【摘要】 对低温系统的预冷过程做了分析，研讨了各种因素对预冷过程的影响。介绍了预冷耗液量计算公式的推导，给出了ＬＨｅ、ＬＨ２、ＬＮ２和ＬＯ２预冷比耗液量计算图。利用计算图可以方便地计算预冷耗液量。更多还原

【Abstract】 The precooling process of a cryogenic system and the factors that influence precooling process are discussed. Formulas for precooling liquid requirement are represented.The graphs for calculating cooldown liquid requirement are given.The precooling liquid requirement can be easily determined by means of these graphs.更多还原