Ammonia absorption in ionic liquids-based mixtures in plate heat exchangers studied by a semi-empirical heat and mass transfer framework
Meng Wang (TU Delft - Engineering Thermodynamics)
Lijuan He (Inner Mongolia Normal University China)
C.A. Infante Ferreira (TU Delft - Engineering Thermodynamics)
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Abstract
Unfavorable transport properties have always been pointed out as the key factors that hinder the application of ammonia/ionic liquids (NH
3
/ILs) in absorption cycles, while heat and mass transfer of these new fluids in components have been rarely reported. In this study, a corrugated plate heat exchanger is selected as the geometry for exploring the absorption of NH
3
in the proposed NH
3
/ILs working fluids. The process is studied making use of a semi-empirical framework: experimental data is needed to determine unknown information of heat and mass transfer, and a numerical model is developed making use of frequently applied theories. In addition, relevant transport properties of the NH
3
/ILs working fluids are modeled based on collected experimental data. The proposed model is used to study the heat and mass transfer performance during the absorption of NH
3
vapor into NH
3
/ILs fluids. Distribution of local parameters and overall heat and mass transfer characteristics are obtained. The performance of absorption of NH
3
into different working fluids is investigated as well. The overall heat transfer coefficient is found around 1.4 kW/(m
2
·K) for the most promising working fluid NH
3
/[emim][SCN].
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