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Abstract Magnetic refrigeration utilizes the magnetocaloric effect of a magnetic material, whose temperature changes according to the change of magnetic field strength. It is regarded as an eco-friendly refrigeration technology in that it uses magnetic materials as refrigerants instead of CFC, HCFC, and HFC refrigerants used in vapor compression refrigeration. It is also regarded as an energy-efficient refrigeration technology in that it does not use noisy and power-consuming compressors. This paper presents thermodynamic analysis on a magnetic refrigeration system using experimental results obtained from a magnetic refrigeration apparatus. The magnetic refrigeration apparatus was built using two sets of concentric Halbach cylinders consisting of permanent magnet segments. Specifically the coefficient of performance (COP) of the magnetic refrigeration system was calculated using the energy removed from the working fluid across an AMR bed and the work input to run electric motors.

Magnetic refrigeration utilizes the magnetocaloric effect of a magnetic material, whose temperature changes according to the change of magnetic field strength. It is regarded as an eco-friendly refrigeration technology in that it uses magnetic materials as refrigerants instead of CFC, HCFC, and HFC refrigerants used in vapor compression refrigeration. It is also regarded as an energy-efficient refrigeration technology in that it does not use noisy and power-consuming compressors. This paper presents thermodynamic analysis on a magnetic refrigeration system using experimental results obtained from a magnetic refrigeration apparatus. The magnetic refrigeration apparatus was built using two sets of concentric Halbach cylinders consisting of permanent magnet segments. Specifically the coefficient of performance (COP) of the magnetic refrigeration system was calculated using the energy removed from the working fluid across an AMR bed and the work input to run electric motors. [ABSTRACT FROM AUTHOR]

Magnetic refrigeration, which utilizes the magnetocaloric effect of the magnetic material, is a promising alternative refrigeration technology. It is an eco-friendly refrigeration technology using solid refrigerants instead of CFC/HCFC or HFC refrigerants. Also it is regarded as an energy-efficient refrigeration system to generate temperature difference between high- and low-temparature sides using the temperature change of magnetic refrigerants according to the change of magnetic field, without using power-consuming and noisy compressors. This paper presents some experimental results obtained from a piston-driven type magnetic refrigeration apparatus, which has two sets of concentric Halbach cylinder permanent magnets. Experimental results, which were obtained by varying the stroke and speed of the piston that is used to circulate the heat transfer fluid through AMR beds of the magnetic refrigeration apparatus, were discussed. [ABSTRACT FROM AUTHOR]