Aug
13
New Fabric Keeps You Cool Even Without A/C
August 13, 2020 | Leave a Comment
Researchers at Donghua University, Shanghai, China have developed a material that cools the wearer without using any electricity. The fabric transfers heat, allows moisture to evaporate from the skin and repels water. According to the U.S. Energy Information Administration air conditioning and other space cooling methods account for about 10% of all electricity consumption in the U.S.
The researchers’ study paper has been published in ACS Applied Materials & Interfaces.
Cooling off a person’s body is much more efficient than cooling an entire room or building. Various clothing and textiles have been designed to do just that, but most have disadvantages, such as poor cooling capacity; large electricity consumption; complex, time-consuming manufacturing; and/or high cost. Yang Si, Bin Ding and colleagues wanted to develop a personal cooling fabric that could efficiently transfer heat away from the body, while also being breathable, water repellent and easy to make.
The researchers made the new material by electrospinning a polymer (polyurethane), a water-repelling version of the polymer (fluorinated polyurethane) and a thermally conductive filler (boron nitride nanosheets) into nanofibrous membranes. These membranes repelled water from the outside, but they had large enough pores to allow sweat to evaporate from the skin and air to circulate.
The boron nitride nanosheets coated the polymer nanofibers, forming a network that conducted heat from an inside source to the outside air. In tests, the thermal conductivity was higher than that of many other conventional or high-tech fabrics. The membrane could be useful not only for personal cooling, but also for solar energy collection, seawater desalination and thermal management of electronic devices, the researchers say.
Well, OK! But your humble writer will prefer both the fabric and the cooled room. This will be a welcome material across great swaths of the world’s population. Its quite interesting that the whole project seems to be coming out of China’s own innovation.
Perhaps with this kind of clothing those deep thermostat settings will be a thing of the past.
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