Abstract
The use of hybrid nanofluids in direct-absorption solar collectors is an efficient approach to harnessing solar energy. To address current energy challenges, in this study new hybrid nanoparticle aggregates containing distinct silver-based and iron-oxide nanophases (Ag+Fe2O3) were used to improve the photothermal conversion characteristics of direct absorption solar collectors. The main goal of the study was to investigate the effect of hybrid nanoparticle concentration and the efficiency of hybrid nanofluids on solar energy absorption performance. Experimental results showed that increasing the temperature of the nanofluid is higher than that of the base fluid, which means that nanoparticles dispersed in water have a stronger absorption of solar energy. The results also indicated that the efficiency decreases as increases time or temperature because the heat loss through the top surface of the sample increases at higher temperatures.
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