SOLAR MAGNETIC

REFRIGERATION

M.JYOTHI KUMAR CH. PRASHANTH MECHANICAL ENGINEERING

KAMALA INSTITUTE OF TECHNOLOGY & SCIENCE

SINGAPURAM, KARIMNAGAR

CONTENTS

INTRODUCTION

DRAW BACKS PRESENT REFRIGERATION

SYSTEM

INTRODUCING SMR

ENERGY CONVERSTIONS

MECHANISM OF ENERGY CONVERSTION

MERITS &DEMERITS

CONCLUSION

INTRODUCTION

•Refrigeration is the process of

removing heat from an enclosed

space, or from a substance.

•Primary purpose of refrigeration is

lowering the temperature of

enclosed space and then maintaining

that lower temperature

DRAW BACKS

REFRIGERENT:

DUE TO THE EMPLOYMENT OF

REFRIGERENTS DEPLETION OF OZONE

LAYER IS TAKING PLACE WHICH RESULTS

IN THE GLOBAL WARMING

INTRODUCING SMRSMR(SOLAR MAGNETIC REFRIGERATION)

which is the combination of two projects

1. SOLAR ELECTRICITY (Converting sun’s

light energy in to electrical energy)

2. MAGNETIC REFRIGERATION(Magnetic

refrigeration is a cooling technology based on the

magneto caloric effect)

Solar cycle

PRINCIPLE OF MR

Magneto calorific effect is a magneto-

thermodynamic phenomenon in which

reversible change in temperature of a

material is caused due to a changing

magnetic field

If a temperature of magnet is increased from lower to

higher range at certain temperature magnet looses the

magnetic field.

Currie temperature Depends on individual property of

each material

As Energy input to the magnet is increased the

orientation of the magnetic dipoles in a magnet starts

loosing orientation and vice versa. At Currie temperature

as magnet looses energy to the media it regains the

property.

Currie effect

STEPS IN MR CYCLE

Adiabatic magnetization

Isomagnetic enthalpy transfer

Adiabatic demagnetization

Isomagnetic entropic transfer

• The increasing external magnetic field

(+H) causes the magnetic dipoles of

the atoms to align

• The net result is that the item heats

up (T + ΔT)

Adiabatic magnetization:

• This added heat can then be removed

by a fluid like water

• The magnetic field is held constant to

prevent the dipoles from reabsorbing

the heat

Isomagnetic enthalpic transfer

• The substance is returned to another

adiabatic (insulated) condition so the total

entropy remains constant

• thermal energy causes the domains to

overcome the field, and thus the sample

cools

Adiabatic Demagnetization

The magnetic field is held

constant to

prevent the material from heating

back up

The material is placed in thermal

contact with the environment

being refrigerated

Isomagnetic entropic transfer

Operation:

cooling

DEMAGNETIZATION

PARAMAGNETICMATERIAL

MAGNETIZATION

Comparison between Magnetic Refrigeration and Vapor Compression Refrigeration

Magnetic household refrigeration appliances

Magnetic cooling and air conditioning in buildings and houses

Central cooling system

Refrigeration in medicine

Cooling in food industry and storage

Cooling in transportation

Cooling of electronic equipment

applications

MR do not use hazardous or environmentally damaging chemicals

Purchase cost may be high, but running costs are 20% less than the conventional chillers

Ozone depleting refrigerants are avoided in this system, hence it more eco-friendly

Operation is quite as this system does not have compressor

High efficiencyExtremely low temperatures are possible(< 1k)

Advantages of Magnetic Refrigeration

High initial cost

Problems of thermal and magnetic

hysteresis

Technical difficulties in construction

Limitations:

Conclusion:

Magnetic refrigeration is a

technology that has proven to be

environmentally safe. Computer models

have shown 25% efficiency improvement

over vapor compression systems.

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