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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Simulation Study on the Performance Characteristics of a $CO_2$ Cooling System with an Expander

팽창기를 적용한 이산화탄소 냉방시스템의 성능특성에 관한 해석적 연구

  • Cho, Hong-Hyun (Graduate School, Department of Mechanical Engineering, Korea University) ;
  • Baek, Chang-Hyun (Graduate School, Department of Mechanical Engineering, Korea University) ;
  • Ryu, Chang-Gi (Hyundai & Kia Corporate R&D Division, Hyundai & Kia motor) ;
  • Kim, Yong-Chan (Department of Mechanical Engineering, Korea University)
  • 조홍현 (고려대학교 기계공학과 대학원) ;
  • 백창현 (고려대학교 기계공학과 대학원) ;
  • 류창기 (현대자동차(주)) ;
  • 김용찬 (고려대학교 기계공학과)
  • Published : 2007.09.10
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Abstract

A $CO_2$ cycle shows large throttling loss during the expansion process. The application of an expander into the $CO_2$ cycle can reduce the throttling loss and then improve system performance. In this study, the performance of a transcritical $CO_2$ cycle with an expander was analytically investigated in order to improve the cooling performance of the system. The expander was applied to the single-stage and two-stage compression cycles. The performance was analyzed with the variations of compressor frequency, outdoor temperature, and expander efficiency. The single-stage and two-stage compression cycles with the expander showed COP improvement of 25% and 32%, respectively, over the single-stage cycle with an EEV.

Keywords

References

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