两级预冷J-T制冷机的数值建模与分析  

Numerical model and analysis of a two-stage precooled Joule-Thomson cooler

作　　者：陶轩[1,2] 甘智华[1,2] 刘东立[1,2] 俞涵如 

机构地区：[1]浙江大学制冷与低温研究所,杭州310027 [2]浙江省制冷与低温重点实验室,杭州310027

出　　处：《低温工程》2015年第4期8-12,26,共6页Cryogenics

基　　金：国家自然科学基金(51176165);高等学校博士学科点专项科研基金(20130101110098)

摘　　要：针对SPICA太空望远镜采用的两级斯特林制冷机预冷J-T循环获得4 K级冷量而建立了Sage模型,并用文献中的实验数据验证,基于此模型分析高压压力PH与末级预冷温度Tpre[2]对系统性能的影响。从耗功的角度来看,降低Tpre[2]和适当升高PH有利于增大J-T级的制冷量,但Tpre[2]的降低使预冷斯特林制冷机耗功增大;而PH的增高不仅使J-T压缩机耗功增大,而且实现困难,制冷系统的优化要选择合适的Tpre[2]和PH以使总耗功最小。此外,对循环进行了分析。A sage model was set based on the Joule-Thomson cycle, which was utilized to precool SPI- CA space telescope by two-stage Stirling cooler to obtain cooling capacity in 4K stage. The Sage model was verified by experiment data. It was analyzed that high pressure P. and precooling temperature in the last stage Tpro[2] affects system performance. In the view of power consumption, decreasing Tpre[2] and increasing P_H in a certain degree improves cooling capacity of J-T stage, but decreasing Tpro[2] increases power con- sumption of Stirling cooler. Increasing P_H increases power consumption of J-T compressor and it is difficult to realize. The optimization of system is the choice of Tpre[2] and P_H to minimize overall power consumption. Besides, exergy analysis was carried out.

关 键 词：液氦温区 J-T制冷机斯特林制冷机Sage 太空望远镜 

分 类 号：TB651[一般工业技术—制冷工程]