混合工质脉管制冷的热力学性能预测  

THERMODYNAMIC PERFORMANCE PREDICTION OF PULSE TUBE REFRIGERATION WITH MIXTURE FLUIDS

作　　者：陈国邦[1] 甘智华[1] G.Thummes C.Heiden 余建平[1] 

机构地区：[1]浙江大学制冷与低温工程研究所,杭州310027 [2]德国吉森大学应用物理研究所

出　　处：《低温工程》2000年第4期1-6,共6页Cryogenics

基　　金：国家自然科学基金;德国国际学术交流中心DAAD资助

摘　　要：提出了用于预测混合工质脉管制冷热力学性能的改进型Brayton制冷循环 ,建立了制冷系统制冷量和制冷系数COP的理论表达式。在对多种低温流体的预测计算的基础上 ,提出了具有应用潜力的混合工质对。计算结果表明 ,如果用10 %氮与 90 %氦的混合工质对代替纯氦 ,脉管制冷机在 80K温度下的制冷系数和制冷量分别可以提高 9 5%和 6 7%。此外还讨论了其它可能用于 80K温区脉管制冷的混合工质对 ,如氢 氦、氩 氦、氖 氦混合物等。A refrigeration cycle with two isentropic and two isobaric processes referred to the modified Brayton cycle is introduced for predicting the thermodynamic performance of pulse tube refrigeration with a binary mixture refrigerant.The corresponding theoretical expressions of cooling power,thermodynamic efficiency and required work of a refrigeration cycle are established.Based on the prediction calculation of a number of cryogenic fluids,the promising mixture pairs of working refrigerants are recommended.The results computed show that 9 5% of coefficient of performance( COP )AND 6 7% of cooling power at 80 K could be gained,if a mixture pair of 10% nitrogen and 90% helium is used instead of pure helium for the pulse tube refrigeration.The minor pairs of mixture,which have positive effect for pulse tube refrigeration at temperature near 80 K including hydrogen helium,argon helium,and neon helium,are also discussed.

关 键 词：脉管制冷 混合工质 布雷顿循环 脉管制冷机 热力学性能预测 

分 类 号：TB651[一般工业技术—制冷工程] TB61