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Basic operating characteristics of CO2 refrigeration cycles with expander-compressor unit.

Author(s) : KOHSOKABE H., FUNAKOSHI S., TOJO K., et al.

Summary

A transcritical CO2 refrigeration cycle with an expander was studied to improve the COP of the cycle of a simple expansion valve by recovering the throttling loss. We developed an expander-compressor unit. A scroll type expander and a rolling-piston type rotary sub-compressor were adopted and connected them with a shaft. With this unit, we made a CO2 refrigeration cycle for a small capacity air-cooled chiller and investigated the basic operating characteristics of the cycle. In experiments, the expander-compressor unit was shown to be stable and to improve the COP of the CO2 chiller cycle under both cooling and heating conditions. The test results indicated that the COP improvement of the cycle was more than 30%, while the total efficiency of the expander-compressor unit was 57%. Expander-compressor units are a key technology for use in CO2 refrigeration systems.

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Details

  • Original title: Basic operating characteristics of CO2 refrigeration cycles with expander-compressor unit.
  • Record ID : 2007-1936
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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