A novel thermodynamic design model of a new HFO refrigerant single phase vapor jet cooling system

•The ejector performance is very sensitive to its dimensions.•Ultimate performance is achieved only if the ejector is double chocked.•Optimum ejector size depends mainly on the system operating conditions.•R1234yf is confirmed to be a promising substitute to R134a in ejector systems. Vapor jet refri...

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Bibliographic Details
Published in:International journal of refrigeration 2020-02, Vol.110, p.153-167
Main Authors: Rashed, M., Huzayyin, O., Kassem, M.A., Kaseb, S.
Format: Article
Language:English
Subjects:
Cooling
Cooling systems
Dimensionnement
Ejectors
Entrainment
Entrainment ratio
HFO-R1234yf
Hydrofluorocarbons
Low grade energy
Mathematical models
Modelling
Modélisation
Refrigerants
Refrigeration
Single-phase ejector
Sizing
Taux d’entrainement
Thermodynamics
Vapor compression refrigeration
Vapor jets
Éjecteur monophasique
Énergie à basse température
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Summary:•The ejector performance is very sensitive to its dimensions.•Ultimate performance is achieved only if the ejector is double chocked.•Optimum ejector size depends mainly on the system operating conditions.•R1234yf is confirmed to be a promising substitute to R134a in ejector systems. Vapor jet refrigeration system has been a promising research topic by far. This system bears such importance due to using low grade energy instead of the less economical high grade energy necessary for driving the conventional vapor compression refrigeration cycles despite the low COP values. The main purpose of the present work is to introduce a mathematical model to optimally size the single phase supersonic vapor ejector and to give a detailed picture on how the system operating conditions affect the main dimensions of the optimally operated ejectors. On the other hand, this paper is a predesign study of the operating conditions effect on the system performance parameters like the COP, entrainment and area ratios. The model is validated with experimental data mentioned in the literature and it gives high trusted results. Moreover, the model is general as it can be used with any refrigerant. However, the present results belong to the environment friendly hydro-fluoroolefin refrigerant (R1234yf) which will be increasingly adopted and a potential alternative for the currently used hydroflourocarbon (HFC) R134a.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2019.10.029