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Evaluation of the potential of using ejector system in autocascade systems for ultralow temperature refrigerators.

Number: 0123

Author(s) : OSSORIO R., GUITIERREZ M. A., NAVARRO-PERIS E.

Summary

Applications like ultralow temperature refrigerators work at very high-pressure ratios, and as a consequence, the use of ejectors could also represent a considerable improvement potential. Now, these systems use what is known as Autocascade Refrigeration Cycles (ARC) in order to be able to overcome the high-temperature difference at a reasonable cost. This study presents a theoretical investigation of an Ejector Autocascade Refrigeration Cycle (EARC) with a zeotropic refrigerant mixture based on hydrocarbons (R600a/R1150). Energetic and exergetic performance comparisons were conducted among the EARC and ARC cycles with common refrigerant blends (R134a/R23 and R290/R170) as a function of the operating conditions (mass fraction ratio of the mixture and ejector efficiency). The results indicated that the EARC had more advantages over the conventional cycles with coefficient of performance (COP) and exergy efficiency improvements greater than 16% with ejector efficiencies of 100%. R600a/R1150 with an optimal mass fraction ratio of 0.65/0.35 was proposed.

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Pages: 8 p.

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Details

  • Original title: Evaluation of the potential of using ejector system in autocascade systems for ultralow temperature refrigerators.
  • Record ID : 30029723
  • Languages: English
  • Subject: Technology
  • Source: 15th IIR-Gustav Lorentzen Conference on Natural Refrigerants (GL2022). Proceedings. Trondheim, Norway, June 13-15th 2022.
  • Publication date: 2022/06/13
  • DOI: http://dx.doi.org/10.18462/iir.gl2022.0123
  • Document available for consultation in the library of the IIR headquarters only.

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