Abstract
This study proposes the use of new working fluids, refrigerant/IL+ carbon nanomaterials (CNMs), in absorption systems as an alternative to conventional working fluids. In this regard, the thermophysical properties of ammonia and carbon nanomaterials (graphene and single-wall carbon nanotubes) dispersed into [BMIM]BF4 ionic liquid are theoretically investigated. The thermophysical properties of NH3/IL+ CNMs solutions are computed for weight fractions of NH3 in the range of 0.018–0.404 and temperatures between 293 and 388 K. In addition, two weight fractions of CNMs are considered: 0.005 and 0.01, respectively. Our results indicate that by adding a small amount of nanomaterial to the ionic liquid, the solution’s thermal conductivity is enhanced, while its viscosity and specific heat are reduced. Correlations of the thermal conductivity, viscosity, specific heat, and density of the NH3/IL+ CNMs solutions are proposed.
Highlights
Ionic liquids (ILs) are considered a novel type of green working fluid used in various fields, such as absorption refrigeration, solar applications, chemistry, and electrochemistry
Ionic liquids have been considered a promising alternative to the conventional working fluids (NH3 /H2 O and H2 O/LiBr) used as absorbents in absorption refrigeration systems due to their good thermal stability, high absorption capacity, and very low vapor pressure [1,2,3]
Investigations into the application of ammonia/ionic liquids as working fluids in absorption refrigeration systems are limited in the open literature
Summary
Ionic liquids (ILs) are considered a novel type of green working fluid used in various fields, such as absorption refrigeration, solar applications, chemistry (gas capture, storage), and electrochemistry (batteries, sensors). The thermodynamic performance of an absorption chiller using [Emim][dmp]/H2 O was simulated by Zhang and Hu [20] Their results showed that the coefficient of performance was lower than that of a H2 O/LiBr solution, concluding that [Emim][dmp] may be a good absorbent for refrigeration systems. Investigations into the application of ammonia/ionic liquids as working fluids in absorption refrigeration systems are limited in the open literature. Studies on absorption refrigeration systems using ammonia/ionic liquid+nanomaterials as working fluids are not reported in the literature. Correlations for the studied properties, required for the modeling and simulation of the performance of various absorption refrigeration systems, are proposed
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