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GS-III :
  • 12 October, 2019

  • 3 Min Read

Elastocaloric Effect

GS-III: Elastocaloric Effect.

News

Elastocaloric effect

  • When rubbers bands are twisted and untwisted, it produces a cooling effect.
  • This is called the “elastocaloric” effect, and researchers have suggested that it can be used in a very relevant context today.
  • Researchers have found that the elastocaloric effect, if harnessed, may be able to do away with the need of fluid refrigerants used in fridges and air-conditioners.
  • These fluids are susceptible to leakages, and can contribute to global warming.

How it works?

  • In the elastocaloric effect, the transfer of heat works much the same way as when fluid refrigerants are compressed and expanded.
  • When a rubber band is stretched, it absorbs heat from its environment, and when it is released, it gradually cools down.
  • In order to figure out how the twisting mechanism might be able to enable a fridge, the researchers compared the cooling power of rubber fibres, nylon and polyethylene fishing lines and nickel-titanium wires.

Efficiency:

  • The level of efficiency of the heat exchange in rubber bands “is comparable to that of standard refrigerants and twice as high as stretching the same materials without twisting”.
  • To demonstrate this setup, the researchers developed a fridge the size of a ballpoint pen cartridge that was able to bring down the temperature of a small volume of water by 8°C in a few seconds.

Source: Indian Express


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