In this article, an experimental study was performed to assess the potential thermal\napplication of a new nanofluid comprising carbon nanoparticles dispersed in acetone inside an\nevacuated tube solar thermal collector. The effect of various parameters including the circulating\nvolumetric flow of the collector, mass fraction of the nanoparticles, the solar irradiance, the tilt angle\nand the filling ratio values of the heat pipes on the thermal performance of the solar collector was\ninvestigated. It was found that with an increase in the flow rate of the working fluid within the system,\nthe thermal efficiency of the system was improved. Additionally, the highest thermal performance\nand the highest temperature difference between the inlet and the outlet ports of the collector were\nachieved for the nanofluid at wt. % = 0.1. The best tilt angle and the filling ratio values of the collector\nwere 30Degree and 60% and the maximum thermal efficiency of the collector was 91% for a nanofluid at\nwt. % = 0.1 and flow rate of 3 L/min.
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