Thermo-physical properties of the nano-binary fluid (acetone–zinc bromide-ZnO) as a low temperature operating fluid for use in an absorption refrigeration machine

Abstract

The current technical note is an expression for extending aspects of the previous work of Ajib and Karno [1] which related to the thermophysical properties of acetone / ZnBr2. The study covers the thermal conductivity of a solution which appears to be a promising fluid for operating vapour absorption refrigeration (VAR) systems from a low temperature source. It covers also an investigation of acetone / ZnBr2 -ZnO nanofluid including the preparation, stability, structure and properties, a zinc based nanoparticle being chosen in order to reduce chemical interactions. Furthermore, this study illustrates an extension of the log p, T diagram of the acetone zinc bromide up to 1.39 bar. The results show that the thermal conductivity drops with increasing salt concentration. With increasing nanoparticles, the density, viscosity and the thermal conductivity increase, as expected, but the heat capacity drops. Both theoretical and experimentally derived formulae for ZnO nano fluid conductivity from the literature are seen to produce good correspondence to the conductivity measured here, but in the case of the theoretical formula, the influence of particle morphology is seen to be significant. The results indicate that converting the acetone / ZnBr2 to a nanofluid provides a potential improvement of performance of this fluid in the vapour absorption refrigeration system, but that suspension stability is difficult to attain.

Thermophysical Properties of Nanoferrofluid (Fe3O4 –Acetone/Znbr2) as a Working Fluid for Use in Absorption Refrigeration Applications

“…The measured density of several acetone/ZnBr2 concentrations at 25°C in this study was significantly similar to those investigated by Mohammed et al [15] and dissimilar to which was investigated by Ajib and Karno [14]. Because of the increase of the solution volume when the salt (ZnBr2) is added and dissolved in the solvent (acetone) which was not taken into account in Ajib and Karno study [14].…”

“…During preparing the based-fluid working solution heat is emitted from the mixture because of the dissolve reaction, which may reach 65°C depending on added ZnBr2 concentration to the acetone. So the mixture is cooled down in certain time periods during mixing because the heating of metal particles would lead to the evaporation of refrigerant in the mixture [15]. In order to understand the dispersion characteristics of the Fe3O4 nanoparticles in the solutions for the experiments, a Scanning Electron Microscope (SEM) analysis of the nanoferrofluid samples is carried out.…”

“…Mohammed et al [15] had found that the heat or light (or both of them) has an effect on changing the color of acetone/ZnBr2 and becomes brown over time. However, in the current study, it is found that even in a dark medium (dimming by using aluminum paper) with in-room temperature (25 °C), the color of the solution changes to brown over time as is shown in Figure 1.…”

“…In literature, only one experimental investigation has been performed to determine the thermophysical properties of the suggested acetone/ZnBr2 solution, [14]. And just one more researcher studied the thermophysical properties of the suggested working solutions as nanofluids by using ZnO and graphene in two separate investigations as suspension nanoparticles, [15][16]. At the same time, no previous study has tested the nanoferrofluid based acetone/ZnBr2 as it is performed in this work.…”

Parametric investigation of a chilled water district cooling unit using mono and hybrid nanofluids

“… Ref. Nanofluid used Method Device Used as Key findings 36 MWCNT-CuO (30–70%)/SAE50 Experiment Vapour compression system Nano-lubricant For high volume fractions (> 1%), the viscosity increased by 10%, which is less than the reported increase from other related studies on nanofluids 37 antifreeze-CoFe 2 O4/SiO 2 Experiment Vapour compression system Nano-refrigerant The nanofluids increased the performance of the system by 37.7% 38 graphene-acetone/ZnBr 2 Experiment Absorption refrigeration system Absorbent Nanoparticles improved boiling at lower temperatures 39 acetone/ZnBr 2 –ZnO Experiment Absorption refrigeration system Absorbent Acetone/ZnBr 2 nanofluid improved the performance of this fluid in the vapour absorption refrigeration system 40 Al 2 O 3 –POE oil Experiment Vapour compression system Nano-lubricant Improved the COP of the system by 17.27%, and energy consumption was reduced by 32.48% at 0.1 vol% Al 2 O 3 nanoparticles 41 CuO/water Numerical Solar absorption chiller Absorbent The application of the nanofluid enhanced the performance of the NH 3 –NaSCN and NH 3 –LiNO 3 systems by 2.70% and 1.50%, respectively 42 ...…”