Share

Recommended by the IIR / IIR document

Performance measurements of transcritical R744 system using low-complexity ejector.

Number: 292574

Author(s) : BOTTICELLA F., LIU Z., ELBEL S.

Summary

CO2 is a promising refrigerant for numerous applications within the cold chain. The inherent throttling losses of the transcritical cycle can be mitigated by using two-phase ejectors. However, ejectors have yet to be successfully applied to mass-produced systems. Complex ejector designs drive product cost and reduce the likelihood of their widespread use.
The focus of this paper is to systematically determine the performance trade-offs of less complex ejector designs. Various simplified motive nozzle and diffuser designs were experimentally investigated.
While there are differences in ejector efficiency between the different motive nozzle designs on the order of 10 percent points, the effects on system performance (capacity and COP) are far less pronounced. That is especially true when a needle mechanism is used to control the high-side pressure.
Therefore, the study demonstrates that reasonable system improvements can be achieved even with less complex ejector designs, enabling a more widespread use.

Available documents

Paper

Pages: 8

Available

  • Public price

    20 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

PowerPoint version

Pages: 18

Available

  • Public price

    5 €

  • Member price*

    Free

* Best rate depending on membership category (see the detailed benefits of individual and corporate memberships).

Details

  • Original title: Performance measurements of transcritical R744 system using low-complexity ejector.
  • Record ID : 30027578
  • Languages: English
  • Subject: Technology
  • Source: 6th IIR International Conference on Sustainability and the Cold Chain. Proceedings: Nantes, France, August 26-28 2020
  • Publication date: 2020/08/26
  • DOI: http://dx.doi.org/10.18462/iir.iccc.2020.292574
  • Document available for consultation in the library of the IIR headquarters only.

Links


See other articles from the proceedings (84)
See the conference proceedings

Indexing