Modelling, Optimization, and Experimental Studies of Refrigeration CO 2 Ejectors: A Review

Lixing Zheng, Yiyan Zhang, Lifen Hao, Haojie Lian (), Jianqiang Deng and Wei Lu
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Lixing Zheng: School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
Yiyan Zhang: School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
Lifen Hao: School of Electric Power, Civil Engineering and Architecture, Shanxi University, Taiyuan 030006, China
Haojie Lian: Key Laboratory of In-Situ Property-Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, China
Jianqiang Deng: School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 710049, China
Wei Lu: School of Mechanical Engineering, Guangxi University, Nanning 530004, China

Mathematics, 2022, vol. 10, issue 22, 1-23

Abstract: CO 2 is regarded as an effective and environmentally friendly refrigerant. Using a CO 2 ejector is a proven method for enhancing the effectiveness of a transcritical CO 2 refrigerant system. However, the complex internal flow of a CO 2 ejector, involving supersonic effects, phase change effects, metastable effects, and so on, makes it difficult to understand. In order to summarize the current state of the technology and knowledge gaps, this work provides a comprehensive literature review on CO 2 ejectors. In the first part, mathematical modelling and simulation calculations of CO 2 ejectors are presented, and an overview and classification of ejector models are given. In the second part, the structural optimization part of the ejector is described in detail, and the nozzle structure, the mixing chamber length, improvements to multi-jet systems, and the impact of these factors on the system performance are analyzed. In the third part, flow visualization is used to study the complex flow phenomenon, and the effect of the shock wave on the entrained rate of the ejector is discussed. Finally, the paper outlines the relationship between all ejector technologies, working fluids, and ejector performance and makes valid recommendations for further research and development of CO 2 ejectors.

Keywords: CO 2 ejector; mathematical model; structural optimization; shock wave; visualization experiment (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2022
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