过冷态超流氦恒温器的热力学分析  

Thermodynamic analysis of subcooled superfluid helium cryostat

作　　者：朱志刚[1,2] 庄明[1] 刘华军[1] 郝强旺[1,2] 

机构地区：[1]中国科学院等离子体物理研究所,合肥230031 [2]中国科学院大学,北京100049

出　　处：《低温工程》2013年第3期15-17,共3页Cryogenics

基　　金：国家磁约束核聚变能研究专项基金(2011GB112004)

摘　　要：对过冷态超流氦恒温器的热力学过程进行分析,考察了不同的设计温度和J-T换热器热效率下恒温器的制冷性能,得到了理论制冷量的变化曲线。结果表明,理论制冷量与设计温度和J-T换热器的热效率密切相关。计算发现,160 L液氦在2 W制冷量下从4.2 K降至1.8 K大约需要24 h。Thermodynamic analysis of subcooled superfluid helium cryostat was carried out.The influence of different design temperature and different efficiency of J-T heat exchanger on theoretical cooling capacity was analyzed,and theoretical cooling capacity variation curves were also presented.The results show that theoretical cooling capacity is greatly related to design temperature and efficiency of J-T heat exchanger.It will take about 24 h to cool 160 L liquid helium from 4.2 K down to 1.8 K with 2 W cooling capacity.

关 键 词：超流氦 低温恒温器 热力学分析 

分 类 号：O514[理学—低温物理] TB657[理学—物理]