Cactus-inspired bilayer cooler for high-performance and long-term daytime passive cooling
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Implication
Experimental evaluation demonstrates an 8℃ temperature reduction under direct sunlight, indicating a viable passive cooling pathway for hot and arid environments.
Key Points
- A cactus-inspired bilayer passive cooler achieves sustained daytime passive cooling by coupling radiative cooling with thickness-regulated evaporative cooling.
- A temperature drop of ~8℃ occurs under direct sunlight alongside ~222 W m−2 of cooling power, overcoming ambient heating through an insulating aerogel layer.
- Field test evaluation of the particle-coated aerogel and hygroscopic hydrogel reveals that thickness tuning regulates water loss, indicating viable daytime passive cooling.
Cite This Study
Xu et al. (2024) studied this question.