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  Refrigeration: Cold in the bag – Knowledge | Bit Updates
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Refrigeration: Cold in the bag – Knowledge

Monday, September 18th, 2017 | bitcoin updates


Keep sensitive medicines and foods at low temperatures – this is no problem with a cooling unit. However, such devices are bulky and unsuitable for small items such as smartphone batteries. A new technology, presented in the "Science" journal, will now enable refrigeration in the shape of the hoses, which is suitable for mobile phones as well as for flexible cooling systems for injuries.Therms to cool cooling has been working since ancient times according to a simple scheme: such as ice used earlier in beer cellars – absorbs heat from a different material. While the ice melts slowly, the drinks cool off. The same function takes over the refrigerant in an air-conditioning system or in a refrigerator: First a compressor compresses this gas and warms it up. In the black cooling coils on the back of the unit, the coolant releases this heat to the environment and thus heats up the room slightly. At the same time, the refrigerant condenses, flows into the interior of the refrigerator, is allowed to expand and evaporate. The energy required for this takes the refrigerant out of its surroundings and thus lowers the temperature of the refrigerator and its contents. Then the cycle starts from the front. Overall, such a machine scoops out heat from the refrigerator and heats the environment. Even maximally miniaturized, such an apparatus remains much too bulky to cool the battery in a smartphone, for example. On the other hand, researchers have been promising some of the cold-peeled potatoes that are made of solid substances and are electrically driven for several decades. These include "Peltier elements" in which current flows through two semiconductors while heating one side of the element while the other is cooling. However, the materials required are quite expensive. Plastic film as coolant Qibing Pei from the University of California in Los Angeles and his colleagues use cold-peeling blades, which work according to the "electrocaloric effect". In this case, an electric field cools or heats a plastic film, which peels between two aluminum platelets. An electric field presses the foil against the upper plate and heats the plastic. This transfers the heat absorbed to the aluminum. If the field is subsequently reversed, it presses the wafer in a fraction of a second fraction against the lower aluminum plate, which cools it. To compensate, heat flows from the aluminum to the plastic and cools the light metal. Then the cycle starts from the front. This cooling technique hardly needs space: in the experiment, one element was seven centimeters long, three wide, and only 0.6 centimeters thick. And it cools quickly: A conventional smartphone battery cools by just three degrees Celsius under high load of 52 degrees Celsius in 30 seconds. Peis electrocaloric cooling creates eight degrees in just five seconds.

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