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Improved rotary vane expander for transcritical CO2 cycle by introducing high pressure into the vane slots.

Author(s) : JIA X., ZHANG B., PU L., et al.

Summary

The loss of contact between the vane tip and cylinder wall was proved to cause a significant leakage and inefficient operation of the rotary vane expander, which was developed to replace the throttling valve in the transcritical CO2 refrigeration system, and an improved structure was suggested by introducing high-pressure gas into the vane slots. This paper presents the experimental investigation of the improved prototype expander. By comparing the vane movement as well as the p-V diagram of the improved prototype with the original one, the effects of introducing high-pressure gas into the slots on the vane movement and thermodynamic processes were analyzed. It was shown that, by introducing the high-pressure gas into the vane slots, the contact between the vane tip and cylinder wall had been improved, resulting in the volumetric efficiency increased from 17 to 35%, and the isentropic efficiency improved from 15 to 45%.

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Pages: 2010-2

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Details

  • Original title: Improved rotary vane expander for transcritical CO2 cycle by introducing high pressure into the vane slots.
  • Record ID : 2010-1822
  • Languages: English
  • Source: 9th IIR-Gustav Lorentzen Conference on Natural Working Fluids (GL2010). Proceedings. Sydney, Australia, April 12-14, 2010.
  • Publication date: 2010/04/12

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