超流氦制冷系统2K冷却级热力分析  

Thermal analyses on the 2K cooling stage for superfluid helium refrigerator system

作　　者：杜宏鹏[1] 王莉[1] 杨光达[1] 

机构地区：[1]哈尔滨工业大学低温与超导技术研究所,哈尔滨150001

出　　处：《低温与超导》2006年第4期271-275,共5页Cryogenics and Superconductivity

摘　　要：通过对节流阀阀前J-T换热器的效率以及2 K冷却级的制冷量等参量与节流阀前温度、压力以及J-T换热器冷、热端温差等关系的分析表明,考虑比热变化时J-T换热器的效率均低于不考虑比热变化时的J-T换热器的效率,且发现在降低换热器入口温度来提高单位质量氦气的2 K制冷量时,J-T换热器的热效率将降低。分析结果表明为避免系统变工况运行时换热器运行出现负温差,建议J-T换热器应该以限定冷端温差进行设计。In this paper, the relations cooling capacity at 2K and J-T heat exchanger efficiency with the temperature and pressure before the J-T valve and the temperature difference at the hot and cold ends of J-T heat exchanger have analyzed. The efficiency of the J-T heat exchanger considering variable specific heat of heliura is lower than that at constant heat specific, and it decreases with decreasing of the inlet temperature of the J-T heat exchanger. In order to avoid the negative temperature difference in the J-T heat exchanger at various opening conditions, the paper suggests the design of heat exchanger may be developed at limited temperature difference at the cold end.

关 键 词：超流氦冷却系统 效率J—T换热器 2K冷却级 制冷量 温差 

分 类 号：TB651[一般工业技术—制冷工程] TQ116.27[化学工程—无机化工]