Connect the canned bottle with the process tube and then compressor work 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。

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Result shows that additional compressor work 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。

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But in a few years a compressor that can work underwater will be needed to supplement the falling pressure in the field.

但是几年之后，一台能够在水下工作的压缩机是必需的，用来补充气田中下降的压力。

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