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Integration of a three-stage expander into a CO2 refrigeration system.

Author(s) : QUACK H., KRAUS W. E., NICKL J., et al.

Summary

The inclusion of an expander with work recovery provides two advantages for transcritical CO2 refrigeration cycles: The COP is improved and the exhaust pressure of the main compressor is lowered. Several designs of expanders have been proposed for this application and some prototypes have been tested already. This paper deals with the question, how such an expander could be integrated into the overall system, where it should be located and how the "condensate" should be distributed to the different cooling locations. For optimum integration into the overall system it is proposed to install a vapour-liquid separator between the second and third stage of expansion. The vapour would be guided back to the third expander stage whereas the liquid is supplied to the cooling stations via thermostatic or electronic expansion valves or stored in a receiver.

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Pages: 2004-2

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Details

  • Original title: Integration of a three-stage expander into a CO2 refrigeration system.
  • Record ID : 2005-1771
  • Languages: English
  • Source: Natural Working Fluids 2004: 6th IIR-Gustav Lorentzen Conference
  • Publication date: 2004/08/01

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