Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Performance Analysis of Vane Rotary Expander for $CO_2$ Cycles

$CO_2$ 사이클용 로타리 베인 팽창기 성능해석

  • Published : 2009.01.10
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Abstract

Relatively low cycle performance of a conventional $CO_2$ system is partly due to significant increase in friction loss in the expansion process, since the pressure drop across the expansion device is considerably large compared to a conventional refrigeration cycle. To recover friction loss and increase refrigeration effect by providing isentropic expansion, a rotary vane type expander has been designed. Performance of the designed expander has been investigated by numerical simulation. With the pressure condition of 9 MPa/4.5 MPa and inlet temperature of $35^{\circ}C$, volumetric, isentropic, and mechanical efficiencies of the expander are calculated to be 58.1%, 101.1%, and 78.8%, respectively, resulting in total expander efficiency of 46.3%. With this expander, COP of a $CO_2$ refrigeration cycle is estimated to be improved by about 14%.

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References

  1. Hwang Y., 1997, Comprehensive investigation of carbon dioxide refrigeration cycle, Ph. D dissertation, University of Maryland, USA
  2. Hiwata, A. and Sawai, K., 2003, A study of cycle performance improvement with expander-compressor in air conditioning systems, International Conference on Compressors and their systems, London, pp. 339-347
  3. Baek, J. S., Groll, E. A. and Lawless, P. B., 2002, Development of a piston-cylinder expansion device fro the transcritical carbon dioxide cycle, Proceedings of the International Refrigeration Conference at Purdue, USA
  4. Nickl, J., Will, G., Kraus, W. E. and Quack, H., 2003, Third generation $CO_{2}$ expander, International Congress of Refrigeration, Washington, D. C., Paper, No. ICR0571
  5. Tondell, E., 2006, Impulse Expander for $CO_{2}$, 7th IIR Gustav Lorentzen Conference on Natural Working Fluids, Trondheim, pp. 107-110
  6. Huff H., Radermacher, R. and Preissner, M., 2003, Experimental investigation of a scroll expander in a carbon dioxide air-conditioning system, International Congress of Refrigeration, Washington D. C., Paper no ICR0485
  7. Preissner M., 2001, Carbon dioxide vapor compression cycle improvement with focus on scroll expander, Ph. D dissertation, University of Maryland, USA
  8. Munson, B., Young, D. and Okiishi, T., 1990, Fundamentals of Fluid Mechanics, John Wiley and Sons
  9. Yanagisawa, T., Shimizu, T., Chu, I. and Ishijima, K., 1982, Motion Analysis of rolling Piston in Rotary Compressor, Proceedings of the International Refrigeration Conference at Purdue, USA, pp. 185-192