| 摘要: |
| 多联引射器是提高跨临界CO2制冷系统运行和调控性能的有效设备之一，本文提出了跨临界CO2多联引射器制冷系统的动态模型：利用有限体积法建立气冷器与低温蒸发器模型；利用集总参数法建立满液式蒸发器模型；根据质量和能量守恒建立气液分离器与储液器模型；并基于真实CO2物性，考虑内部跨音速流动、相变和壅塞等现象建立了两相引射器模型，单引射器模型预测结果与文献实验数据误差在10%内。分别以压缩机转速和多联引射器的调节作为扰动条件研究了系统的瞬态响应，结果表明所建立的动态模型与实验数据具有相同的响应规律，本研究为多喷射器制冷系统性能及调控规律的研究提供了高精度的模拟条件。 |
| 关键词: 制冷系统 多联引射器 系统动态模型 跨临界 |
| DOI： |
| Received:September 24, 2022Revised:December 05, 2022 |
| 基金项目:科技部重点研发计划（2021YFF0306802） |
|
| Development of Dynamic Model of Transcritical CO2 Multi-ejector Refrigeration System |
|
Xiong Zhikang, He Yang, Deng Jianqiang
|
| (School of Chemical Engineering and Technology, Xi'an Jiaotong University) |
| Abstract: |
| Multi-ejector is an effective device for improving the operation and regulation of transcritical carbon dioxide (CO2) refrigeration systems. This paper presents a dynamic model of a transcritical CO2 refrigeration system. The air cooler and low-temperature evaporator models are established using the finite volume method and the flooded evaporator model is established by lumped parameter method. A gas-liquid separator and accumulator model is established according to the conservation of mass and energy. A two-phase ejector model is established based on the physical properties of CO2, considering the phenomena of internal transonic flow, phase change, and congestion. The model predictions had an error within 10% compared with experimental data reported in the literature. The transient response of the system was studied by adjusting the multi-ejector and speeds of the compressor as disturbance conditions. The results show that the developed dynamic model has characteristics similar to that of the experimental data, which provides high-precision simulation conditions for studying the performance and regulation features of a multi-ejector refrigeration system. |
| Key words: refrigeration system multi-ejector system dynamic model transcritical CO2 |
