Existing refrigerants It has some flaws Some passively emit the absorbed heat and transfer it directly to the buildings. Others that reflect sunlight don’t do well in hot, humid, or cloudy weather. Therefore, Yu Fu, Kai Zhang and their colleagues wanted to develop a durable material that could reflect sunlight, Passive heat release and heat transfer prevention.
Scientists are online Cellulose nanocrystals with silane bridgeThen it is frozen and dried under vacuum. As a result of this process, the nanocrystals were arranged vertically, resulting in the formation of a light white foam that is 96% reflective. Visible light and emission of 92 percent. absorb infrared rays.
After placing it on an aluminum lined box standing outside, The material kept the temperature inside the box 9 degrees Celsius lower than outside. When cellulose foam is compressed, its cooling capacity decreases, revealing the ability to tune its cooling properties.
Scientists have estimated that applying foam to the roof and exterior walls of a building can Reducing energy demand for cooling by an average of 35.4% Since the performance of wood-based cellulose foam can be modified according to weather conditions, this technology can be used in a variety of environments.
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