Analysis of Solar Air Heater with different Shaped Roughened Absorber Plate

Thermal Engineering

In an analytical methodology a trails have been conducted on the heat transfer and friction factor for a solar air heater duct with continuously discrete rib of circular cross-sectional ribs without symmetric gaps. In this experimental investigation, it was assured that the height is 2mm, the pitch (p) of the ribs is 20, the relative roughness pitch (p/e) is 10mm. When the observations were compared between smooth absorber plates. The smooth ribs couldn’t transfer the desired heat and so it was not practically prepared. The rough ribs having symmetrical gaps were efficient enough to transfer heat but it is not economical and has a huge complexity in design, whereas the continuous discrete ribs without symmetric gaps overcome this problem. The result of continuous discrete ribs was concluded by comparing Nusselt number and Friction factor with circular ribs having symmetric gaps. The rough ribs were efficient enough to transfer the desired heat, but they are not economical and are very complex in design and construction. Whereas, the Circular ribs gives more area of contact. So, there is enough time to transfer the heat from the ribs to the passing air which touches the ribs and the heat transfer takes place efficiently.

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