Cooling and heating are energy-intensive processes, either directly or indirectly powered by fossil fuels. A passive approach that does both is great for the climate.
Deserts see radical temperature changes within a day, similar to the shift of seasons in other parts of the world. During the day, the temperature soars, and as soon as the sun sets, it starts dipping, leading to cold nights. Desert creatures have long adapted to these drastically changing conditions, and the Chinese researchers turned to one such animal to serve as a model.
The Namaqua chameleon in southwestern Africa changes its color to regulate its body temperature as conditions change in the desert. When the sun is out, the chameleon turns grey to reflect the sunlight and remain cool. As the sky goes dark, the skin color changes to a dark brown to absorb more heat and stay warm.and tiles developed in the past have shown some impressive results but are limited for use in just one season.
The team further increased the temperature of the metal to 175 degrees Fahrenheit , but the material showed no signs of damage., in outdoor tests on miniature buildings the size of a doghouse throughout all four seasons. The coating remained warmer in winter than passive radiative cooling; in summer, the layer was cooler than tiles and white paint. During spring and fall, the coating was the only material that adapted to changing conditions and switched from heating to cooling during the day.The highly reflective solar radiation of passive daytime radiative cooling increases heating energy consumption in the cold winter.
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