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Analysis of a two-phase flow ejector for the transcritical CO2 cycle.

Author(s) : LIU F., GROLL E. A.

Summary

This paper presents the analysis of a two-phase flow ejector for the transcritical CO2 cycle. A detailed simulation model of a two-phase flow ejector was developed. A controllable ejector expansion device was designed, constructed, and installed in a transcritical CO2 experimental air conditioning system. System-level experimental results were obtained at different operation conditions and various ejector geometries. The ejector expansion model was then utilized to determine the efficiencies of the motive nozzle, suction nozzle, and mixing section using the system-level measured data. It was found that motive nozzle efficiency decreases as ejector throat area decreases and that the suction nozzle efficiency is affected by the outdoor temperature and ejector throat area. In addition, the distance from the motive nozzle exit to the mixing section constant area entry not only affects the suction nozzle efficiency, but also affects the mixing section efficiency.

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Details

  • Original title: Analysis of a two-phase flow ejector for the transcritical CO2 cycle.
  • Record ID : 2009-0177
  • 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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