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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Experimental Study on the Cooling Performance of a Variable Speed $CO_2$ Cycle with Internal Heat Exchanger and Electronic Expansion Valve

내부열교환기 및 전자팽창장치를 적용한 가변속 이산화탄소 사이클의 냉방성능에 관한 실험적 연구

  • Cho Honghyun (Graduate School of Mechanical Engineering, Korea University) ;
  • Ryu Changgi (Graduate School of Mechanical Engineering, Korea University) ;
  • Kim Yongchan (Department of Mechanical Engineering, Korea University)
  • 조홍현 (고려대학교 기계공학과 대학원) ;
  • 류창기 (고려대학교 기계공학과 대학원) ;
  • 김용찬 (고려대학교 기계공학과)
  • Published : 2005.03.01
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Abstract

Since a transcritical $CO_2$ cycle shows lower performance than conventional air conditioners in the cooling mode operation, it is required to enhance the performance of the $CO_2$ cycle by applying advanced technologies and optimizing components. In this study, the cooling performance of a $CO_2$ system measured by varying refrigerant charge amount, compressor frequency, EEV opening and length of internal heat exchanger. As a result, the cooling COP of the basic system without internal heat exchanger was 2.1. The cooling performance of the modified cycle applying internal heat exchanger improved by $4-9\%$ over the basic cycle.

Keywords

References

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