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Comparison and analysis of expanding process in CO2 transcritical cycle.

Author(s) : ZHA S. T., MA Y. T., LI L. X., et al.

Summary

The isentropic and isenthalpic expanding processes of CO2 transcritical cycle were analyzed thermodynamically. By comparison, the authors find that the effective refrigeration capacity of the cycle with isentropic expanding process is higher than the cycle with isenthalpic expanding process. The increment is slightly larger than the recovered expanding power because of the transcritical cycle. Moreover, two methods, applying internal heat exchanger and using expander instead of throttling valve which can decrease the throttling loss, were compared and analyzed. As a result, the application principle was provided. In addition, the expanding process in expander was thermodynamically analyzed and calculated. The authors find that the recovered work is mainly coming from the flow work in the supercritical area, whereas it wholly results from the internal energy in the liquid gas two-phase area. The changing trend was also illustrated.

Details

  • Original title: Comparison and analysis of expanding process in CO2 transcritical cycle.
  • Record ID : 2006-2209
  • Languages: English
  • Source: Cryogenics and refrigeration. Proceedings of ICCR 2003.
  • Publication date: 2003/04/22

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