Magnetocaloric Material

Environmental Friendly Refrigeration with CALORIVAC

CALORIVAC® is a magnetocaloric alloy enabling solid state energy conversion such as magnetic refrigeration. It enables engineers to build gas-free magnetic refrigeration using magnetocaloric alloys as active materials

Benefits:

  • Non-toxic, cost-efficient magnetocaloric alloy for magnetic refrigeration
  • Enables the design of environmentally friendly, gas-free refrigeration and air-conditioning devices
  • Future proof technology with no legislative pressure on the end-user
  • Alternative areas of use are direct conversion of low-grade waste-heat in to electricity
  • Active area of R & D with sample quantities available upon request

Details

Different machines for energy conversion are possible

  • Refrigeration and air conditioning devices
    • Mechanical energy required to turn a magnet is used to pump heat from a lower temperature level to a higher temperature level
  • Low grade waste heat conversion
    • Switching the magnetic state of the magnetocaloric material using hot and cold fluids electrical or mechanical energy can be generated
  • Adiabatic temperature change of 2 to 4 K @ 1.5 T magnetic field change 
  • Entropy change of 5 to 20 J/kgK @ 1.5 T magnetic field change
  • Magnetocaloric alloys covering a temperature range from 100 to 350 K enabling their use in a multitude of applications
  • Thermal conductivity of about 8 W/mK

To satisfy the new F-gas regulation the refrigeration and air conditioning industry is suffering from the phase-down of hydrofluorocarbons. Magnetic refrigeration can offer a more energy efficient, completely gas-free and future proof alternative. By magnetizing and demagnetizing magnetocaloric alloys, heat can be moved from a colder temperature level to a higher temperature level – the classical principle of a heat pump or refrigerator.

Different machines for energy conversion are possible

  • Refrigeration and air conditioning devices
    • Mechanical energy required to turn a magnet is used to pump heat from a lower temperature level to a higher temperature level
  • Low grade waste heat conversion
    • Switching the magnetic state of the magnetocaloric material using hot and cold fluids electrical or mechanical energy can be generated
  • Adiabatic temperature change of 2 to 4 K @ 1.5 T magnetic field change 
  • Entropy change of 5 to 20 J/kgK @ 1.5 T magnetic field change
  • Magnetocaloric alloys covering a temperature range from 100 to 350 K enabling their use in a multitude of applications
  • Thermal conductivity of about 8 W/mK

To satisfy the new F-gas regulation the refrigeration and air conditioning industry is suffering from the phase-down of hydrofluorocarbons. Magnetic refrigeration can offer a more energy efficient, completely gas-free and future proof alternative. By magnetizing and demagnetizing magnetocaloric alloys, heat can be moved from a colder temperature level to a higher temperature level – the classical principle of a heat pump or refrigerator.

CALORIVAC CTYPICAL MAGNETIC ENTROPY CHANGE AND ADIABATIC TEMPERATURE CHANGE FOR DIFFERENT EXTERNAL MAGNETIC INDUCTION CHANGES

FWHM VALUES (FULL WIDTH AT HALF MAXIMUM) GIVE THE FULL WIDTH AT HALF MAXIMUM VALUE OF THE RESPECTIVE QUANTITY

This table shows the isothermal entropy change for different values of external magnetic induction changes:

   1.50 T  1.25 T 1.00 T  0.80 T
  ∆ ST
KJ/m³K
FWHM
K
∆ ST
kJ/m³K
FWHM
K
∆ ST
kJ/m³K
FWHM
K
∆ ST
kJ/m³K
FWHM
K
250 °C 81 10 74 9 61 9 47 8
260 °C 76 11 69 11 57 10 44 9
270 °C 68 14 62 14 51 13 39 12
280 °C 61 16 55 16 45 15 36 14
290 °C 54 19 48 18 39 17 30 16
300 °C 46 21 41 20 33 19 25 18
310 °C 39 23 34 23 27 22 21 21
320 °C 32 26 27 25 22 24 16 23

 

This table shows the adiabatic temperature change for different values of external magnetic induction changes:

  1.50 T 1.25 T 1.00 T  0.80 T
  ∆ Tad
K
FWHM
K
∆ Tad
K
FWHM
K
∆ Tad
K
FWHM
K
∆ Tad
K
FWHM
K
250 °C 2.7 12 2.3 11 1.9 11 1.5 10
260 °C 2.6 14 2.2 13 1.8 12 1.5 11
270 °C 2.6 16 2.2 15 1.8 14 1.5 13
280 °C 2.5 19 2.1 17 1.7 16 1.4 15
290 °C 2.4 21 2 20 1.7 18 1.4 17
300 °C 2.3 23 2 22 1.6 20 1.3 19
310 °C 2.2 26 1.9 24 1.6 22 1.3 21
320 °C 2.2 28 1.8 26 1.5 24 1.2 23

 

 

 

 

CALORIVAC HTYPICAL MAGNETIC ENTROPY CHANGE AND ADIABATIC TEMPERATURE CHANGE FOR DIFFERENT EXTERNAL MAGNETIC INDUCTION CHANGES

FWHM VALUES (FULL WIDTH AT HALF MAXIMUM) GIVE THE FULL WIDTH AT HALF MAXIMUM VALUE OF THE RESPECTIVE QUANTITY

This table shows the isothermal entropy change for different values of external magnetic induction changes:

   1.50 T  1.25 T 1.00 T  0.80 T
  ∆ ST
KJ/m³K
FWHM
K
∆ ST
kJ/m³K
FWHM
K
∆ ST
kJ/m³K
FWHM
K
∆ ST
kJ/m³K
FWHM
K
250 °C 55 10 49 9 42 8 36 7
260 °C 62 9 56 8 49 7 43 6
270 °C 71 9 66 8 59 6 52 6
280 °C 81 8 76 7 69 6 62 5
290 °C 91 7 86 6 79 5 72 4
300 °C 101 7 96 6 89 4 82 4
310 °C 110 6 106 5 99 4 92 3
320 °C 120 5 115 4 109 3 101 2

 

This table shows the adiabatic temperature change for different values of external magnetic induction changes:

  1.50 T 1.25 T 1.00 T  0.80 T
  ∆ Tad
K
FWHM
K
∆ Tad
K
FWHM
K
∆ Tad
K
FWHM
K
∆ Tad
K
FWHM
K
250 °C 2.6 12 2.3 10 2 9 1.7 8
260 °C 2.9 11 2.5 10 2.1 9 1.8 8
270 °C 3.1 10 2.7 9 2.3 8 1.9 7
280 °C 3.4 9 3 8 2.5 7 2 7
290 °C 3.7 8 3.2 7 2.6 6 2.1 6
300 °C 4 7 3.4 6 2.8 6 2.3 5
310 °C 4.3 6 3.7 5 3 5 2.4 5
320 °C 4.6 5 3.9 4 3.1 4 2.5 4

 

 

Magnetocaloric Materials CALORIVAC

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