State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, 221116, China.
Department of Energy Sciences, Faculty of Engineering, Lund University, 22100, Lund, Sweden.
Environ Sci Pollut Res Int. 2023 Sep;30(43):97339-97352. doi: 10.1007/s11356-023-29240-y. Epub 2023 Aug 17.
Ultralow-temperature refrigeration faces significant issues linked to the security of the cold chain for the production, storage, transportation, and distribution of COVID-19 vaccines. The use of environmentally friendly refrigerants in cascade refrigeration systems (CRS) to provide low-temperature range is motivated by the high demand for ultralow-temperature refrigeration units. In the current study, a CRS is built to generate a low temperature of -86 °C for the storage of COVID-19 vaccines. In the CRS, the natural refrigerant combination R290-R170 is used as high-temperature and low-temperature fluids. The pull-down performance of the -86 °C freezer is explored experimentally, and the stable operating performance is determined at two different dry bulb and wet bulb temperatures. Various status monitors are set up to analyze the CRS's operation features, and several temperature monitors are put in the freezer to analyze temperature variations. The power consumption of the CRS is examined and evaluated. Finally, several key findings are summarized. The current work is the first to involve experimental measurements on -86 °C temperature generated by a CRS, which can substantially enhance experiment data in ultralow-temperature refrigeration and contribute to a more in-depth understanding of the operation performance of a -86 °C ultralow-temperature freezer.
超低温制冷面临着与新冠疫苗生产、储存、运输和分发冷链安全相关的重大问题。在需要超低温制冷设备的情况下，采用环保型制冷剂的复叠式制冷系统（CRS）来提供低温范围。本研究构建了一个 CRS，以实现 -86°C 的低温来储存新冠疫苗。在 CRS 中，天然制冷剂组合 R290-R170 被用作高温和低温流体。通过实验探索了 -86°C 冷冻箱的下拉性能，并在两个不同的干球和湿球温度下确定了稳定的运行性能。设置了各种状态监测器来分析 CRS 的运行特性，并在冷冻箱中放置了多个温度监测器来分析温度变化。检查并评估了 CRS 的功耗。最后，总结了几个关键发现。本工作首次涉及 CRS 产生的-86°C 温度的实验测量，这可以大大增强超低温制冷方面的实验数据，并有助于更深入地了解-86°C 超低温冷冻箱的运行性能。
