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Commenced in January 2007 Frequency: Monthly Edition: International Publications Count: 29414

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Performance of Single Pass Down Stream Solar Air Collector with Inclined Multiple V-Ribs
Solar air heater is a type of heat exchanger which transforms solar radiation into heat energy. The thermal performance of conventional solar air heater has been found to be poor because of the low convective heat transfer coefficient from the absorber plate to the air. It is attributed to the formation of a very thin boundary layer at the absorber plate surface commonly known as viscous sub-layer. Thermal efficiency of solar air heater can be improved by providing the artificial roughness on absorber plate is the most efficient technique. In this paper an attempt is made to provide artificial roughness by incorporating inclined multiple V-ribs in the underside of the absorber plate. 60˚V – ribs are arranged inclined to the direction of air flow. Performance of collector estimated theoretically and experimentally. Results of the investigation reveal that thermal efficiency of collector with multiple V-ribs increased by 14%.
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[1] ASHRAE standard 93-77. Method of testing to determine the thermal performance of solar collector; 1977.
[2] Akpinar E.K., Koçyigit F., “Experimental investigation of thermal performance of solar air heater having different obstacles on absorber plates”, Int Commun Heat Mass, 37(4), pp.416–21, 2010.
[3] Bhagoria J.L, Saini J.S, Solanki S.C., “Heat transfer coefficient and friction factor correlations for rectangular solar air heater duct having transverse wedge shaped rib roughness on the absorber plate” Renewable Energy 25 341–369, 2002.
[4] Ebru Kavak Akpinar, Fatih Kocyigit, “Experimental investigation on solar air heater having different obstacles on absorber plates”, International Communications in Heat and Mass Transfer, 37 416-421, 2010.
[5] El-Sawi A.M., Wifi A.S., Younan M.Y., Elsayed E.A., Basily B.B., “ Application of folded sheet metal in flat bed solar air collectors” Applied Thermal Engineering 30 864–871, 2010.
[6] El-Sebaii A.A., Aboul-Enein S., Ramadan M.R.I., Shalaby S.M., Moharramb B.M., “Investigation of thermal performance of-double pass-flat and v-corrugated plate solar air heaters”, Energy 36 1076-1086, 2011.
[7] Hikmet Esen, “Experimental energy and exergy analysis of double flow solar air heater having different obstacles on absorber plates”, Building and Environment 43 1046-1054, 2008.
[8] Hans V.S., Saini R.P., Saini J.S., “Heat transfer and friction factor correlations for a solar air heater duct roughened artificially with multiple v-ribs” Solar Energy 84 898–911, 2010.
[9] Jaurker A.R., Saini J.S., Gandhi B.K., “Heat transfer and friction characteristics of rectangular solar air heater duct using rib-grooved artificial roughness”, Solar Energy 80 895–907, 2006.
[10] Kamali R., and Binesh A.R., “The importance of rib shape effects on the local heat transfer and flow friction characteristics of square ducts with ribbed internal surfaces” International Communications in Heat and Mass Transfer 35 1032-1040, 2008.
[11] Karsli S., “Performance analysis of new-design solar air collectors for drying applications” Renewable Energy, 32(10), pp.1645–60, 2007.
[12] Lanjewar A.M., Bhagoria J.L., and Sarviya R.M., “Thermohydraulic performance of solar air collector using w-shaped artificial roughness”, Journal of Environmental Research and Development Vol. 6 No. 3A, 2012.
[13] Momin A-M.E., Saini J.S., Solanki S.C., “Heat transfer and friction in solar air heater duct with Vshaped rib roughness on absorber plate”, International J. of Heat and Mass Transfer, 45(16), 3383-3396, 2001.
[14] Romdhane B.S.,”The air solar collectors: Comparative study, Introduction of baffles to favor the heat transfer”, Solar Energy, 81(1), pp.139–149, 2007.
[15] Rajendra Karwa, Girish Chitoshiya, “Performance study of solar air heater having v-down discrete ribs on absorber plate”, Energy 55 939- 955, 2013.
[16] Suman Saurav, Sahu M.M., “Heat Transfer and Thermal Efficiency of Solar Air Heater Having Artificial Roughness A Review”, .International journal of renewable energy research, Vol. 3, No. 3, 2013.
[17] Sukhmeet Singh, Subhash Chander, Saini J.S, “Heat transfer and friction factor of discrete V-down rib roughened solar air heater ducts”, Journal of Renewable Sustainable Energy 3(1):013108e17, 2011.
[18] Sukhmeet Singh, Subhash Chandera, Saini. J.S., “Heat transfer and friction factor correlations of solar air heater ducts artificially roughened with discrete V-down ribs”, Energy 36 5053-5054, 2011.
[19] Varun, Saini R.P, Singal S.K, “Investigation of thermal performance of solar air heater having roughness elements as a combination of inclined and transverse ribs on the absorber plate”, Renewable Energy 33 1398- 1405, 2008.
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