The simulation results shows that the opening variety of compressor by-pass valve affects cooling-down time of refrigerator system directly.

结果表明，降温过程中压缩机旁通阀的开度变化直接影响系统的降温时间。

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By applying cooling down method of adding factory air into the HP system, shortens urea converter cooling down time to a large scale and decreases shutdown losses for enterprise.

通过采用向尿素合成塔加入工厂空气的降温方法，与传统方法相比大幅度缩短降温时间，为企业减少停工损失。

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A group of experiments show that the increasing of hot end length will increase cooling down time, cold tip temperature and hot end temperature evidently, but pressure ratio will decreases.

通过一组实验研究了脉冲管热端长度对性能的影响，包括脉冲管热端温度、冷端温度、降温时间、压比。

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