Proceedings of the 2nd International Conference on advances in Steel, Power and Construction Technology (ICASPCT-2016) 17-19 March, 2016, Raigarh, India Paper No. 81 ENHANCEMENT OF COLLECTOR PERFORMANCE PARAMETERS IN THREE SIDES ARTIFICIALLY ROUGHENED SOLAR AIR HEATER Ashwini Kumar Research Scholar Department of Mechanical Engineering, N.I.T., Jamshedpur-831014, India email- aknitjsr08@gmail.com Mob.- +91-9905343998 KDP Singh Associate Professor Department of Mechanical Engineering, N.I.T., Jamshedpur-831014, India B. N. Prasad Professor Department of Mechanical Engineering, N.I.T., Jamshedpur-831014, India Abstract Solar air heaters having artificially roughened absorber plate have been found to have higher heat transfer coefficient as compared to that of a solar air heater having a smooth (plane) absorber plate. A novel solar air heater with three artificially roughened absorber plates has been analyzed which result in more increase in heat transfer than that in only one side roughened solar air heaters. Optimal thermo hydraulic performance of one side roughened solar air heaters has been analyzed and investigated for the maximum heat transfer and the minimum pumping power (friction factor). The present paper deals with the results on collector performance parameters in three sides artificially roughened solar air heater with three sides glass covers. Results on the collector performance parameters, generally written as    and   , have been worked out with the help of the experimental data collected. The values of the collector heat removal factor,   and plate efficiency factor,  ′ , have been obtained, which have been enhanced in the range of 18 to 31 % and 20 to 25% respectively, as compared to one side roughened solar air heater and 51 to 60% and 41 to 49% respectively, as compared to smooth solar air heater, within the range of the parameters investigated. Keywords: - Collector roughness and flow parameters, Collector performance parameters, Heat removal factor, Plate efficiency factor, Collector thermal efficiency. Nomenclature:- C p specific heat at constant pressure of air, kJ/kgK  hydraulic diameter of solar air heater duct, m e artificial roughness height, m / relative roughness height  ′ collector efficiency factor   collector heat removal factor  0 collector heat removal factor based on outlet temperature,  0  mass flow rate per unit collector area, Kg/sm 2  collector length, mm  mass flow rate of air, Kg/s  roughness pitch, mm / relative roughness pitch  Reynolds number   ambient air temperature, 0 C   inlet temperature of air, 0 C  0 outlet temperature of air, 0 C  Transmittance-absorptance product ƞ  collector thermal efficiency  solar air heater duct width, m