Subambient daytime radiative cooling (SDRC) provides a promising electricity- and cryogen-free pathway for global energy-efficiency. This project has led to the development of an eco-friendly, self-cleaning, durable and cost-effective SDRC coating. The coating cools the buildings under direct sunlight in summer without the use of electricity. It can achieve a day-time enhanced yet nighttime suppressed sub-ambient cooling effect.
Building cooling during hot weather is critically important to our society. The peak demands of building cooling in cities pose a great challenge to power grids and may cause power blackouts. Moreover, the refrigerant gases used in air conditioners are one of the largest contributors to greenhouse gas emissions. Environmentally friendly building cooling solutions should be pursued.
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