Performance analysis of solar air heater duct roughened with multigap V-down ribs combined with staggered ribs

Deo, Narinderpal Singh; Chander, Subhash; Saini, J.S.

doi:10.1016/j.renene.2016.01.067

Cited by 165 publications

(40 citation statements)

References 32 publications

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“…The results of attaching pin fins to the absorber plate of SAH indicate that the efficiency improves by 48% compared to SAH without fins [15]. Deo et al [16] studied the performance of a SAH with multigap V-down rib combined with staggered ribs. Hans et al [17] used multiple V-rib roughnesses in their design.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of the Slit Spacing and Bed Height on the Thermal Performance of Slit-Glazed Solar Air Heater

Mousavi

Egelioğlu

2017

International Journal of Photoenergy

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The thermal performances of three slit-glazed solar air heaters (SGSAHs) were investigated experimentally. Three SGSAHs with different bed heights (7 cm, 5 cm, and 3 cm) were fabricated with multiple glass panes used for glazing. The length, width, and thickness of each pane were 154 cm, 6 cm, and 0.4 cm, respectively. Ambient air was continuously withdrawn through the gaps between the glass panes by fans. The experiments were conducted for four different gap distances between the glass panes (0.5 mm, 1 mm, 2 mm, and 3 mm) and the air mass flow rate was varied between 0.014 kg/s and 0.057 kg/s. The effects of air mass flux on the outlet temperature and thermal efficiency were studied. For the SGSAH with bed height of 7 cm and glass pane gap distance of 0.5 mm, the highest efficiency was obtained as 82% at a mass flow rate of 0.057 kg/s and the air temperature difference between the inlet and the outlet (ΔT) was maximum (27°C) when the mass flow rate was least. The results demonstrate that for lower mass flow rates and larger gaps, the performance of SGSAH with a bed height of 3 cm was better compared to that of others. However, for higher mass flow rates, the SGSAH with 7 cm bed height performed better.

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Section: Introductionmentioning

confidence: 99%

Experimental Study of the Slit Spacing and Bed Height on the Thermal Performance of Slit-Glazed Solar Air Heater

Mousavi

Egelioğlu

2017

International Journal of Photoenergy

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“…Roughness pattern was created by fixing V shaped circular Aluminum wires with an adhesive to the absorber plate followed by the cutting of gaps and fixing of staggered ribs. Values of P/e, e/D h and (α) were selected based upon their optimization in our previous study (Deo et al (2016)), whereas values of (w/e) and (p/P) were estimated based upon the data available in the literature (Mulluwork, 2000;Patil et al, 2012). …”

Section: Details Of Roughness Geometriesmentioning

confidence: 99%

“…Patil et al (2012) experimented with a variation of the V-rib with one gap geometry by fixing a staggered rib piece in front of each gap and reported improvement in heat transfer and thermohydraulic performance. Deo et al (2016) studied the effect of relative roughness pitch, angle of attack and relative roughness height on the performance of multigap Vdown rib combined with staggered ribs roughness and reported improvement in thermohydraulic performance as compared to the V-down rib with gap (Singh et al (2011)) and broken V-rib roughness combined with staggered ribs (Patil et al (2012)) geometries.…”

Section: Introductionmentioning

confidence: 99%

Effect of Alterations in V-down Rib on the Performance of an Artificially Roughened Solar Air Heater Duct

Deo¹,

Chander

Saini³

2016

AJHMT

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The present study is focused on the selection of a rib roughness geometry having best thermohydraulic performance among various alternatives of the V-down type configuration. The continuous V-down (type I) rib roughness pattern along with its four alternatives viz. V-down rib with two gaps (type II), V-down rib with two gaps combined with staggered ribs (type III), V-down rib with four gaps (type IV) and V-down rib with four gaps combined with staggered ribs (type V) were evaluated by calculating the Nusselt number, friction factor and thermohydraulic performance parameter values. All roughness patterns were applied on one broad wall of a high aspect ratio (12:1) solar air heater duct and data was collected by varying Reynolds number from 4000 to 12000 (5 levels) during the testing of each absorber plate. Present study used fixed values of pitch-to-rib height (P/e) ratio of 12, rib height-to-hydraulic diameter (e/D h ) ratio of 0.044, angle of attack (α) of 60°, staggered rib length to height ratio (w/e) of 4.5 and relative staggered rib pitch (p/P) of 0.65. Results revealed that, thermohydraulic performance of type II, III and V were superior as compared to the type I by 8.2-13.8%, 13.7-20.4% and 34.6-54.5% respectively, whereas the thermohydraulic performance of type IV was inferior to the type I by 1.5-14.9% for the range of Reynolds numbers evaluated.

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“…They pointed out that the maximum thermal performance is around 2.43. Deo et al [6] reported performance analysis of a solar air heater duct roughened with multigap V-down ribs combined with staggered ribs. They showed that the maximum augmentations of the Nusselt number and thermal performance are around 3.34 and 2.45 times, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effect of Flow Attack Angle for V-Wavy Plate on Flow and Heat Transfer in a Square Channel Heat Exchanger

Boonloi

Jedsadaratanachai

2018

Journal of Engineering

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Effects of flow attack angles of the V-wavy plate on flow and heat transfer in a square channel heat exchanger are investigated numerically. The V-wavy plates with V-tips pointing downstream and upstream called V-Downstream and V-Upstream, respectively, are examined for the Reynolds number in the range of 3000-10,000. The finite volume method with SIMPLE algorithm is selected to solve the present problem. The numerical results are presented in terms of flow and heat transfer visualization. The thermal performance analysis is also concluded in the form of Nusselt number ratio (Nu/Nu 0 ), friction factor ratio ( / 0 ), and thermal enhancement factor (TEF). The numerical result shows that the wavy plate can induce the swirling flow through the test section for all cases. The swirling flow disturbs the thermal boundary layer on the channel wall which is the reason for heat transfer enhancement. In range studies, the heat transfer rate increases around 3-6.5 and 2.8-6 times above the smooth channel for VDownstream and V-Upstream, respectively. The optimum TEF is found at = 20 ∘ and Re = 3000 to be around 2.09 for V-Upstream case.

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Performance analysis of solar air heater duct roughened with multigap V-down ribs combined with staggered ribs

Cited by 165 publications

References 32 publications

Experimental Study of the Slit Spacing and Bed Height on the Thermal Performance of Slit-Glazed Solar Air Heater

Experimental Study of the Slit Spacing and Bed Height on the Thermal Performance of Slit-Glazed Solar Air Heater

Effect of Alterations in V-down Rib on the Performance of an Artificially Roughened Solar Air Heater Duct

Effect of Flow Attack Angle for V-Wavy Plate on Flow and Heat Transfer in a Square Channel Heat Exchanger

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