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Magnetic cooling

Magnetic cooling is based on the magnetocaloric effect: the phenomenon that certain materials placed in a magnetic field heat up and then cool when the magnetic field is switched off.

This technique works as follows. First the material is placed in a magnetic field that regulates the magnetic spin, thus releasing heat. Then the heat that has been generated is fed through directly, or using a cooling medium, to the space or object that has to be heated. By then switching off the magnetic field, the regulation in the magnetic material is lost. Heat is required for this and it can be acquired directly or indirectly from the environment. This is the cooling effect.

Features

The key features of magnetic cooling are:

  • Virtually noise-free operation (no compressor);
  • High energy efficiency compared with Carnot;
  • Virtually no electrical energy necessary when using permanent magnets;
  • Causes no vibrations;
  • Large freedom of choice in the cooling means (no greenhouse gases necessary); direct cooling is also possible;
  • Presence of magnetic field;
  • Cooling capacity depends on size of the magnetic field.

TNO Built Environment and Geosciences also uses this technique for developing new equipment to climatise space.

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