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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Influence of Charging Amounts on the Cooling Performance of $CO_2/Propane$ Mixtures and Concentration Shift Behavior

이산화탄소/프로판 혼합냉매의 냉방성능에 대한 충전량의 영향 및 순환성분비 변화 특성

  • Kim, Ju-Hyok (School of Mechanical and Aerospace Engineering, Seoul National University) ;
  • Hwang, Yun-Wook (Energy System Research Center, Korea Institute of Machinery and Materials) ;
  • Kim, Min-Soo (School of Mechanical and Aerospace Engineering, Seoul National University)
  • 김주혁 (서울대학교 기계항공공학부) ;
  • 황윤욱 (한국기계연구원 에너지기계연구센터) ;
  • 김민수 (서울대학교 기계항공공학부)
  • Published : 2006.11.10
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Abstract

[ $CO_2$ ] and propane mixtures, which are environmentally benign, nontoxic, low in price, and compatible with materials and lubricants, were considered as promising alternative refrigerants. A fully instrumented air-conditioning system was developed for a precise performance evaluation of pure $CO_2$ and $CO_2/propane$ mixtures. In this paper, the effect of the charging amount and circulation concentration on the cooling performance of the system using $CO_2$ and propane mixtures was tested and discussed. Pure $CO_2$ and 85/15, 75/25 and 60/40 binary blends by the charged mass percentage of $CO_2/propane$ were selected as working fluids. An optimum charging amount was proposed as a parameter instead of the degree of subcooling, which can not be well defined in the transcritical cycle, to properly compare the performance between the transcritical and subcritical cycles.

Keywords

References

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