Abstract
Abstract
Highlights
Background and principle of radiative coolingCooling is critical to a wide range of human activities, such as food preservation, air conditioning, and large-scale computation
If a surface absorbs sunlight less than the energy it radiates to the cold outer space, this surface will lose heat to the outer space, and electricity-free cooling can be achieved even in day time [Fig. 1(a)]
This is the basic principle of passive daytime radiative cooling (PDRC).[3,4,5]
Summary
Cooling is critical to a wide range of human activities, such as food preservation, air conditioning, and large-scale computation. Compression-based cooling systems are prevalently used for cooling. They consume substantial amounts of electricity and generate a large quantity of CO2. The typical gaseous media used in compression is either ozonedepleting or has a strong greenhouse effect.[1] such a cooling strategy only moves heat from one location to another on the earth surface, together with converting work to heat. The net effect is heating instead of cooling, leading to various issues such as the urban heat island (UHI) effect and thermal pollution.[2] These issues are getting worse under global warming, which requires more energy for cooling. Inexpensive and eco-friendly approaches with net cooling capability are desirable for reducing energy costs and
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