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Blast freezers. 1. R717 versus R717/R744 cascade.

Number: pap. n. 25

Author(s) : BANASIAK K., HAFNER A., WIDELL K. N.

Summary

An ammonia / carbon dioxide (R717/R744) cascade model was designed to be able to simulate the freezing process of pelagic fish. The modelling language Modelica was applied and it was implemented in the simulation environment Dymola Control. Various simulations were performed for a typical design of the freezing tunnel. The total energy consumption of the R717/R744 cascade unit was compared to a state of the art two-stage R717 system. The results show that the R717/R744 cascade system architecture, when properly designed, offers comparable overall energy performance at a reduced freezing time, compared to the conventional ammonia system. What is more, the cascade offers the possibility to reduce the evaporation temperature in the R744 bottom cycle to further reduce the freezing time.

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Pages: 8 p.

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Details

  • Original title: Blast freezers. 1. R717 versus R717/R744 cascade.
  • Record ID : 30014631
  • Languages: English
  • Source: 6th Conference on Ammonia and CO2 Refrigeration Technology. Proceedings: Ohrid, North Macedonia, April 16-18, 2015.
  • Publication date: 2015/04/16

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