Characteristics of Absorption Equilibrium with HFC-134a and an Ionic Liquid Pair
- 1 Department of Chemical Engineering, Faculty of Engineering, Fukuoka University, Fukuoka, Japan
- 2 Department of Chemical Systems Engineering, Graduate School of Engineering, Nagoya University, Fukuoka, Japan
- 3 Department of Chemical Engineering, Faculty of Engineering, Fukuoka University, Fukuoka, Japan
- 4 Department of Chemical Engineering, Faculty of Engineering, Fukuoka University, Fukuoka, Japan
Abstract
Cold energy generation systems must be improved to prevent catastrophic climate change. In this study, we focused on an absorption chiller cycle with HFC-134a and an ionic liquid pair as the refrigerant and absorbent, respectively. It was expected that this absorption chiller cycle could generate cold heat below 0 ° C. Two liquids were selected and their absorption equilibrium with this pair was evaluated for the absorption chiller cycle. We measured the adsorbed amount at equilibrium with 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [BMIM][Tf2N] and N-trimethyl-N-butylammonium bis(trifluoromethanesulfonyl)imide [N1113][Tf2N]. The experimental results were reproduced using the non-random two liquid (NRTL) model. This analysis model corresponded well in terms of the amount of adsorption at equilibrium with the experimental results. A Duhring diagram was also generated the NRTL model, and the absorption cycle characteristics as a function of temperature were determined. The absorption chiller cycle obtained cold heat at 10 ° C with a regeneration temperature of 70 ° C in addition to generating cold heat below 0 ° C.
- U.S. Energy Information Administration (2017) International Energy Outlook. https://www.eia.gov/outlooks/ieo/
- Sabbagh, A.A. and Gómez, J.M. (2018) Optimal Control of Single Stage LiBr/Water Absorption Chiller. International Journal of Refrigeration, 92, 1-9. https://doi.org/10.1016/j.ijrefrig.2018.05.007
- Ihtsham-ul-Haq Gilani, S. and Ahmed, M.S.M.S. (2015) Crystallization Detection for Double-Effect LiBr-H 2 O Steam Absorption Chiller. Energy Procedia, 75, 1522-1528. https://doi.org/10.1016/j.egypro.2015.07.304
- Minea, A.A. and Murshed, S.M.S. (2018) A Review on Development of Ionic Liquid Based Nanofluids and Their Heat Transfer Behavior. Renewable and Sustainable Energy Reviews, 91, 584-599. https://doi.org/10.1016/j.rser.2018.04.021
- Dong, L., Zheng, D.X. and Wu, X.H. (2012) Working Pair Selection of Compression and Absorption Hybrid Cycles through Predicting the Activity Coefficients of Hydrofluorocarbon + Ionic Liquid Systems by the UNIFAC Model. Industrial & Chemistry Research, 51, 4741-4747. ttps://doi.org/10.1021/ie202029d
- Yokozeki, A., Sato, H. and Watanabe, K. (1997) Ideal-Gas Heat Capacities and Virial Coefficients of HFC Refrigerants. International Journal of Thermophysics, 19, 89-127. https://doi.org/10.1023/a:1021499018749
- Shiflett, M.B. and Yokozeki, A. (2006) Solubility and Diffusivity of Hydrofluorocarbons in Room-Temperature Ionic Liquids. AIChE Journal, 52, 1205-1219. https://doi.org/10.1002/aic.10685
- Walas, S.M. (1985) Phase Equilibria in Chemical Engineering. Butterworth, Boston.
- Shiflett, M.B., Harmer, M.A., Junk, C.P. and Yokozeki, A. (2006) Solubility and Diffusivity of 1,1,1,2-Tetrafluoroethane in Room-Temperature Ionic Liquids. Fluid Phase Equilibria, 242, 220-232. https://doi.org/10.1016/j.fluid.2006.01.026