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CO2-expander/compressor for subcritical and transcritical operation.

Author(s) : RIHA J., QUACK H., NICKL J.

Summary

The primary objectives to use a combined expander/compressor unit in a CO2 refrigeration cycle are to improve the COP and to reduce the exhaust pressure of the main compressor of the system. With the successful development of such an expander/compressor by the TU Dresden, the primary objectives have been reached. In summer as well as in warmer regions of the world the ambient temperature is higher then the critical temperature of the CO2. That means that the refrigeration system operates in a transcritical mode. For these operation conditions the expander was originally developed. But in Central and Northern Europe and many other regions of the world, the ambient temperature is during long periods of the year and during the night so low, that the condensing pressure of the CO2 refrigeration system can be kept below 70 bars, i.e. that the cycle can be operated in a subcritical mode. This requirement implicates for the expander quite different working conditions and this has to be investigated.

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Pages: 2006-5

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Details

  • Original title: CO2-expander/compressor for subcritical and transcritical operation.
  • Record ID : 2007-0074
  • Languages: English
  • Source: Compressors 2006: 6th International Conference on Compressors and Coolants
  • Publication date: 2006/09/27

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