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A study on the performance characteristics of carbon dioxide refrigerating systems with multi-speed two-stage compression.

Number: pap. ID108

Author(s) : CARVALHO B. Y. K., MELO C., PEREIRA R. H.

Summary

The light-commercial refrigeration sector considers carbon dioxide (CO2) as a promising natural candidate to replace the conventional synthetic refrigerants, but performance improvements at the cycle level are still required. The aim of this work is to investigate the effect of the compressor speed on the performance characteristics of CO2-based refrigerating systems. To this end a variable speed two-stage rotary compressor was installed in an existing experimental apparatus and an energy optimization exercise was carried out. The optimum refrigerant charge and restriction for each compressor speed was experimentally found and compared. It was noted that Coefficient of Performance (COP) for the whole range of compressor speed reaches a maximum at a single combination of charge and restriction. This suggests that a capillary tube may be used for metering the refrigerant mass flow rate in variable capacity carbon dioxide refrigerating systems, even knowing that at low speeds the evaporator heat exchanges will be negatively impacted by the high evaporation pressures.

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Pages: 7 p.

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Details

  • Original title: A study on the performance characteristics of carbon dioxide refrigerating systems with multi-speed two-stage compression.
  • Record ID : 30012505
  • Languages: English
  • Source: 11th IIR Gustav Lorentzen Conference on Natural Refrigerants (GL2014). Proceedings. Hangzhou, China, August 31-September 2, 2014.
  • Publication date: 2014/08/02

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