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SEMINAR ON MAGNETIC REFRIGRATION Attractive ALTERNATIVE COOLING TECHNOLOGY PowerPoint PPT Presentation


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BY : RAMAKANTH P JOSHI 1JS06ME034. SEMINAR ON MAGNETIC REFRIGRATION Attractive ALTERNATIVE COOLING TECHNOLOGY. outline. Magnetocaloric effect Principle Prototype : Ames lab & astronaut corp America Advantages of magnetic refrigeration Technology comparison Future scope.

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SEMINAR ON MAGNETIC REFRIGRATION Attractive ALTERNATIVE COOLING TECHNOLOGY

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BY :

RAMAKANTH P JOSHI

1JS06ME034

SEMINAR ONMAGNETIC REFRIGRATIONAttractive ALTERNATIVE COOLING TECHNOLOGY


outline

Magnetocaloric effect

Principle

Prototype : Ames lab & astronaut corp America

Advantages of magnetic refrigeration

Technology comparison

Future scope


Ferromagnetic materials – alloy of Al, Ni,Fe,Co

Paramagnetic materials – Cr,Mn, Pt, Pd, K, Cu.

Diamagnetic materials – Zn, Bismuth, antimony.

magnets


  • Expansion and compression of gas <30%Fridge, Bicycle pump

  • Evaporation of liquids very robustplants, animals, weather

  • Peltier effects not very efficientRadiators

  • Magnetic refrigeration ~60%Proof of principle apparatus

    ( Cooling with the help of external magnetic field)

WAYS TO COOL


Introduction

  • PRINCIPLE : Magnetocaloric effect due to variable field

  • Currie temperature

  • (768°C for Fe)


Demonstration of MCE

In a small physics experiment the magneto calorific effect in a gadolinium sample is demonstrated. Magnetization heats the sample up and demagnetization cools it down

B


Thermo dynamic cycle

  • Steps of thermodynamic cycle

  • Adiabatic magnetization

  • Isomagneticenthalpic transfer

  • Adiabatic demagnetization

  • Isomagnetic entropic transfer


Graphical representation


regenerators

(a) Tubes – Cu or Ag

(b) Perforated plates – stainless steel

(c) Wire screens - Cu

(d) Particle beds – ceramic or metal sphere

AIM : To achieve good thermal conductivity


  • Large magneto calorific effect

  • Significant MCE at reasonable fields

  • Curie temperature

  • Environment friendly materials

  • Affordable, abundant and easily synthesizable materials

Desired Properties of working materials


Working Materials


comparison

Analogy between magnetic refrigeration and vapor cycle refrigeration


Technology comparison


  • Green technology

  • Noise-less technology

  • Very high thermodynamic efficiency

  • Low energy consumption

  • Simple design and building

  • Long life

  • Low pressure

Advantages of magnetic refrigeration


Ideal applications

House hold refrigerators appliances

Central cooling systems

Room air conditioners

Supermarket refrigeration ( display cabinets)


Future scope

  • Less mass of magnet by 3-d field concentration

  • Higher volume fractions of porous structures

  • Higher frequencies of rotation

  • Application of hybrid materials


CONCLUSION

  • MCE : dH implies dS

  • Magnetic refrigeration can be cycled

  • Magnetic refrigeration demonstrated to be

  • most efficient

  • very compact

  • eco friendly

  • Trouble free

  • Prominent MCE materials for room temperature : Rare earth metals.

Use of Magnetic refrigerator reduces wastage of energy


BIBLIOGRAPHY

BASIC AND APPLIED THERMODYNAMICS by Dr. P K Nag 2/e TMH publication

www.wikipedia.com

www.freepatentsonline.com

www.globlespec.com

Research paper: magnetic refrigeration by JEFF JOHNSON


THANK YOU


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