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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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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 robust plants, animals, weather
  • Peltier effects not very efficient Radiators
  • Magnetic refrigeration ~60% Proof of principle apparatus

( Cooling with the help of external magnetic field)

WAYS TO COOL
slide5

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
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
comparison
comparison

Analogy between magnetic refrigeration and vapor cycle refrigeration

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)

slide21

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
slide22

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

slide23

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

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