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Modelling of a diphasic CO2 ejector for cooling circuit.

Number: pap. n. 1099

Author(s) : NATTES P. H., TREMEAC B., TERRIER M. F., et al.

Summary

Ejectors as alternative to expansion valves are used to increase efficiency of cooling circuits. To cope with different mass flows or inlet pressures, adaptable ejectors and multiple ejectors are utilized. A simplified model is needed to size an ejector in a circuit. It must be fast and accurate to be included in dynamic simulations of cooling circuits. This article proposes a 1D model to calculate
the entrainment ratio and the pressure recovery of a supersonic ejector. It is based on data from literature and a CO2 test bench with adaptable ejector not presented in this paper. The model uses few experimental points for calibration and the mixing process is modelled in a different way compared to previous articles. The entrainment ratio is calculated with a precision of 10%. The model is validated with CO2 for high pressures ranging from 9.0 MPa to 12.0 MPa and low pressure from 2.3 MPa to 3.6 MPa.

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Pages: 8

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Details

  • Original title: Modelling of a diphasic CO2 ejector for cooling circuit.
  • Record ID : 30026696
  • Languages: English
  • Source: Proceedings of the 25th IIR International Congress of Refrigeration: Montréal , Canada, August 24-30, 2019.
  • Publication date: 2019/08/24
  • DOI: http://dx.doi.org/10.18462/iir.icr.2019.1099
  • Notes:

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