自复叠制冷系统压力和组分调节

发布时间：2019-04-25 19:58

【摘要】：热气旁通调节可有效排除高压对自复叠制冷系统的危害,但对混合工质的组分没有调节作用。针对三级自复叠制冷系统冷凝压力和排气温度较高的特点,提出了带两路旁通的4种压力和组分调控方式。热气旁通调节时冷凝压力周期性波动变化较大,电磁阀开启较频繁,系统开机70 min后才能达到稳定状态。二级相分离器气相出口旁通调节时冷量损失较严重,低温工质的冷量通过旁通管路排放到膨胀容器。一级相分离器气相出口调节和两个相分离器气相出口同时调节时制冷系统的性能很接近,系统开机30 min后即可达到稳定运行状态。通过对压缩机和蒸发器运行工况检测,一级相分离器气相出口调节和两个相分离器气相出口同时调节为较好的自动复叠制冷系统压力和组分调控方式。
[Abstract]:The by-pass regulation of hot gas can effectively eliminate the harm of high pressure to the self-cascade refrigeration system, but it has no effect on the composition of mixed refrigerant. In view of the high condensing pressure and exhaust temperature of the three-stage self-cascade refrigeration system, four kinds of pressure and component regulation modes with two-way bypass are proposed. During the hot gas bypass regulation, the condensing pressure fluctuates greatly, the solenoid valve is opened more frequently, and the system can reach the stable state only after the system is turned on for 70 min. The cooling loss is serious when the gas phase outlet of the two-stage separator is controlled by-pass, and the cooling amount of the low temperature working fluid is discharged to the expansion vessel through the bypass pipe. The performance of the refrigeration system is very close when the gas phase outlet of the first stage separator and the gas phase outlet of the two phase separators are adjusted at the same time. After the system is turned on for 30 min, the refrigeration system can reach a stable operation state. By testing the working conditions of compressor and evaporator, the gas phase outlet control of the first stage separator and the gas phase outlet of the two phase separators are adjusted simultaneously as a better automatic cascade refrigeration system pressure and component control mode.
【作者单位】：河南科技大学车辆与交通工程学院;上海理工大学制冷技术研究所;
【基金】：国家自然科学基金项目(51176124) 河南省重点攻关项目(152102210279) 河南省高等学校重点科研项目(15A470001) 河南科技大学青年科学基金项目(2015QN014)~~
【分类号】：TB657

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