Thermodynamic Analysis of a Mixed Refrigerant Ejector Refrigeration Cycle Operating with Two Vapor-liquid Separators
A mixed refrigerant ejector refrigeration cycle operating with two-stage vapor-liquid separators (MRERC2) is proposed to obtain refrigeration temperature at -40°C. The thermodynamic investigations on performance of MRERC2 using zeotropic mixture refrigerant R23/R134a are performed, and the comparisons of cycle performance between MRERC2 and MRERC1 (MRERC with one-stage vapor-liquid separator) are conducted. The results show that MRERC2 can achieve refrigeration temperature varying between -23.9°C and -42.0°C when ejector pressure ratio ranges from 1.6 to 2.3 at the generation temperature of 57.3-84.9°C. The parametric analysis indicates that increasing condensing temperature decreases coefficient of performance (COP) of MRERC2, and increasing ejector pressure ratio and mass fraction of the low boiling point component in the mixed refrigerant can improve COP of MRERC2. The MRERC2 shows its potential in utilizing low grade thermal energy as driving power to obtain low refrigeration temperature for the ejector refrigeration cycle.
KeywordsEjector Refrigeration Zeotropic Refrigerant Vapor-liquid Separator Refrigeration Temperature
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- Keenan H., Neumann, E.P. and Lustwer K, F. An investigation of ejector design by analysis and experiment. Journal of Applied Mechanics-transactions of the ASME, 1950, ASME 72: 299–309.Google Scholar
- NIST thermodynamic and transport properties of refrigerants and refrigerant mixtures REFPROP. 2002, NIST Standard Reference Database 23.Google Scholar