Assessment of Aqueous Lithium-based Salt Solutions as Working Fluid for Absorption Chillers using Aspen Plus

Adonis P. Adornado(1*), Allan N. Soriano(2), Vergel C. Bungay(3)

(1) School of Chemical, Biological, and Materials Engineering and Sciences, Mapúa University, Intramuros, Manila 1002, Philippines
(2) School of Chemical, Biological, and Materials Engineering and Sciences, Mapúa University, Intramuros, Manila 1002, Philippines
(3) Department of Chemical Engineering, De La Salle University, Taft Ave., Manila 1004, Philippines
(*) Corresponding Author


Absorption chillers are a viable option for providing waste heat-powered cooling
or refrigeration, thereby improving overall energy efficiency-less primary energy input,
lower emissions, and cost savings. This study focuses on the assessment of aqueous
lithium-based salt solutions as working fluid for absorption chiller in exploring the
possibility of developing new mixtures for absorption chillers to improve the performance
of the absorption refrigeration systems (ARSs). In this paper, the coefficient of
performance (COP) of a single-effect absorption chiller using aqueous lithium-based salt
solutions (LiF-H2O, LiCl-H2O, LiBr-H2O, and LiI-H2O) as working fluid was assessed using
Aspen Plus®. The simulation results obtained showed that the mass and energy were well
balanced for all systems. Furthermore, a direct proportionality relationship between COP
of absorption chillers and the van't Hoff factor, i of dissociated aqueous salt solutions was
observed. The highest COP value is 0.8930 for LiI-H2O among others.


absorption chiller, lithium-based salt, refrigerant-absorbent pairs, water, coefficient of performance, Aspen Plus®

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