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Investigation to improve efficiency of transcritical R-744 two-stage vapour compression systems.

Author(s) : PEUKER J. M., HRNJAK P.

Summary

The objective of this paper is to discuss an experimental investigation of a two-stage compression and expansion system with the intent of showing system performance improvement over a two-stage compression and single expansion system for an air-conditioning application. For the mechanical subcooling system, the low, moderate, and high air-temperature conditions showed a 6 to 8% increase in COP over the baseline system. Additionally, the optimization of the high-side pressure is more critical because variations from the optimum pressure have a larger effect on the COP than adjusting the bypass mass flow rate. Further analysis into the bypass valve operation for the mechanical subcooling system was done using a correlation for a short tube with a constant area.

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Details

  • Original title: Investigation to improve efficiency of transcritical R-744 two-stage vapour compression systems.
  • Record ID : 2009-1493
  • Languages: English
  • Source: 2008 Purdue Conferences. 19th International Compressor Engineering Conference at Purdue & 12th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2008/07/14

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