Performance Appraisal of the Mono and binary nanofluids in the solar Collectors through Energetic and Exergetic

Authors

  • Khalid F. Sultan, Hosham S. Anead

Abstract

The most suitable means of improving the performance of heat transfer devices are nanofluids. The nanofluid consisted of working fluid with nanoparticles. The study includes metal (Al) and oxide metal (CuO, Al2O3) as suspensions, also distilled water as the working liquid. Various types of hybrid suspensions were used because they have high thermal connectivity such as (CuO+Al2O3). Diameter of nanoparticles was (30nm) for (Al) and (50nm) for (CuO+Al2O3). Three different volume concentrations of nanoparticles have been used for studies (2%, 4% and 6% vol. solar collectors’ thermal efficiency was tested at different flow rates (20, 30 and 40 Lit/hr m2). Experimental findings indicated that the improvement percentages of (Al) with working fluid are (13.28%, 19.52% and 25.18 %) while these percentages of (CuO+ Al2O3) with working fluid are (3.906 % , 5.34% and 7.407%). The rates of improvement of the first mixture are higher than the rates of improvement of the second mixture. Increased rates of improvement are due to thermal properties and hybrid nanoparticles size for the first type better than second type at different flow rate and concentration. Parameters (synergistic effect, kind and size nanoparticles are representing an important function to promote heat transfer rate. The solar collector's performance could be improved by the nanofluid's high thermal conduction, Contradictory from the use alone of the working fluid. The exergy in flow, exergy destruction and exergy efficiency of nanofluid (Al + distilled water) are greater than nanofluid ((CuO+ Al2O3) + distilled water) and distilled water. The exergy inflow, exergy destruction, and exergy efficiency for the two types of nanofluids increase with increasing concentration of nanoparticles. The region below’ the curve as a factor has been used to article a impact of levels of flow, concentrations, type and size of nanoparticles on the overall effectiveness of the collector.

Keywords – Solar collector, Performance, Hybrid nanofluids, Solar collector efficiency

Published

2020-12-31

Issue

Section

Articles