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Investigating The Parameters For The Performance Enhancement Of A Solar Air Heater Having Different Artificially Roughened Geometries
[Full Text]
AUTHOR(S)
Akshit Goyal, Sanjay Sharma, Milap Singh
KEYWORDS
Key words: Artificial roughness, Fluid flow, solar air heaters.
ABSTRACT
Abstract: The use of an artificial roughness on a surface of absorber plate is an effective technique to enhance the rate of heat transfer to fluid flow in the duct of a solar air heater. This paper presents a comparison of parameters that enhance the heat transfer coefficient thus efficiency ofa solar air heater for different artificially roughened geometries for the Reynolds number from 2500 -18000. The V-rib gives better results in whole range of Reynolds number than wedge shaped rib. While the arc shaped rib gives better performance in whole range of Reynolds number. However, smooth duct found suitable than the wedge and V shaped ribs for the lower range of Reynolds number.
REFERENCES
[1]. Bhagoria JL, Saini JS, Solanki SC. 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 2002; 25(3); 341-369
[2]. Prasad K, Mullick SC, Heat transfer characteristics of a solar air heater used for drying purpose. Appl Energy 1985; 12; 83-93
[3]. Webb RL. Heat transfer and friction in tubes with repeated rib roughness. International Journal Heat Mass Transfer 1971; 14; 601- 617
[4]. Prasad BN, Saini JS. Effect of artificial roughness on heat transfer and friction factor in solar air heater. Solar Energy 1988; 41; 555-560
[5]. Varun, Saini RP, Singal SK. A review on roughness geometry used in solar air heater. Solar Energy 2007, 81(11), 1340-1350
[6]. Nikuradse J. Laws of flow in rough pipes. NACA, Technical memorandum 1292, November 1950
[7]. Nunner W. Heat transfer and pressure drop in rough tubes. VDI Forch 445-B 5-39 (1956); AERE Lib Transactions, Vol. 786, 1958
[8]. Dippery DF, Sabersky RH. Heat and momentum transfer in smooth and rough tubes at various prandlt numbers. International Journal of Heat and Mass Transfer 1963; 6; 329-353
[9]. Han JC, Zhang YM. High performance heat transfer ducts with parallel, broken and V- shaped broken ribs. International Journal of Heat and Mass Transfer 1992; 35(2); 513-523
[10]. Lau SC, Kukraja RT, McMillin RD. Effect of V shaped rib arrays on turbulent heat transfer and friction of fully developed flow in a square channel. International Journal of Heat and Mass Transfer 1991; 34; 1605-1616
[11]. Taslim ME, Li T, Kercher DM. Experimental heat transfer and friction in channels roughened with angled V shaped and discrete ribs on two opposite walls ASME J Tubomach 1996; 118; 20-28
[12]. Ichimiya K, Katayama M, Miyazawa T, Kondoh H. Experimental study on effects of a single porous type roughness element in a parallel plate duct. Exp Heat transfer 1991; 4; 319-330
[13]. Ravigururajan TS, Bergles AE. General correlation for pressure drop and heat transfer for single phase turbulent flow in internally ribbed tubes: augmentation of heat transfer in energy systems, HTD 52, New York ASME; 1985. pp: 9-20
[14]. Liou TM, Hwang JJ. Developing heat transfer and friction in rectangular ribbed duct with flow separation at inlet. ASME J Heat Transfer 1992; 114; 565-573
[15]. Momin AME, Saini JS, Solanki SC. Heat transfer and friction in solar air heater duct with V shaped rib on absorber plate. International Journal of Heat and Mass Transfer 2002; 45; 3383-3396
[16]. Saini RP, Saini JS. Heat transfer and friction factor correlations for artificially roughened ducts with expanded metal mesh as roughened element International Journal of Heat and Mass Transfer 1197; 40; 973-986
[17]. Saini SK, Saini RP. Development for correlation of nusselt number and friction factor for solar air heater with roughened duct having arc shaped wire as artificial roughness. Solar Energy 2008; 82; 1118-1130
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