This document summarizes magnetic refrigeration technology. It discusses how magnetic refrigeration uses the magnetocaloric effect to produce cooling through applying and removing a magnetic field to magnetic materials. The document outlines the basic thermodynamic cycle of magnetic refrigeration and compares it to a vapor compression cycle. It also discusses some promising magnetocaloric materials and challenges to overcome like reducing costs and improving efficiency to enable widespread commercial applications of magnetic refrigeration.
Principle and mechanism for generating cooling effect using the magnet..
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Introduction to Magnetic RefrigerationSamet Baykul
DATE: 2019.05.12
We have given a lecture to the class in the course of "Refrigeration Systems" in ODTÜ.
● Introduction
● History and Developments
● Physical Phenomenas
● Thermodynamics of Magnetic Refrigeration
● Magnetocaloric Materials
● Future of Magnetic Refrigeration
● Developments
● Usage Areas
● Conclusion
seminar on Magnetic Refrigeration - Solid refrigerantVishal Talape
for most common and probable questions asked in interviews
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https://www.youtube.com/watch?v=yyh53wr_XfY
Magnetic refrigeration, or adiabatic demagnetization, is a cooling technology based on the magneto caloric effect, an intrinsic property of magnetic solids.
A strong magnetic field is applied to the refrigerant, forcing its various magnetic dipoles to align and putting these degrees of freedom of the refrigerant into a state of lowered entropy.
Principle and mechanism for generating cooling effect using the magnet..
For any other enquiry u can contact me on +919540278218....
and can join my Page www.facebook.com/engineeringindia
Introduction to Magnetic RefrigerationSamet Baykul
DATE: 2019.05.12
We have given a lecture to the class in the course of "Refrigeration Systems" in ODTÜ.
● Introduction
● History and Developments
● Physical Phenomenas
● Thermodynamics of Magnetic Refrigeration
● Magnetocaloric Materials
● Future of Magnetic Refrigeration
● Developments
● Usage Areas
● Conclusion
seminar on Magnetic Refrigeration - Solid refrigerantVishal Talape
for most common and probable questions asked in interviews
like share and subscribe
https://www.youtube.com/watch?v=yyh53wr_XfY
Magnetic refrigeration, or adiabatic demagnetization, is a cooling technology based on the magneto caloric effect, an intrinsic property of magnetic solids.
A strong magnetic field is applied to the refrigerant, forcing its various magnetic dipoles to align and putting these degrees of freedom of the refrigerant into a state of lowered entropy.
What Is Magnetic refrigeration
he magnetocaloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a temperature change of a suitable material is caused by exposing the material to a changing magnetic field. This is also known by low temperature physicists as adiabatic demagnetization. In that part of the refrigeration process, a decrease in the strength of an externally applied magnetic field allows the magnetic domains of a magnetocaloric material to become disoriented from the magnetic field by the agitating action of the thermal energy (phonons) present in the material. If the material is isolated so that no energy is allowed to (re)migrate into the material during this time, (i.e., an adiabatic process) the temperature drops as the domains absorb the thermal energy to perform their reorientation. The randomization of the domains occurs in a similar fashion to the randomization at the curie temperature of a ferromagnetic material, except that magnetic dipoles overcome a decreasing external magnetic field while energy remains constant, instead of magnetic domains being disrupted from internal ferromagnetism as energy is added.
One of the most notable examples of the magnetocaloric effect is in the chemical element gadolinium and some of its alloys. Gadolinium's temperature increases when it enters certain magnetic fields. When it leaves the magnetic field, the temperature drops. The effect is considerably stronger for the gadolinium alloy (Gd
5Si
2Ge
2).[8] Praseodymium alloyed with nickel (PrNi
5) has such a strong magnetocaloric effect that it has allowed scientists to approach to within one milliKelvin, one thousandth of a degree of absolute zero.[9]
A presentation on detailed study of efficiency of evacuated tube solar water heater under different solar conditons. This includes rate of energy conversion at different time through out the day.
This study was conducted MADAN MOHAN MALAVIYA UNIVERSITY OF TECHNOLOGY under the guidance of Dr. S. C. Jayswal
Presentation on Heat pump and its Function.Monjur Ayon
The discussion are also include about heat pump with its different function,type of heat pump,working procedure,application of heat pump,main component of heat pump.
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it provides the overview about compresses air energy storage with a method used to store electrical energy when it is surplus and release energy back to the system during peak demand.
It is a technolgy by which we can produce cooling Effect Using MAgnets and Magnetic Materials......
For any other enquiry u can contact me on +919540278218....
and can join my Page www.facebook.com/engineeringindia
What Is Magnetic refrigeration
he magnetocaloric effect (MCE, from magnet and calorie) is a magneto-thermodynamic phenomenon in which a temperature change of a suitable material is caused by exposing the material to a changing magnetic field. This is also known by low temperature physicists as adiabatic demagnetization. In that part of the refrigeration process, a decrease in the strength of an externally applied magnetic field allows the magnetic domains of a magnetocaloric material to become disoriented from the magnetic field by the agitating action of the thermal energy (phonons) present in the material. If the material is isolated so that no energy is allowed to (re)migrate into the material during this time, (i.e., an adiabatic process) the temperature drops as the domains absorb the thermal energy to perform their reorientation. The randomization of the domains occurs in a similar fashion to the randomization at the curie temperature of a ferromagnetic material, except that magnetic dipoles overcome a decreasing external magnetic field while energy remains constant, instead of magnetic domains being disrupted from internal ferromagnetism as energy is added.
One of the most notable examples of the magnetocaloric effect is in the chemical element gadolinium and some of its alloys. Gadolinium's temperature increases when it enters certain magnetic fields. When it leaves the magnetic field, the temperature drops. The effect is considerably stronger for the gadolinium alloy (Gd
5Si
2Ge
2).[8] Praseodymium alloyed with nickel (PrNi
5) has such a strong magnetocaloric effect that it has allowed scientists to approach to within one milliKelvin, one thousandth of a degree of absolute zero.[9]
A presentation on detailed study of efficiency of evacuated tube solar water heater under different solar conditons. This includes rate of energy conversion at different time through out the day.
This study was conducted MADAN MOHAN MALAVIYA UNIVERSITY OF TECHNOLOGY under the guidance of Dr. S. C. Jayswal
Presentation on Heat pump and its Function.Monjur Ayon
The discussion are also include about heat pump with its different function,type of heat pump,working procedure,application of heat pump,main component of heat pump.
Compressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAESCompressed Air Energy Storage CAES
it provides the overview about compresses air energy storage with a method used to store electrical energy when it is surplus and release energy back to the system during peak demand.
It is a technolgy by which we can produce cooling Effect Using MAgnets and Magnetic Materials......
For any other enquiry u can contact me on +919540278218....
and can join my Page www.facebook.com/engineeringindia
This revision presentation introduces the concept of business ethics. The distinction between ethical and legal behaviour is examined as are the potential benefits and drawbacks of ethical behaviour. Some topical examples of business ethics in action are also provided.
The magnetic refrigeration at room temperature is an emerging technology that has
attracted the interest of researchers around the world (Bouchekara, 2008). Such a technology
applies the magnetocaloric effect which was first discovered by Warburg (Bohigas, 2000;
Zimm, 2007).
Magnetic refrigeration is a technology that has proven to
be environmentally safe. Computer models have shown
25% efficiency improvement over vapor compression
systems.
Magnetic refrigeration has been viewed as primarily a cryogenic technology because the necessary high magnetic fields are most easily provided by superconducting magnets.
Review of magnetic refrigeration system as alternative to conventional refrig...Naji Abdullah
The refrigeration system is one of the most important systems in industry.
Developers are constantly seeking for how to avoid the damage to the environment. Magnetic
refrigeration is an emerging, environment-friendly technology based on a magnetic solid that
acts as a refrigerant by magneto-caloric effect (MCE). In the case of ferromagnetic materials,
MCE warms as the magnetic moments of the atom are aligned by the application of a magnetic
field. There are two types of magnetic phase changes that may occur at the Curie point: first
order magnetic transition (FOMT) and second order magnetic transition (SOMT). The
reference cycle for magnetic refrigeration is AMR (Active Magnetic Regenerative cycle),
where the magnetic material matrix works both as a refrigerating medium and as a heat
regenerating medium, while the fluid flowing in the porous matrix works as a heat transfer
medium. Regeneration can be accomplished by blowing a heat transfer fluid in a reciprocating
fashion through the regenerator made of magnetocaloric material that is alternately magnetized
and demagnetized. Many magnetic refrigeration prototypes with different designs and software
models have been built in different parts of the world. In this paper, the authors try to shed
light on the magnetic refrigeration and show its effectiveness compared with conventional
refrigeration methods.
DESIGN AND TESTING OF PROTOTYPE MAGNETIC REFRIGERATION Muhammad Usman
Magnetic refrigeration is considered as a more reliable and sustainable source to generate cooling and effect in the working fluid using a hysteresis effect. Magnetically soft material with less hysteresis loop area has been recommended for this project.
Cryogenic Treatment and Cryogenic Cooling in Die Sink Electric Discharge Mach...IJERA Editor
Integration of Cryogenic Treatment and Cryogenic Cooling with EDM process results in a newer process called as the Cryogenically Assisted Electric Discharge Machining (CEDM) process. It is one of very recent developments for the enhancement of process capabilities of EDM. In this technique, either the tool or the workpiece, or tool and workpiece both, may be, cryogenically treated down to sub zero temperatures or the EDM tool is cryogenically cooled with an objective to modify their properties. The modifications in properties result in the reduction of tool wear rate (TWR) and surface roughness (SR) and to increase material removal rate (MRR). An experimental set up for both the variants of CEDM has been discussed in the presented paper
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Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
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Overview of the fundamental roles in Hydropower generation and the components involved in wider Electrical Engineering.
This paper presents the design and construction of hydroelectric dams from the hydrologist’s survey of the valley before construction, all aspects and involved disciplines, fluid dynamics, structural engineering, generation and mains frequency regulation to the very transmission of power through the network in the United Kingdom.
Author: Robbie Edward Sayers
Collaborators and co editors: Charlie Sims and Connor Healey.
(C) 2024 Robbie E. Sayers
About
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
Technical Specifications
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
Key Features
Indigenized remote control interface card suitable for MAFI system CCR equipment. Compatible for IDM8000 CCR. Backplane mounted serial and TCP/Ethernet communication module for CCR remote access. IDM 8000 CCR remote control on serial and TCP protocol.
• Remote control: Parallel or serial interface
• Compatible with MAFI CCR system
• Copatiable with IDM8000 CCR
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
Application
• Remote control: Parallel or serial interface.
• Compatible with MAFI CCR system.
• Compatible with IDM8000 CCR.
• Compatible with Backplane mount serial communication.
• Compatible with commercial and Defence aviation CCR system.
• Remote control system for accessing CCR and allied system over serial or TCP.
• Indigenized local Support/presence in India.
• Easy in configuration using DIP switches.
CW RADAR, FMCW RADAR, FMCW ALTIMETER, AND THEIR PARAMETERSveerababupersonal22
It consists of cw radar and fmcw radar ,range measurement,if amplifier and fmcw altimeterThe CW radar operates using continuous wave transmission, while the FMCW radar employs frequency-modulated continuous wave technology. Range measurement is a crucial aspect of radar systems, providing information about the distance to a target. The IF amplifier plays a key role in signal processing, amplifying intermediate frequency signals for further analysis. The FMCW altimeter utilizes frequency-modulated continuous wave technology to accurately measure altitude above a reference point.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
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2. To develop more efficient and cost-effective small-scale H2 liquefiers as
an alternative to vapour-compression cycles using Magnetic
refrigeration (adiabatic magnetization)
To understand the Principle and mechanism for generating cooling
effect using the magnet.
3. Magnetic refrigeration is a cooling technology based on the magneto caloric effect.
This technique can be used to attain extremely low temperatures (well below 1
Kelvin), as well as the ranges used in common refrigerators, depending on the design
of the system.
It is a physical process that exploits the magnetic properties of certain solid materials
to produce refrigeration.
The refrigerant is often a paramagnetic salt, such as cerium magnesium nitrate.
It gives cooling nearest to absolute zero than any other method hence it made
liquidification of gases easier.
At the same time it does not emit any CFC or HCFC compounds hence it never
affects our environment specially OZONE layer.
4. Magneto caloric effect was discovered in pure iron in 1881 by E.
Warburg.
DeDebye (1926) & Giauque (1927) proposed a improved technique
of cooling via adiabatic demagnetization independently.
The cooling technology was first demonstrated experimentally in
1933 by chemist Nobel Laureate William F.Giauque & his colleague
Dr.D.P. MacDougall for cryogenic purposes.
In 1997,Prof. Karl A. Gscheidner, Jr. by the lowa State University at
Ames Laboratory demonstrated the first near room temperature
proof of concept magnetic refrigerator.
5. MCE is a magneto-thermodynamic phenomenon in which a reversible
change in temperature of a suitable material is caused by exposing the
material to changing magnetic field.
All magnets bears a property called Currie effect i.e. 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 a versa
at curie temperature as magnet looses energy to the media it regains the
property.
6.
7.
8. • Process is similar to gas
compression and expansion
cycle as used in regular
refrigeration cycle
• Steps of thermodynamic Cycle :->
Adiabatic Magnetization
Isomagnetic Enthalpy Transfer
Adiabatic demagnetization
Isomagnetic Entropic Transfer
9. Substance placed in insulated environment
Magnetic field +H increased
This causes the magnetic dipoles of the atoms to align
The net result is that total Entropy of the item is not reduced and
item heats up (T + ΔTad )
10. Added heat removed by a fluid like water or helium (-Q)
Magnetic Field held constant to prevent the dipoles from
reabsorbing the heat.
After a sufficient cooling Magnetocalric material and coolant are
separated(H=0)
11. Substance returned to another adiabatic(insulated) condition
Entropy remains constant
Magnetic field is decreased
Thermal Energy causes the Magnetic moments to overcome the
field and sample cools(adiabatic temperature change)
Energy transfers from thermal entropy to magnetic entropy(disorder
of the magnetic dipoles)
12. Material is placed in thermal contact with the Environment being
refrigerated.
Magnetic field held constant to prevent material from heating back
up.
Because the working material is cooler than the refrigerated
environment, heat energy migrates into the working material (+Q)
Once the refrigerant and refrigerated environment are in thermal
equilibrium, the cycle continuous.
15. Magnetic Materials
Regenerators
Super Conducting Magnets
Active Magnetic Regenerators
16.
17. MCE is an intrinsic property of a magnetic solid
Ease of application and removal of magnetic effect is most desired
property of material
Alloys of gadolinium produce 3 to 4 K per tesla of change in
magnetic field are used for magnetic refrigeration or power
generation purposes.
ferrimagnets, antiferromagnets and spin glass systems are not
suitable for this application.
Gd5(SixGe1 − x)4, La(FexSi1 − x)13Hx and MnFeP1 − xAsx alloys are some of
the most promising substitutes for Gadolinium and its alloys
18. Magnetic refrigeration requires excellent heat transfer to and from the
solid magnetic material. Efficient heat transfer requires the large surface
areas offered by porous materials. When these porous solids are used in
refrigerators, they are referred to as “Regenerators”
Typical regenerator
geometries include:
• Tubes
• Perforated plates
• Wire screens
• Particle beds
19. Most practical magnetic refrigerators
are based on superconducting
magnets operating at cryogenic
temperatures (i.e., at -269 C or 4 K)
These devices are electromagnets
that conduct electricity with
essentially no resistive losses.
The superconducting wire most
commonly used is made of a
Niobium-Titanium alloy
20. A regenerator that undergoes cyclic heat transfer operations and the
magneto caloric effect is called an Active Magnetic Regenerator.
An AMR should be designed to possess the following attributes:-
High heat transfer rate
High magneto caloric effect
Sufficient structural integrity
Low thermal conduction in the direction of fluid flow
Affordable materials
Ease of manufacture
21. TECHNICAL
• High Efficiency
• Reduced Operating Cost
• Compactness
• Reliability
SOCIO-ECONOMIC
• Competition in Global Market
• Low Capital Cost
• Key Factor to new
technologies
22. At the present stage of the development of magnetic refrigerators with
permanent magnets, hardly any freezing applications are feasible.
Some of the future applications are:-
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 equipments
23. Purchase cost may be high, but running costs are 20% less than the
conventional chillers.
Thus life cycle cost is much less.
Ozone depleting refrigerants are avoided in this system, hence it more
eco-friendly.
Energy conservation and reducing the energy costs are added advantages.
The efficiency of magnetic refrigeration is 60% to 70% as compared to
Carnot cycle.
Magnetic refrigeration is totally maintenance free & mechanically simple
in construction.
24. As every coin has 2 sides, this technique also posses some
drawbacks to be worked on
The initial investment is more as compared with conventional
refrigeration.
The magneto caloric materials are rare earth materials hence their
availability also adds up an disadvantage in MAGNETIC REFRIGERATION.
25. It is a technology that has proven to be environmentally safe. Computer
models have shown 25% efficiency improvement over vapor compression
Systems.
In order to make the magnetic refrigerator commercially Viable, scientists
need to know how to achieve larger temperature swings and also
permanent magnets which can produce strong magnetic fields of order
10 tesla.
There are still some thermal and magnetic hysteresis problems to be
Solved for the materials that exhibit the MCE to become really useful.