This research investigated the impact of the nanoparticles (Cu/DW) on the characteristics of a solar vacuum collector, as Nano fluids are distinguished by their high thermal conductivity. The Cu nanoparticles’ diameter was 40 nm, and three distinct volume fractions of 1,3% and 5% vol nanoparticles were investigated at flow rates of 30, 50, and 60L/min. The experiments were done at the city of Baghdad, Iraq, at longitude 44° 14′ East and latitude 33° 33′ North. The results show that a volumetric fraction of 5 vol% nanoparticles at a flow rate of 60 L/min produces the most usable heat gain. The findings recorded that adding other nanoparticles enhanced the thermic efficiency of the evacuated solar tube. Compared to pure water’s efficiency and thermal performance, Nano fluid exhibits much higher levels of other. A solar vacuum collector’s capacity to boost its heat transfer rate and its thermal efficiency is directly related to the size and kind of nanoparticles utilized in the process. Because of the higher nanoparticle concentration, a larger heat was captured, which may be put to various beneficial uses. Including Cu nanoparticles in the working fluid will increase the temperature of the fluid. The temperature difference between the intake and the output was greater as the volume percentage of copper nanoparticles rose compared to the volume of distilled water. The granular size and its type are important in improving heat transfer. The thermal properties of Nano fluids are better than distilled water, except for the specific heat capacity, because the fluid needs more heat than the Nano fluid.

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