【作者】 甘智华； 程章展； 黄永华； 陈国邦； 邱利民；

【Author】 Gan Zhihua Cheng Zhangzhan Huang Yonghua Chen Guobang Qiu Limin (Cryogenics Lab., Zhejiang University, Hangzhou, 310027)

【机构】 浙江大学制冷与低温研究所；

【摘要】 在前期研究的基础上,对氦氢混合工质二级脉管制冷性能作了进一步的研究工作。就氢组分的体积含量为7．14％、20．08％、34．27％、45％、60％的五组混合工质在制冷性能方面与纯氦作了对比分析。结果表明,在16-40K温区范围,氦氢混合工质无论在制冷量还是在制冷系数COP方面都优于纯氦,并且在氢的三相点温度附近,得到一条外加热负荷可达0．9W左右的近等温制冷功率曲线。实验中还观察到氦氢混合工质在制冷过程中氢组分的气-液、液-固的相变过程。更多还原

【Abstract】 Based on the previously experimental studies, a further experimental investigation on two-component helium and hydrogen mixtures in a two-stage pulse tube refrigerator was carried out. The He-H2 mixtures, with 7.14%, 20.08%, 34.27%, 45% and 60% H2, were compared to the pure helium in refrigerating performance. The experimental results show, when the temperature of second stage pulse tube between 16K and 40K, both the coefficient performance(COP) and refrigeration power with He-H2 mixtures are better than with pure helium. During the cooling process of PTR with the mixtures, the phenomena of hydrogenous vapor-liquid and liquid-solid phase transforms can be observed. And around the triple phase point of hydrogen(13.947K), a nearly stable temperature platform with 0.9W heat loads could be achieved.更多还原