Assessment of vapor–liquid equilibrium models for ionic liquid based working pairs in absorption cycles

Meng Wang, Tim Becker, Carlos Infante Ferreira

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)

Abstract

This paper assesses the performance of vapor–liquid equilibrium (VLE) models in ionic liquid based absorption cycles with natural refrigerants. Frequently used equation-of-state (EOS) based models, activity coefficient based models, and generic Clausius–Clapeyron relations are evaluated. Working pairs considered are H2O/[emim][DMP] and NH3/[bmim][BF4]. Firstly, experimental VLE data of those working pairs are correlated by using the models. Mixing enthalpies are then estimated using the models and corresponding correlated parameters. Performances of the different models in reproducing VLE data and estimating mixing enthalpies are compared with each other. Subsequently, total enthalpies and thermodynamic performances of absorption refrigeration cycles are predicted based on the different models. The assessment reveals that the RK-EOS and the NRTL model perform best in reproducing VLE data. In addition, the RK-EOS and the UNIFAC model show the best performance in estimating mixing enthalpies. Hence, the RK-EOS is recommended in correlating VLE data and estimating mixing enthalpies in absorption cycles.
Original languageEnglish
Pages (from-to)10-25
JournalInternational Journal of Refrigeration
Volume87
DOIs
Publication statusPublished - 2018

Keywords

  • Absorption cycle
  • Ionic liquid
  • Mixing enthalpy
  • VLE
  • EOS
  • Activity coefficient model

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