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Numerical simulation on scroll expander-compressor unit for CO2 transcritical cycles.

Author(s) : KIM H. J., AHN J. M., CHO S. O., et al.

Summary

In a two-stage compression CO2 transcritical cycle, application of a combined scroll expander-compressor unit has been considered in order to improve the cycle COP. For the combined scroll expander-compressor unit, power was recovered from a scroll expander which replaced the expansion valve and transmitted to the first stage auxiliary compressor which was directly coupled to the expander through a common crankshaft. Numerical simulation on its performance showed that for the suction pressure of 3.5 MPa, discharge pressure of 10MPa with expander inlet temperature of 35°C, the main compressor input could be reduced by 12.1% by the expander output. Increase in the cooling capacity by the expander was 8.6%. As a consequence, COP improvement of the cycle was estimated to be 23.5% by the application of this expander-compressor unit. COP improvement increased with lowering the expander inlet temperature, but decreased with increasing the suction pressure. Performance of the scroll expander was relatively insensitive to changes of operating pressure ratio, whereas that of the scroll compressor decreased rapidly as the operating pressure ratio became far from the design pressure ratio.

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Details

  • Original title: Numerical simulation on scroll expander-compressor unit for CO2 transcritical cycles.
  • Record ID : 2007-1942
  • 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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