An experimental investigation on the effect of hybrid Nano fluid (Al+Al2O3/distilled water) on the thermal efficiency of evacuated tube solar collector

Abstract

The objective of this research is to explore experimentally the impact of using (Al+Al2O3/distilled water hybrid Nano fluid) as the working fluid on the thermal efficiency of the evacuated tube solar collector with inner cylindrical coil within the vertical tank. The nanoparticles volume fraction was 1,3 and 5 % with the( 50 nm) dimension of nanoparticles. The performance of the evacuated tube solar collector (ETSC) utilizing (Al+Al2O3) hybrid Nano fluid and water was compared to the flow rate within the coil ranged from 15, 30 and 45 l/h.rm2. The results of the current research showed that the highest effectiveness of the solar collector 24.89% for mass flow rate of Nano fluid 45 l/hr.m2 and nanoparticles volume fraction of 5% vol. Findings show that (Al+ Al2O3) hybrid nanofluids could be utilized in an ETSC as working liquids to absorb heat from solar radiation and effectively transform solar energy into thermal energy.