar noon. The technology uses a solar sensor and gimbal to steer the emitter away from sunlight, which typically hinders the cooling process.
Why it matters
Radiative cooling is often offset by sunlight during the day, making it difficult to maintain cold surfaces. This new system minimizes solar exposure, allowing for significant improvements in thermal performance.
The system utilizes a dual-axis gimbal and solar sensor to manage a selective radiative-cooling paint with 4.6 percent solar absorptivity. The mechanism requires an average of 2 W/m² of power to function.
The details
By mimicking the movement of sunflowers, the emitter tilts to reduce the surface area exposed to solar beams. In experiments, this setup achieved 2.2°C below ambient air temperature, while an even more absorbent black-paint emitter reached 5.1°C below ambient.
Timeline
2017: Nature Energy study on fluid cooling panels published.
2018: Nature Communications study on directional radiative cooling published.
June through September: Period for energy benefit model case studies.
September 2026: Researchers reported work in an arXiv preprint.
The Big Picture
This development follows the precedent set by the 2018 Nature Communications study on directional radiative cooling. It marks a significant advancement by incorporating active steering to overcome previous limitations in passive cooling technology.
The technology could lead to substantial reductions in building energy consumption, with models predicting summer savings of up to 200 kWh/m². Future applications may result in more efficient climate control systems for residential and commercial structures.
The takeaway
This system demonstrates that active movement can significantly enhance passive cooling technologies. Implementing such designs could drastically lower the energy demand for cooling buildings during peak summer months.
Further reading
Learn more about the latest innovations in Energy research.
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