| Title |
Comparison of Correlations of Saturated Vapor Density for Some Refrigerants |
| Authors |
박경근(Kyoung Kuhn Park) ; 강병하(Byung Ha Kang) ; 장시열(Siyoul Jang) |
| Keywords |
상관식 ; 포화증기밀도 ; 열역학적 상태량 Correlation ; Saturated vapor density ; Thermodynamic pro-perty |
| 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, Refrigerating 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. |