Thermal performance characterstics of artificially roughened and boosted solar air heaters

This paper represents the results on data collected under actual outdoor conditions for artificially roughened and smooth solar air heaters with and without booster mirrors. The results show that the effect of boosting of solar radiation is appreciable and consequently, the thermal efficiency of the roughened collectors with booster mirrors increases further over the roughened ones without any further increase in the pressure drop over that in the roughened ones. The values of the collector heat removal factor and collector efficiency factor of