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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Comparison of Correlations of Saturated Vapor Density for Some Refrigerants

냉매의 포화증기밀도 상관식 비교

  • Park, Kyoung-Kuhn (School of Mechanical and Automotive Engineering, Kookmin University) ;
  • Kang, Byung-Ha (School of Mechanical and Automotive Engineering, Kookmin University) ;
  • Jang, Si-Youl (School of Mechanical and Automotive Engineering, Kookmin University)
  • 박경근 (국민대학교 기계자동차공학부) ;
  • 강병하 (국민대학교 기계자동차공학부) ;
  • 장시열 (국민대학교 기계자동차공학부)
  • Published : 2007.06.10
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Abstract

Various correlations of saturated vapor density in a truncated power series form are tested and compared in this study. Saturated vapor density correlation can be expressed relating logarithmic reduced density to the reduced temperature. Five types of correlation has been investigated using saturated vapor density data for 22 pure substance refrigerants from ASHRAE (American Society of Heating, Reftigerating and Air-Conditioning Engineers, Inc.) property tables and NIST (National Institute of Standards and Technology) Chemistry Webbook. Correlations are fitted to the data points by least squares method. Data points are equally weighted. The best type of correlation among the five types is suggested. The results obtained indicate that the best correlations with 3, 4, and 5 terms yield average AAD's (Average Absolute Deviation) of 0.27%, 0.04%, and 0.02%, respectively, while widely used conventional correlations with 3, 4, and 5 terms yield those of 1.19%, 0.61%, and 0.17%. The suggested type of correlation could reduce the number of terms while improving performance.

Keywords

References

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