Investigation for the optimal thermohydraulic performance of artificially roughened solar air heaters

Verma, Suresh Kant; Prasad, B.N.

doi:10.1016/s0960-1481(99)00081-6

Cited by 212 publications

(73 citation statements)

References 7 publications

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“…The convective heat transfer coefficient (h cabrof ) between roughened surface and fluid is estimated by the following correlation [26] (31) where Re is the Reynolds number, defined as…”

Section: Heat Transfer Coefficient and Pressure Dropmentioning

confidence: 99%

Energy and Exergy Analysis of Solar Air Heaters with Varied Geometries

Velmurugan

Kalaivanan

2015

Arab J Sci Eng

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An indoor standard test procedure is developed to experimentally investigate the steady state energy and exergy performance of single-pass flat plate solar air heater (SPF-PSAH), roughened plate dual-pass solar air heater (RPDP-SAH), finned plate dual-pass solar air heater (FPDPSAH) and wire mesh dual-pass solar air heater (WMDPSAH) at varied mass flow rates and solar intensities. The analytical solution of the energy balance equations for various elements of the SPFPSAH, RPDPSAH, FPDPSAH and WMDPSAH is determined using a MATLAB 8.1 program and correlated with experimental findings. The analytical and experimental results show that the energy and exergy performance of WMDPSAH is superior to FPDPSAH, RPDPSAH and SPF-PSAH. The pressure drop of WMDPSAH is higher than that of FPDPSAH, RPDPSAH and SPFPSAH. From the economic analysis, WMDPSAH is found economically viable within the opted conditions compared with FPDPSAH and RPDPSAH. The analytical and experimental results are in fairly good agreement.Keywords Wire mesh · Energy · Exergy · Solar air heater · Efficiency · Dual pass List of symbols A c Area of the collector (m 2 ) A f Total area of the fins (m 2 ) B Flow channel width (m) c p Specific heat of air (J/kg K) d w Wire diameter of wire mesh (m)

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“…The convective heat transfer coefficient (h cabrof ) between roughened surface and fluid is estimated by the following correlation [26] (31) where Re is the Reynolds number, defined as…”

Section: Heat Transfer Coefficient and Pressure Dropmentioning

confidence: 99%

Energy and Exergy Analysis of Solar Air Heaters with Varied Geometries

Velmurugan

Kalaivanan

2015

Arab J Sci Eng

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“…They reported the maximum enhancement in Stanton number for the Reynolds number of 12000. An outdoor experimental study on transverse roughness was performed by Verma and Prasad [4]. The optimum thermo hydraulic performance of 71 % was obtained corresponding to the roughness Reynolds number of 24.…”

Section: Introductionmentioning

confidence: 99%

Improved Thermal Performance of Solar Air Heater Using V-Rib with Symmetrical Gap and Staggered Rib

Jain¹

2017

IJERA

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The most efficient technique to increase the performance of solar air heater is to enhance the heat transfer by using artificial roughness in form of repeatedly used ribs on the absorbing heated absorber plate. In order to analyse the thermal performance and flow pattern of rectangular duct with aspect ratio (W/H) of 8, the present experimental investigation is performed with V-rib with Symmetrical Gap and Staggered Rib. The experiment has covered a Reynolds number (Re) range of 3000-14000, rib height 2 mm, pitch (P) 24mm, relative roughness pitch (P/e) of 12, gap width (g) 8mm, relative gap width (g/e) as 4 and angle of attack (α) 60 o , number of gaps on each sides of V-rib (Ng) 3, relative roughness height (e/Dh) 0.045, staggered rib pitch (P') 15.6mm, relative staggered rib pitch (P'/P) 0.65, staggered rib size (w) 20mm and relative staggered rib size (w/g) 2.5. Results have been compared with the smooth plate under similar flow condition to determine the enhancement in heat transfer and improvement in efficiency. Relative staggered rib pitch was kept at 0.65 and staggered rib size was kept as 2.5 times gap width.

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“…Han et al [9] seen the effect of artificial roughness on heat transfer and friction factor for two opposite roughened surfaces. Verma and Prasad [13] studied the effect of protruding wires on friction factor, heat transfer coefficient and plate efficiency factor of a solar air heater , Prasad and Saini [21] studied the effect of roughness and flow parameters such as relative roughness height (e/D) and relative roughness pitch (p/e) on heat transfer and friction factor. Sahu et al [15] experimentally investigated the heat transfer coefficient by using 900 broken transverse ribs on absorber plate of a solar air heater, Gupta et al [11] experimentally investigated the effect of relative roughness height (e/d), Aharwal et al [17] carried out result of inclination of rib with respect to flow direction and Reynolds number (Re) on the thermo hydraulic performance of a roughened solar air heater for transitionally rough flow region.…”

Section: Introductionmentioning

confidence: 99%

Enhancement of heat transfer of solar air heater roughened with circular transverse RIB

Singh¹,

Sidhu²

2014

International Advanced Research Journal in Science, Engineering

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An experimental investigation of the effect of geometrical parameters of circular transverse ribs on heat transfer of rectangular duct with heated plate having rib roughness on its underside have been reported. The range of parameters for this study has been decided on the basis of practical considerations of the system and operating conditions of solar air heaters. The experimental investigation encompassed the Reynolds number (Re) range from 2564 to 6206; relative roughness pitch (P/e) of 8, angle of attack (α) of 90° and relative roughness height (e/Dh) is 0.047. The thermal efficiency of roughened duct is observed to be 5%-9% more as compare to the smooth duct. The thermal efficiency is increased with increasing the value of Reynolds number.

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Investigation for the optimal thermohydraulic performance of artificially roughened solar air heaters

Cited by 212 publications

References 7 publications

Energy and Exergy Analysis of Solar Air Heaters with Varied Geometries

Energy and Exergy Analysis of Solar Air Heaters with Varied Geometries

Improved Thermal Performance of Solar Air Heater Using V-Rib with Symmetrical Gap and Staggered Rib

Enhancement of heat transfer of solar air heater roughened with circular transverse RIB

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