Abstract
Artificial roughness has been found to enhance the rate of heat transfer in solar air heater ducts. However, improvement in heat transfer enhancement is invariably accompanied by increased pumping power. Several investigators have investigated the effect of different types of roughness on solar air heaters on the basis of heat transfer and friction factor. This paper presents a comparison of effective efficiency of solar air heaters of various types of roughness geometries over the absorber plate. These geometries have been used by various investigators in order to increase the heat transfer and friction factor in solar air heaters. Based upon correlations developed by various investigators, effective efficiency is also compared for a set of roughness geometries within the investigated range of operating parameters. doi: 10.14456/WJST.2014.92
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