Performance Analysis of Scroll Expander-Compressor Unit for $CO_2$ Transcritical Cycles

$CO_2$ 초임계 사이클을 위한 일체형 스크롤 팽창기-압축기 성능해석

  • Published : 2006.05.01

Abstract

In a two-stage compression $CO_2$ transcritical cycle, application of a scroll expander-compressor unit has been considered in order to improve the cycle COP. For both expander and 1st stage compressor, scroll wrap profile which was originally designed for a R410A air-conditioning cycle mechanism was used with minor modifications: wrap height and involute end angle were adjusted for required displacement volume and built-in volume ratio. For pressure condition of 10 Mpa/3.5 MPa and expander inlet temperature of $35^{\circ}C$, 25% improvement in COP was obtained by using expander-compressor unit. As evaporator pressure increased, COP improvement was lowered mainly due to decreasing compressor peformance.

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References

  1. Hwang, Y., 1997, Comprehensive investigation of carbon dioxide refrigeration cycle, Ph.D dissertation, University of Maryland, USA
  2. NickI, 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
  3. Zha, S., Ma, Y. and Sun, X., The development of $CO_2$ expander in $CO_2$ transcritical cycles, International Congress of Refrigeration, Washington D. C., Paper No. ICR0089
  4. Fukuta, M, Yanagisawa, T. and Radermacher, R., 2003, Performance prediction of vane type expander for $CO_2$ cycle, International Congress of Refrigeration, Washington D. C., Paper No. ICR0251
  5. Preissner, M., 2001, Carbon dioxide vapor compression cycle improvement with focus on scroll expander, Ph.D dissertation, University of Maryland, USA
  6. Westphalen, D. and Dieckmann, J. 2004, Scroll expander for carbon dioxide air conditioning cycles, International Refrigeration and Air Conditioning Conference, Purdue, USA, Paper No. R023
  7. 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