2023-11-14 01:15:04
A decisive advance has been achieved in the field of passive radiative cooling. It is a new material with which coatings made from it achieve performances beyond those achieved by all other known materials of that type.
The new material, developed and studied by Kaixin Lin’s team at the City University of Hong Kong in China, is of the class known as cooling ceramics.
Its profitability, durability and versatility make it very suitable for commercialization in numerous applications, especially in building construction.
By reducing the thermal load of buildings and providing stable cooling performance even under diverse weather conditions in all climates, cooling ceramics improve energy efficiency and can combat global warming.
Passive radiative cooling is considered one of the most promising green cooling technologies to curb the growing demand for space cooling, reduce environmental pollution, and combat global warming.
Until now, passive radiative cooling systems based on nanophotonic structures have been limited by their high cost and poor compatibility with commonly used technology, while polymeric photonic alternatives do not withstand weathering well and suffer from other limitations.
The new cooling white ceramic applied to a roof. (Photo: City University of Hong Kong)
The new cooling ceramic achieves advanced optical properties and is much more compatible with commonly used technology.
The extraordinary uniqueness of cooling ceramic lies in its hierarchically porous structure. Another advantage is that it is easy to manufacture.
Furthermore, inspired by the exoskeleton surface of beetles of the genus Cyphochilus, the cooling ceramic effectively disperses solar radiation of a wide band of wavelengths, resulting in a solar reflectivity of 99.6% and high thermal emission. in the mid-infrared 96.5%. These advanced optical properties surpass those of current state-of-the-art materials.
In addition to its exceptional optical performance, cooling ceramic has excellent weather resistance, great chemical stability and high mechanical strength, making it ideal for long-term outdoor applications.
Kaixin Lin’s team presents the technical details of their new material in the academic journal Science, under the title “Hierarchically structured passive radiative cooling ceramic with high solar reflectivity.” (Source: NCYT from Amazings)
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