单机双级机制冷系统加氨困难的分析雷霞（联大建材轻工学院１０００３６）加氨是大、中型冷藏库日常运行管理中较重要的一项工作。在只设置单机双级制冷机的低温库往往存在加氨困难的现象。当加氨钢瓶内的压力接近中间压力时，钢瓶内仍有大量氨液，加氨工作却无法继续。如... Single-machine two-stage refrigeration system plus ammonia difficulties Lei Xia (ULS 100036) plus ammonia is a large, medium-sized refrigerator daily operation and management of an important task. It is often difficult to add ammonia in a low-temperature bank where only a single-stage two-stage refrigerator is provided. When the ammonia cylinder pressure is close to the middle pressure, the cylinder is still a lot of ammonia, ammonia work can not continue. Such as...