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Magnetic refrigeration principle & Technology

 

A bit of History

 

Some classes of materials, called Magnetocaloric Materials (MCM), heat up when immersed in a magnetic field and cool down when removed from it, almost instantaneously. The phenomenon, known as Magnetocaloric Effect (MCE), was discovered by E. Warburg in 1881.

 

In 1933, W. Giauque was the first to use the Magnetocaloric Effect (MCE) in a magnetocaloric system that reached a very low temperature (0.25K). W. Giauque received a Nobel Prize in 1949.

 

In 1997, the Ames Laboratory implemented a proof-of-concept using Gadolinium. Reacting at ambient temperature (~20°C), the use of Gadolinium was a milestone for all developments of magnetic refrigeration systems for commercial applications.

 

 Magnetic Refrigeration Historic - Cooltech Applications

 

 

 

The physical principle

 

Magnetic refrigeration is based on the Magnetocaloric Effect (MCE). The MCE implies that the temperature of suitable materials (Magnetocaloric Materials, MCM) increases when they are exposed to a magnetic field and decreases when they are removed from it, that is, the effect is reversible and almost instantaneous.

 

The temperature with the strongest effect (the Curie temperature) depends on the properties of each material. The power generated by the system depends on the type of materials and their characteristics (mass and shape).

 

 

Magnetic Refrigeration Principle - Cooltech Applications

E = m.Cp.Δt

E : Energy
m : Mass of the magnetocaloric material
Cp : Thermal capacity of the material
Δt : Temperature increment

            
 

In a Magnetic Refrigeration System, a controlled magnetic field applies a series of Magnetization-Demagnetization cycles to the magneto-caloric alloys. Each of these cycles creates a temperature gradient in the material. A rapid succession of these cycles produces the final and stabilized hot and cold temperatures in the refrigerated system.

 

The Compact Magnetic Refrigeration System (MRS)


Plug-in MRS
Compact MRS
  • Cold Power: 200W to 1kW


  • Water based fluid (GWP = 0)


  • Low electricity consumption 


  • Applicable to every light applications


With a refrigeration power of 400W and a temperature span of 25°c, the Magnetic Refrigeration System (MRS) can be used in a medical refrigerator, a wine cellar, a professional refrigerator or a plug-in display case.

 

Thanks to its small form factor and its flexible design, the Magnetic Refrigeration System can be easily integrated into your refrigeration system. For more information regarding Cooltech’s device, please, Contact us.


General functioning of the Cooltech’s Magnetic Refrigeration System integrated into a refrigerated display cabinet:    MRS - Integration system - Cooltech Applications

The production facility


At Cooltech, we created the infrastructure for:


  • Production line

  • Optimizations

  • Testing

  • Metrology and quality

  • Product life-cycle management (PLM)

 


 

Manual assembly line - Cooltech Applications

 

Automatic assembly line - Cooltech Applications