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Investigation of the starting modes of the low-temperature refrigerating machines working on the mixtures of refrigerants

机译：研究制冷剂混合物的低温制冷机的启动方式

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摘要

The starting mode of a small low-temperature Joule-Thomson refrigerating machine is in focus of the experimental investigation reported here. The refrigerating machine operates by the Linde cycle. A mixture of hydrocarbons - isobutane/ethane/methane - is used as a refrigerant. The object of cooling is a small testing chamber to be cooled down and thermostabilized at the temperature level of (-70, ..., -80)℃. The starting modes were studied under heavy-duty heat load on the system resulting from the initial thermal equilibrium between the whole system and ambience. The experimental data demonstrate a crucial effect of the low-boiling mixture components condensation in the refrigerant high-pressure flow on the machine starting performance. Excessive values of the discharge pressure, compression ratio and compressor input power have been observed during the start-up process which may last for tens of minutes affecting the refrigerating machine reliability. Some probable causes of the phenomena and countermeasures are pointed out.
机译：小型低温焦耳-汤姆森制冷机的启动方式是此处报道的实验研究的重点。制冷机按林德循环运行。碳氢化合物（异丁烷/乙烷/甲烷）的混合物用作制冷剂。冷却的目的是在（-70，...，-80）℃的温度水平下将其冷却并热稳定的小型测试室。在整个系统和环境之间的初始热平衡所导致的系统的高负荷热负荷下研究了启动模式。实验数据表明，制冷剂高压流中低沸点混合物成分的凝结对机器的启动性能具有至关重要的影响。在启动过程中，观察到排气压力，压缩比和压缩机输入功率过大，可能持续数十分钟，从而影响制冷机的可靠性。指出了该现象的可能原因和对策。

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