制冷学报2025，Vol.46Issue(2)：59-66,8.DOI:10.12465/j.issn.0253-4339.2025.02.059
氦节流制冷机耦合大热容负载快速降温特性
Rapid Cooling Characteristics of Load with Large Heat Capacity in Joule-Thomson Refrigerator Using Helium
摘要
Abstract
Helium throttling refrigeration technology is a key cooling method used in liquid helium temperature zones in space.Research on the rapid cooling of chillers coupled with large heat capacity loads is important for the efficient operation of large heat capacity loads.To clarify the cooling characteristics of helium throttling chillers under different rapid cooling schemes,cooling experiments with no additional measures scheme,room-temperature valve bypass scheme,and thermal switch scheme were conducted based on GM pre-cooled helium Joule-Thomson chillers under different heat capacity loads.The experimental results show that the load-free pull-down times of the three schemes were 39.8 h,20.5 h,and 19 h,respectively.Based on thermodynamics and heat transfer theories,the changes in the radiation,convection,heat conduction,and throttling source terms during no-load cooling were quantitatively analyzed,and the reasons for the difference in cooling time of helium throttling chillers under different schemes were explained.With a simulated load of 0.136 kg of copper,schemes of the room-temperature valve bypass and hot switch were adopted,and the corresponding cooling times were 25.5 h and 20 h,respectively.The experimental results show that the cooling effects of the thermal switch and room-temperature valve bypass scheme are essentially the same for the cooling of a small heat capacity load.Therefore,thermal switch cooling has significant advantages for large-heat-capacity load cooling.关键词
氦节流制冷机/快速降温/大热容负载/热开关/旁通Key words
helium Joule-Thomson refrigerator/rapid cooling/large heat capacity/heat switch/bypass引用本文复制引用
江天舒,陈志超,刘少帅,卢李昊,蒋珍华,吴亦农..氦节流制冷机耦合大热容负载快速降温特性[J].制冷学报,2025,46(2):59-66,8.基金项目
国家自然科学基金(51806231)资助项目.(The project was supported by the National Natural Science Foundation of China(No.51806231).) （51806231）
