Abstract
A coating on the roughened absorber surface of a solar air heater can improve its efficacy. This paper presents the results of a comparative study of nanomaterial and hybrid nanomaterial coatings on the roughened absorber surface to improve the performance of a solar air heater. The solar heater is designed to assess heat transfer rate, thermal efficiency, exergy efficiency and entropy production. To improve heat absorption, roughened absorber plates were covered with graphene and graphene/cerium oxide -black paint doped into black paint in the quantity of 1% nanomaterial. For constant air mass flow rates of 0.019 kg/s, the results are displayed. When the solar intensity is between 700 and 1250 W/m2, the thermal and exergy efficiency of the graphene/cerium oxide -black paint coating on the SAH roughened absorber plate is 3.36 % and 0.54 % respectively, greater than that of a graphene-black paint coating. For graphene-black paint, entropy generation is larger, whereas for1 % graphene/cerium oxide -black paint, it is lower.
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