P2-1079Magnetic refrigeration for hydrogen liquefaction.Key Words: Hydrogen, Magnetic refrigeration, %CarnotMagneticrefrigeratorsutilizingthemagneticthermoelectriceffectcanachievehighercoolingefficiencythanconventionalgascompressionrefrigeratorsbyprinciple,makingasignificantcontributiontoalow-carbonsociety.TheMagneticRefrigerationSystemGroupisdevelopinghighlyefficientrefrigeratorsusingmagneticrefrigeration.We successfully liquefied hydrogen by AMR.The Carnot efficiency of the AMR was found to be 60%.The cooling power of the AMR was about 7.3 W.ConclusionWhat is magnetic refrigeration?Rated operation of the new cryogenic pump.Development of superconducting magnets with low AC losses, essential for large-scale AMR.Rated operation of the large-scale AMR for hydrogen liquefaction.Future plansIntroductionThehydrogenliquefactionefficiencyofconventionaltechnology(gas-typerefrigerators)isaround25%,andachievingevenhigherefficiencyisdifficult.Ontheotherhand,thetheoreticalefficiencyofmagneticrefrigerationexceeds50%.ThisstudymarksthefirstexperimenttosuccessfullyachieveanAMR%Carnotexceeding60%duringhydrogenliquefaction.Theme underDiscussionMagnetic refrigeration system group, GREEN Koji KamiyaE-mail：： kamiya.koji@nims.go.jp00.20.4020406080100GGIG(Fe50%)ErAl2HoAl2Ho0.5Dy0.5Al2DyAl2GdNi2Gd5(Si0.0825Ge0.9175)4ErCo2∆S (J/cm3 K)Temperature (K)B: 0-5 THoAl2Magnetic refrigeration is a cooling method utilizing magnetocaloric effect.700mmActuatorBellowsCryostatCryocoolerActuatorAMR HXAMR HXCryocoolerCryocoolerThermal shieldSuper-conducting coilHEX gas circulation systemUpper AMRRLower AMRRCold stage300 -500 µm HoAl2stamped particles34 mm (inner diameter of AMR)UpperAMRRLowerAMRRcold stageRoom temperature hydrogen gas reservoir tank(15 liter)Hydrogen HEXH2supply lineHelium lineBellowsRHXRHXEfficiency of AMRExperimental set-upIn the entropy-temperature diagram, a relative Carnot efficiency of 60% was achieved.Relative %Carnot =Hydrogen liquefaction by AMRScaling up of AMRLarge-scale AMR2.2 m1 mS/CmagnetNewly developed cryogenic pumpShaftBellowsCaseHEX gas(helium)Helium gas supply line
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