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对有不良气体存在下系统的制冷热力学循环进行了分析，建立了不良气体存在时，系统循环ＣＯＰ的计算模型，利用所建ＣＯＰ模型对系统的长期性能变化进行了分析并对系统寿命进行了评估，在此基础上提出了解决系统长期性能下降问题的简便而有效的途径．
The thermodynamic cycle of cooling system in the presence of unfriendly gas is analyzed. The calculation model of system cyclic COP in the presence of undesirable gases is established. The long-term performance changes of the system are analyzed and the system life is evaluated , On this basis, put forward a simple and effective way to solve the problem of long-term system performance degradation.