Computational Investigation of Thermal Performance of Solar Air Heater Having Roughness Elements as a Bend on the Absorber Plate
Keywords:
solar energy, heat transfer, relative roughness pitch, thermal efficiencyAbstract
An Analytical investigation has been carried out to study the heat transfer and friction characteristics by using a bend roughness on the absorber plate of a solar air heater. The Analytical investigation consist the Reynolds number (Re) ranges from 18000 to 50000, relative roughness pitch (p/h) is 0.5-3 and relative roughness (p/Db) 4.29-12.The effect of these parameters on the heat transfer coefficient and friction factor has been discussed in the present report and correlations for Nusselt number and friction factor has been developed within above limits. A procedure to compute the thermal efficiency based on heat transfer processes in the system is also given and the effect of these parameters on thermal efficiency has been discussed. Bend as roughness elements have been used to enhance heat transfer coefficient. By providing artificial roughness it has been concluded that there is an improvement of heat transfer and temperature enhancement.
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