Ammonia absorption in ionic liquids-based mixtures in plate heat exchangers studied by a semi-empirical heat and mass transfer framework

Meng Wang*, Lijuan He, Carlos A. Infante Ferreira

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

12 Citations (Scopus)
186 Downloads (Pure)

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].

Original languageEnglish
Pages (from-to)1302-1317
JournalInternational Journal of Heat and Mass Transfer
Volume134
DOIs
Publication statusPublished - 2019

Keywords

  • Absorption
  • Ammonia
  • Heat transfer
  • Ionic liquid
  • Lithium nitrate
  • Mass transfer
  • Plate heat exchanger

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