Excess enthalpy prediction for ionic liquids based absorption systems

Conference paper (2017)

Authors

M. Wang Engineering Thermodynamics - Mechanical, Maritime and Materials Engineering
C.A. Infante Ferreira Engineering Thermodynamics - Mechanical, Maritime and Materials Engineering
Research Group
Engineering Thermodynamics (Mechanical, Maritime and Materials Engineering) (TU Delft)
Model Performance Absorption Ionic liquid Thermodynamics Enthalpy Refrigerating system
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Published Date

2017

Language

English

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Faculty

Mechanical, Maritime and Materials Engineering

Department

Process and Energy

Research Group

Engineering Thermodynamics

Abstract

Excess enthalpy is crucial in investigating absorption refrigeration and heat pump cycles. Apart from a direct measurement, it can be estimated from vapor-liquid equilibrium (VLE) data by using thermodynamic models. Models which can be used are equation-of-state (EOS) based model, activity-coefficient based methods, and generic Clausius-Clapeyron relation. This paper assesses the performance of different models in the excess enthalpy prediction of natural refrigerants/ILs pairs for absorption cycles. First, the fundamental theories on excess enthalpy prediction with different thermodynamic models are introduced. Then, the VLE data of two working pairs are fitted and used to estimate excess enthalpy by these models. The predicted results are compared with measured ones for the pair H2O/[emim][DMP]. The influence of fitted parameters on the excess enthalpy prediction is also discussed. The assessment reveals the predicted excess enthalpies have quite large deviations compared with the measured values. UNIFAC and Redlich-Kwong EOS models perform best with relatively smaller errors.

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