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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

BY :

RAMAKANTH P JOSHI

1JS06ME034

SEMINAR ONMAGNETIC REFRIGRATIONAttractive ALTERNATIVE COOLING TECHNOLOGY


Outline

outline

Magnetocaloric effect

Principle

Prototype : Ames lab & astronaut corp America

Advantages of magnetic refrigeration

Technology comparison

Future scope


Magnets

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

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

Diamagnetic materials – Zn, Bismuth, antimony.

magnets


Ways to cool

  • 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


Seminar on magnetic refrigration attractive alternative cooling technology

Introduction

  • PRINCIPLE : Magnetocaloric effect due to variable field

  • Currie temperature

  • (768°C for Fe)


Demonstration of mce

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

Thermo dynamic cycle

  • Steps of thermodynamic cycle

  • Adiabatic magnetization

  • Isomagneticenthalpic transfer

  • Adiabatic demagnetization

  • Isomagnetic entropic transfer


Graphical representation

Graphical representation


Regenerators

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


Desired properties of working materials

  • 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

Working Materials


Comparison

comparison

Analogy between magnetic refrigeration and vapor cycle refrigeration


Technology comparison

Technology comparison


Advantages of magnetic refrigeration

  • 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

Ideal applications

House hold refrigerators appliances

Central cooling systems

Room air conditioners

Supermarket refrigeration ( display cabinets)


Seminar on magnetic refrigration attractive alternative cooling technology

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


Seminar on magnetic refrigration attractive alternative cooling technology

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


Seminar on magnetic refrigration attractive alternative cooling technology

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


Seminar on magnetic refrigration attractive alternative cooling technology

THANK YOU


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