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Performance prediction of vane type expander for CO2 cycle.

Author(s) : FUKUTA M., YANAGISAWA T.

Summary

Since the inherent COP of an air-cooled CO2 cycle is lower than that of HFCs, both compressors and the cycle performance should be improved. The most promising method for improving the performance of a CO2 cycle is to recover throttling loss by using an expander as an expansion device. In this study, a vane type expander is considered. The expansion process from the supercritical condition to the two-phase one in the expander and the performance of the expander were analysed with a mathematical model. Although a large expansion volume ratio is not achievable with the vane type expander, the decrease in the performance due to the small expansion ratio is acceptable. The influence of leakage on the performance of the vane expander is dominant, while the heat transfer from the expander body to the fluid has a relatively small influence on the performance.

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Details

  • Original title: Performance prediction of vane type expander for CO2 cycle.
  • Record ID : 2004-2117
  • Languages: English
  • Source: 21st IIR International Congress of Refrigeration: Serving the Needs of Mankind.
  • Publication date: 2003/08/17

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