Connect the canned bottle with the process tube and then compressorwork for more than 5 minutes.
罐装瓶与快装接头相接，压缩机通电5 分钟以上，注入制冷剂。
2
Result shows that additional compressorwork is needed due to the irreversible entropy productions in the rotary valve thereby decrease the COP of GM type PTC.
结果发现，由于气体在旋转阀中的不可逆损失，使得压缩机功耗增大，降低了GM型脉冲管制冷机的COP。
3
But in a few years a compressor that can work underwater will be needed to supplement the falling pressure in the field.