The simulation results shows that the opening variety of compressor by-pass valve affects cooling-downtime 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。
2
By applying coolingdown method of adding factory air into the HP system, shortens urea converter coolingdowntime 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。
3
A group of experiments show that the increasing of hot end length will increase coolingdowntime, cold tip temperature and hot end temperature evidently, but pressure ratio will decreases.