Remember the many times you were dripping in sweat and wished for the smallest breeze just to feel a little cool, or the times when it was too cold outside and even 3 layers of clothing couldn’t save you from the bone chilling weather? Scientists claim to have found a solution to this problem and it sounds rather convincing and futuristic.
Scientists have developed a soft wearable patch that cools or warms a user’s skin to a comfortable temperature, an advance that may help save energy on air conditioning and heating.
The device is powered by a flexible, stretchable battery pack and can be embedded in clothing. It could provide personalised cooling and heating at home, work, or on the go, researchers said.
The soft, stretchy patch cools or warms a user’s skin to a comfortable temperature and keeps it there as the ambient temperature changes.
“This type of device can improve your personal thermal comfort whether you are commuting on a hot day or feeling too cold in your office,” said Renkun Chen, a professor at University of California (UC) San Diego who led the study.
The patch is made of thermoelectric alloys—materials that use electricity to create a temperature difference and vice versa — sandwiched between stretchy elastomer sheets. The device physically cools or heats the skin to a temperature that the wearer chooses.
“You could place this on spots that tend to warm up or cool down faster than the rest of the body, such as the back, neck, feet or arms, in order to stay comfortable when it gets too hot or cold,” said Sahngki Hong, a UC San Diego who worked on the project as a PhD student in Chen’s lab.
The researchers embedded a prototype of the patch into a mesh armband and tested it on a male subject. Tests were performed in a temperature-controlled environment.
In two minutes, the patch cooled the tester’s skin to a set temperature of 32 degrees Celsius. It kept the tester’s skin at that temperature as the ambient temperature was varied between 22 and 36 degrees Celsius.
The ultimate goal is to combine multiple patches together to create smart clothing that can be worn for personalised cooling and heating. So engineers designed a soft electronic patch that can stretch, bend and twist without compromising its electronic function.
The team is now working on patches that could be built into a prototype cooling and heating vest. They hope to commercialize the technology in a few years.