小型室温磁制冷系统的研制  

Design and performance of a compact room-temperature magnetic refrigerator

作　　者：李振兴[1,2] 李珂[1] 沈俊[1,2] 戴巍[1,2] 贾际琛 郭小惠[1,2] 高新强[1] 公茂琼[1,2] 

机构地区：[1]中国科学院理化技术研究所中国科学院低温工程学重点实验室,北京100190 [2]中国科学院大学,北京100049

出　　处：《低温工程》2017年第1期13-16,20,共5页Cryogenics

基　　金：国家自然科学基金(No.51322605;No.51271192)项目资助

摘　　要：设计并搭建了一台小型室温磁制冷系统,进行了初步性能实验研究。系统采用双层同轴Halbach永磁组,磁体旋转后可在中心处获得最大1.3 T磁场;在主动磁回热器两端设计了双通道流路,可有效避免系统流体死体积;驱动控制系统利用多轴伺服驱动器对磁体和水力活塞运动进行控制。样机采用了直径0.55—0.80 mm钆球作为制冷工质、p H值为11的氢氧化钠溶液为换热流体,进行了初步实验研究,考察了利用系数对制冷温跨的影响等。在高低温端绝热与运行频率0.60 Hz的情况下,实验获得13.3 K的最大无负荷制冷温跨;在运行频率为0.4 Hz时最佳利用系数为0.35,此时无负荷制冷温跨为12.1 K。Magnetic refrigeration shows great characteristic for refrigeration applications due to its merits of environmental friendliness,potential high efficiency, low noise and low vibration. A compact room-tem- perature magnetic refrigerator is established with rotating Halbaehpermanent magnetgroup and duo-flow channel design, and system performance have been preliminarily tested. The motion of rotating magnet and hydraulic piston are controlled by Multi-axis servo drivers. With 0.55-0.80 mm gadolinium spheres as mag- netic material,pH value 11 NaOH solution as the heat transfer fluid and 1.3 T maximu mmagnetie field, maximum no-load temperature span is 13.3 K at 0.6 Hz operation frequency. When it operates at 0.40 Hz frequency,the optimum utilization factor is 0.35. And maximum no-load temperature span is 12.1 K.

关 键 词：室温磁制冷机 磁热效应 制冷温跨 利用系数 

分 类 号：TB65[一般工业技术—制冷工程]