Thermodynamic screening and analysis of ionic liquids as absorbents paired with low-GWP refrigerants in absorption refrigeration systems

Xiao Zhang, Liang Cai, Tao Chen, Jian Liu and Xiaosong Zhang

Energy, 2023, vol. 282, issue C

Abstract: The combined use of low-GWP refrigerant/ionic liquid (ILs) binary mixtures and their applicable low-pressure compression-assisted absorption refrigeration system (LCARS) could compensate for drawbacks of traditional mixtures. A verified methodology for predicting macroscopic properties based on microchemical structures was thus established for systematic IL screening from a big database of 12080 ILs and 6 HFCs or HFOs and for thermodynamic analysis in systems. Molecular simulation studied the intermolecular characters and absorption affinity, revealing the effects of ions on solubility and the molecular design tendency of ILs for each refrigerant. IL screening was conducted by sequential selection of melting point, viscosity, solubility, and COP. The cations of ammonium, phosphonium, and guanidinium families and the anions of phosphate, phosphinate, sulfate, imide, and carboxylate types, have the relatively stronger affinity with refrigerants. Among ultimately selected 6 mixtures, R134a- and R32-based ones even have stronger affinity relative to traditional mixtures. The auxiliary compression assistance of LCARS reduced optimal generation temperatures and minimum evaporation temperatures while with significantly improved COPs, indicating its superiority for utilization of lower-grade heat sources and for expansion of application occasions. Optimized R152a/[C3M5GU][DMP] verified highest feasibility in absorption systems, due to its high COPs (e.g., 0.571 in base case) and moderate low circulation ratios.

Keywords: Ionic liquids; Low-GWP; Absorption-compression; HFC or HFO refrigerants (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

Downloads: (external link)
http://www.sciencedirect.com/science/article/pii/S036054422301808X
Full text for ScienceDirect subscribers only

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:282:y:2023:i:c:s036054422301808x

DOI: 10.1016/j.energy.2023.128414

Access Statistics for this article

Energy is currently edited by Henrik Lund and Mark J. Kaiser

More articles in Energy from Elsevier
Bibliographic data for series maintained by Catherine Liu ().