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17-02-2010, 03:14 PM
Post: #1
magnetic refrigeration full report

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SYNOPSIS


Magnetic refrigeration is an alternate method of producing refrigeration. This finds great importance now a day because of the world wide ban of environmental damaging substance like chloroflurocarbon, which is used in conventional vapor compression refrigeration. Magnetic refrigeration is based on phenomenon called magneto caloric effect. A quick review of the different stages of development made in magnetic refrigeration is done in this paper. And a proto type of magnetic refrigerator that works at room temperature is discussed .the magnetic material is cyclically magnetized and demagnetized by permanent magnets in an adiabatic process. Even water can be used as a heat exchanger and no use harmful gases. The maintenance required for magnetic refrigerator is very small compared to vapor compression refrigeration the different methods of finding magnetocaloriceffect are discussed. Different types of magnetic refrigerants that are commonly used and some of their important features are discussed.

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21-02-2010, 05:54 AM
Post: #2
RE: magnetic refrigeration full report
hi there..
can u provide complete details abt this topic for me pls...

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24-03-2010, 12:54 PM
Post: #3
RE: magnetic refrigeration full report
Magnetic refrigeration is an alternate method of producing refrigeration. This finds great importance now a day because of the world wide ban of environmental damaging substance like chloroflurocarbon, which is used in conventional vapor compression refrigeration. Magnetic refrigeration is based on phenomenon called magneto caloric effect. A quick review of the different stages of development made in magnetic refrigeration is done in this paper. And a proto type of magnetic refrigerator that works at room temperature is discussed .the magnetic material is cyclically magnetized and demagnetized by permanent magnets in an adiabatic process. Even water can be used as a heat exchanger and no use harmful gases. The maintenance required for magnetic refrigerator is very small compared to vapor compression refrigeration the different methods of finding magnetocaloriceffect are discussed. Different types of magnetic refrigerants that are commonly used and some of their important features are discussed.

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01-04-2010, 12:25 PM
Post: #4
RE: magnetic refrigeration full report
Magnetic refrigeration technology could provide a Ëœgreenâ„¢ alternative to traditional energy-guzzling gas-compression fridges and air conditioners.They would require 20-30 percent less energy to run than the best systems currently available, and would not rely on ozone-depleting chemicals or greenhouse gases. magnetic refrigeration system works by applying a magnetic field to a magnetic material - some of the most promising being metallic alloys - causing it to heat up.This excess heat is removed from the system by water, cooling the material back down to its original temperature.When the magnetic field is removed the material cools down even further, The primary reson for magnetic refrigeration is the magnetocaloric effect (MCE), discovered by Warburg in 1881. Specifically, the MCE is "the response of a magnetic solid to a changing magnetic field which is evident as a change in its temperature" (Gschneidner)2. When a magnetic field is applied to a magnetic material, the unpaired spins partially comprising the materialâ„¢s magnetic moment are aligned parallel to the magnetic field. This spin ordering lowers the entropy of the system since disorder has decreased. To compensate for the aligned spins, the atoms of the material begin to vibrate, perhaps in an attempt to randomize the spins and lower the entropy of the system again. In doing so, the temperature of the material increases. Conversely, outside the presence of a file, the spins can return to their more chaotic, higher entropy states, and one then observes a decrease in the materialâ„¢s temperature. The warming and cooling process can be likened to a standard refrigerator which implements compressing and expanding gases for variations in heat exchange and surrounding temperature.


read more
http://ocw.mit.edu/NR/rdonlyres/Material..._paper.pdf
http://ipnpr.jpl.nasa.gov/progress_report/42-78/78D.PDF
http://en.wikipedia.org/wiki/Magnetic_refrigeration
http://www.chuden.co.jp/english/corporat...107_1.html
http://www.ashrae.org/doclib/20070727_Emerging.pdf

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13-07-2010, 10:17 PM
Post: #5
RE: magnetic refrigeration full report
I need full report on magnetic refrigeration

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