Journal of the Korea Academia-Industrial cooperation Society (한국산학기술학회논문지)

The Korea Academia-Industrial cooperation Society (한국산학기술학회)
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Comparative Study on the Properties Estimation of the Constituents of the Natural Gas and Refrigerant Mixtures Between GERG-2004 Model and Peng-Robinson Equation of State

GERG-2004 모델식과 Peng-Robinson 상태방정식을 이용한 천연가스 및 냉매 구성성분들의 물성 비교연구

  • Kim, Mi-Jin (Department of Chemical Engineering, Kong Ju National University) ;
  • Rho, Jae-Hyun (Department of Chemical Engineering, Hoseo University) ;
  • Kim, Dong-Sun (Department of Chemical Engineering, Kong Ju National University) ;
  • Cho, Jung-Ho (Department of Chemical Engineering, Kong Ju National University)
  • Received : 2011.11.07
  • Accepted : 2012.02.10
  • Published : 2012.02.29
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Abstract

In this study, we compared with results simulated by EOS(Equation of State) using Peng-Robinson model and GERG-2004 model for estimating vapor pressure, latent heat of vaporation, liquid density, and binary isotherm vapor-liquid equilibrium on pure components composing natural gases. We obtained the simulated results that while EOS using GERG-2004 model is more accurate than EOS using Peng-Robinson model for estimating liquid density, but rather it is less accurate for estimating binary isotherm vapor-liquid equilibrium. On the other hand, the use of Costald model in EOS using Peng-Robinson model for increasing more accuracy to calculate liquid density is almost same as EOS using GERG-2004 model within the error of 1 % compared with experimental data. Also, we confirmed that on the estimation of binary isotherm vapor-liquid equilibrium, EOS using GERG-2004 model is more accurate than EOS using Peng-Robinson model, but they are almost same.

본 연구에서는 천연가스 및 냉매를 구성하고 있는 성분들에 대한 증기압, 증발잠열, 액상의 밀도 및 이성분계 기액 상평형을 추산하는데 있어서 GERG-2004 모델식과 Peng-Robinson(PR) 상태방정식을 서로 비교하였다. 비교결과 GERG-2004모델식은 액상의 밀도 추산에 있어서 PR 상태방정식에 비해 정확성이 높았으나, 기액 상평형 추산에 대한 정확성은 오히려 낮았다. 한편, PR 상태방정식에서 Costald 상관 관계식을 사용하여 액상의 밀도를 추산한 경우에는 실험값과 오차율이 1% 이내로써 GERG-2004 모델식을 사용한 추산 결과와 거의 차이가 없었으며, 증기압과 증발 잠열의 추산은 GERG-2004모델식과 PR 상태방정식이 거의 유사한 결과를 나타냄을 알 수 있었다.

Keywords

References

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