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Improvement of vane motion in a rotary vane expander for a CO2 heat pump cycle.

Author(s) : KIM H. J., KIM W. Y., AHN J. M., et al.

Summary

In order to recover friction loss in the expansion process and increase refrigeration effect in a CO2 heat pump cycle, a rotary vane expander has been designed. Numerical simulation has been carried out to estimate the performance of designed expander, and it has been found that vane jumping or vane recession from the cylinder wall occurs in a certain range of the crank angle. To improve the vane motion, a way of pressurizing of the vane back chamber has been employed, and elimination of the vane jumping phenomenon has been confirmed by the numerical simulation. With the operating pressure condition of 9/4.5 MPa and inlet temperature of 35°C, the expander efficiency has been calculated to be 42.72%, and improvement of COP of a CO2 heat pump cycle with this expander has been estimated to be about 9.74%.

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Pages: 2010-2

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Details

  • Original title: Improvement of vane motion in a rotary vane expander for a CO2 heat pump cycle.
  • Record ID : 2010-2030
  • 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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