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SEMINAR ON MAGNETIC REFRIGRATION Attractive ALTERNATIVE COOLING TECHNOLOGY

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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  1. BY : RAMAKANTH P JOSHI 1JS06ME034 SEMINAR ONMAGNETIC REFRIGRATIONAttractive ALTERNATIVE COOLING TECHNOLOGY

  2. outline Magnetocaloric effect Principle Prototype : Ames lab & astronaut corp America Advantages of magnetic refrigeration Technology comparison Future scope

  3. Ferromagnetic materials – alloy of Al, Ni,Fe,Co Paramagnetic materials – Cr,Mn, Pt, Pd, K, Cu. Diamagnetic materials – Zn, Bismuth, antimony. magnets

  4. 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

  5. Introduction • PRINCIPLE : Magnetocaloric effect due to variable field • Currie temperature • (768°C for Fe)

  6. 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

  7. Thermo dynamic cycle • Steps of thermodynamic cycle • Adiabatic magnetization • Isomagneticenthalpic transfer • Adiabatic demagnetization • Isomagnetic entropic transfer

  8. Graphical representation

  9. 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

  10. 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

  11. Working Materials

  12. comparison Analogy between magnetic refrigeration and vapor cycle refrigeration

  13. Technology comparison

  14. Green technology • Noise-less technology • Very high thermodynamic efficiency • Low energy consumption • Simple design and building • Long life • Low pressure Advantages of magnetic refrigeration

  15. Ideal applications House hold refrigerators appliances Central cooling systems Room air conditioners Supermarket refrigeration ( display cabinets)

  16. 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

  17. 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

  18. 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

  19. THANK YOU

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