Characteristics of Working Fluid Flow in Convergent-Divergent Injectors in Vapor Compression – Steam Jet Refrigeration

Firman Firman, Muhammad Anshar, Amrullah Amrullah


The vapor compression refrigeration-steam jet refrigeration system (VCR-SJR) is one of the technological innovations that have been widely applied. Vapor compression refrigeration (VCR) and steam jet refrigeration (SJR) are connected by an intercooler. The VCR unit uses the Hydrocarbon MC 22 refrigerant working fluid. The vacuum process in the SJR unit is provided by a convergent-divergent type injector. The performance of the VCR-SJR refrigeration engine is influenced by the characteristics of the working fluid flow in the injector. The technological innovation of this research is the combined VCR-SJR refrigeration machine using a convergent-divergent type injector in the SJR unit and the VCR unit using MC 22 refrigerant. This study aims to determine the characteristics of the working fluid flow in the injector of the VCR-SJR refrigeration machine. The characteristics are the working fluid flow and pressure profiles in the convergent-divergent injector with variations in the suction injector diameter. Visual fluid flow analysis in convergent-divergent injectors is performed by simulation using ANSYS 16.0 with a FLUENT system analysis feature. Validation is carried out by testing an injector that has the following dimensions: suction chamber diameter 28 mm, nozzle inlet diameter 14 mm, suction chamber length 58 mm, secondary fluid inlet diameter (10, 15, and 20 mm), nozzle outlet diameter 5 mm, mixing chamber length 130 mm, throat length 95 mm, diffuser length 130 mm, and injector outlet side diameter 40 mm. It is concluded that the suction side diameter affects the working fluid flow profile in the injector.


Keywords: refrigeration, vapor compression, steam jet, working fluid, injector.

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SUVARNAKUTA N, PIANTHONG K, SRIVEERAKUL T, & SEEHANAM W. Performance analysis of a two-stage ejector in an ejector refrigeration system using computational fluid dynamics. Engineering Applications of Computational Fluid Mechanics, 2020, 14(1): 669-682.

SHET U S P, SUNDARARAJAN T, & MALLIKARJUNA JM. Refrigeration Cycles. Madras: Indian Institute of Technology, 2014

SIOUD D, GARMA R, & BELLAGI A. Optimization of Steam Ejector Design and Performance. International Journal of Scientific Research & Engineering Technology, 2019, 9: 1-5.

KEERATIYADATHANAPAT N, SRIVEERAKUL T, SUVARNAKUTA N, & PIANTHONG K. Experimental and Theoretical Investigation of s Hybrid Compressor and Ejector Refrigeration System for Automotive Air Conditioning Application. Engineering Journal, 2017, 21(5): 105-123.

HADJ A, & BOULENOUAR M. CFD analysis of operating condition effects on optimum nozzle exit position of a supersonic ejector using the refrigerant 134a. Comptes Rendus Mecanique, 2021, 349(1): 189-202.

MOGHADDAM HA, SHFAEE M, & RIAZI R. Numerical Investigation of a Refrigeration Ejector: Effects of Environment-Friendly Refrigerant and Geometry of the Ejector Mixing Chamber. European Journal of Sustainable Development Research, 2019, 3(3), em0090: 0-17.

SAHNI R. Ejector Expansion Refrigeration Systems Research Invent. International Journal of Engineering and Science, 2015, 5(2): 25-29.

BAZAGNI G, MEREU R, & INZOLI F. Ejector Refrigeration: A comprehensive Review. Journal of Renewable and Sustainable Energy Reviews, 2016, 53: 373-407.

ELBARGHTHI A F A, MOHAMED S, NGUYEN V V, & DVORAK. V CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf). Energies, 2020, 13, 1408: 1-19.

ALDAS K, SEN F, & OZKUL I. The Investigation of Gas Ejector Performance using CFD Modelling. TEM Journal, 2013, 2(2): 130-135.

KOH J H, ZAKARIA Z, & VEERASAMY D. Hydrocarbons as Refrigerants-A Review. ASEAN Journal of Science and Technology for Development, 2017, 34(1): 35-50.

FIRMAN F., & ANSHAR M. Experimental Investigation of Boiling Heat Transfer Coefficient of MC-22 on Horizontal Copper Rod. Proceedings of 7thAnnual Southeast Asian International Seminar, Bogor, Indonesia, 2018: 7-8.

CHUNNANNOND K, & APHORNRATANA S. Ejectors. Journal of Renewable and Sustainable Energy; Reviews, 2004, 8: 129-155.

MUHAMMAD, H.A. et al. Numerical Modeling of Ejector and Development of Improved Methods for the Design of Ejector-Assisted Refrigeration System. Energies, 2020, 13, 5835: 1-19.

MA ZH, BAO H, & ROSKILLY A P. Thermodynamic modelling and parameter determination of ejector for ejection refrigeration systems. International Journal of Refrigeration, 2017, 75: 117-128.

FIRMAN F, & ANSHAR M. Study on steam pressure characteristics in various types of nozzles. Journal of Physics: Conference Series, 2018, 979: 012084. The 2nd International Conference on Science, 2-3 November 2017, Makassar, Indonesia,

NARAYANA K S, & REDDY K S. Simulation of Convergent Rocket Nozzle using CFD Analysis. IOSR Journal of Mechanical and Civil Engineering, 2016, 13(4) Ver. I: 58-65.

VENKATESH V, & REDDY C J P. Modelling and Simulation of Supersonic Nozzle Using Computational Fluid Dynamics. International Journal of Novel Research in Interdisciplinary Studies, 2015, 2(6): 16-27.

SUDHAKAR B V V N, SEKHAR B P C, MOHAN P N, & AHMAD MT. Modelling and simulation of Convergent-Divergent Nozzle Using Computational Fluid Dynamics. International Research Journal of Engineering and Technology, 2016, 03(08): 346-350.

PATEL A R, and KHUNT M J. Performance Optimization of Steam Jet Ejector using CFD. International Journal for Innovative Research in Science & Technology, 2015, 2(1): 1275-1278.


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