Investigation of the ejector application in the cryogenic Joule-Thomson refrigeration system. (15th December 2018)

• Record Type: Journal Article
• Authors: Lee, Jisung; Baek, Seungwhan; Jeong, Sangkwon
• Is Part Of: Energy. Volume 165(2018)Part B
• Page Start: 269
• Page End: 280
• Publication Date: 2018-12-15
• Subjects: Ejector -- Joule-Thomson refrigeration -- Cryogenic -- Mixed refrigerant -- Efficiency; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2018.09.146
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: We investigate the application of ejector in the cryogenic refrigeration system. A new refrigeration cycle is proposed using ejector technology to enhance the thermodynamic efficiency of Joule-Thomson (JT) refrigeration system. The ejector combined with the JT refrigeration cycle works with nitrogen and neon mixed refrigerant. The target refrigeration temperature is aimed to near the freezing point of nitrogen (63.15 K). A performance map of ejector-JT cycle is accomplished according to the ejector entrainment ratio and the ejector exit pressure. The effect of the ejector on the refrigeration cycle COP is analyzed by calculating the exergy destruction rate at each component of the refrigeration cycle. The exergy analysis shows that the losses at every component of the refrigeration cycle can be reduced using ejector when the entrainment ratio is properly designed. A lab-scale prototype ejector which has a rectangular cross sectional area is fabricated by stacking thin layers of etching plates. The fabricated lab-scale ejector is tested with JT refrigeration circuit, and the nozzles and the diffuser showed 80% isentropic efficiency. Highlights: The new cryogenic refrigeration cycle is developed using ejector. The mixed refrigerant (Ne-N2 ) Joule Thomson system targets 63.15 K with the ejector. The lab-scale ejector is fabricated by etching and diffusion bonding process. The efficiency of ejector is experimentally measured as 80% at cryogenic temperature. The effect of the entrainment ratio and the primary flow inlet temperature on the refrigeration cycle COP is analyzed.