Investigation on performance enhancement due to staggered piece in a broken arc rib roughened solar air heater duct

Gill, R.S.; Hans, V.S.; Saini, J.S.; Singh, Sukhmeet

doi:10.1016/j.renene.2016.12.002

Cited by 109 publications

(28 citation statements)

References 22 publications

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“…Experimental and numerical simulations using the CFD technique were carried out by Gill R.S, et al [5], and a broken arc-shaped rib collective with a staggered rib shape of a piece with the ratio of 12 was taken for analysis. Rib raggedness that was immovable with a staggered rib position of 0.4, roughness height of 0.043, gap size of 1.0, arc angle of 30 • , and gap location of 0.65 with a roughness pitch of 10mm was considered.…”

Section: A Broken Arc Rib (Bar)mentioning

confidence: 99%

“…Implementing passive techniques in an absorber plate by using irregular forms like ribs, grooves, baffles, winglets, and twisted tapes, increases the heat transfer enhancement in solar duct [1][2][3]. Numerous authors [4][5][6][7] have conducted analytical and experimental investigations implementing passive techniques in absorber plates that resulted in heat transfer enhancement. The main goal of this review paper is to provide information about the importance of a rib molded on: (a) Different shaped 3…”

Section: Introductionmentioning

confidence: 99%

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A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

et al. 2018

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In this paper, the effect of various shapes of ribs used in Solar Air Heaters (SAHs) was discussed. The review is concentrated on the geometry of the rib and its location on the SAH panel. Both numerical and experimental works were considered for discussion with dry air and Nano fluids as a working fluid. The influence of various shapes, such as an L shape, W shape, V shape, Multiple V shape, V shape with a gap, detachable & attachable ribs etc., was analyzed. The common fact observed from this analysis is that the implementation of artificial roughness in the absorber plate results in a considerable increase in the rate of heat transfer. Further, it is observed that ‘Multiple V-shaped with open between the ribs’ results in the maximum thermal enhancement when compared to the other shapes.

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Section: A Broken Arc Rib (Bar)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

et al. 2018

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“…Artificial roughness of various forms and geometrical shapes investigated by different researchers is reported in the literature. The use of rib roughness in numerous shapes and geometries, such as square, 88,90,[103][104][105] triangular, 92,95,106,107 rectangular, 106,107 inclined, 93 V-shaped, 89,108 W-shaped, 94 discrete, 93,94,109 chamfered, 88 wedge shaped, 107 arc shaped, 97,106,110,111 L shaped, 96 U shaped, 91 porous rib type roughness, 112 and pentagonal ribs 98 result a better performance compared to conventional-type solar air collector. Many of the investigators reported considerable enhancement in heat transfer with less penalty of friction by the application of…”

Section: Ribs and Groovesmentioning

confidence: 99%

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Chamarthi

Singh

2020

Intl J of Energy Research

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This review composition aimed to comprehensively present the experimental investigation procedures and thermal performance augmentation techniques of solar air heaters. Various testing standards such as static and dynamic tests, and performance parameters, such as, thermal, thermo-hydraulic, and exergy efficiencies, are incorporated to present the experimental investigation procedures. The present review work deals with testing conditions (indoor and outdoor), instrumentation, various parameters of interest with corresponding optimum values, their uncertainty levels together with SAH orientation, air flow type, thermal energy storage devices, duct modifications and heat transfer surfaces using fins, baffles, and ribs employed to enhance the thermal performance. The authors of this review work believed that the current composition constitutes a summary of details to quickly access the information for analyzing the various experimental investigation procedures and heat transfer augmentation techniques along with the optimum values of flow and geometric parameters. Moreover, economical and efficient solar air-heating systems with low pressure drop and high heat exchange to air are presented and reviewed.

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“…To conduct desired test with rib roughness, an indoor test setup is constructed according to ASHRAE [14]. The roughness geometry selected is broken arc rib with staggered elements having two identical gaps on either side of centre of absorber surface of solar collector illustrated in Fig.…”

Section: Rib Geometry and Selected Test Parametersmentioning

confidence: 99%

“…The heat transfer was observed 263% and 119% more than smooth and full arc roughness and friction was determined 2.44 and 1.14 times respectively at (P/e) as 10, (g/e) as 1, (d/W ) as 0.65, α as 30° and (e/Dh) as 0.043. Gill et al [14] modified Hans [13] geometry by introducing a staggered element in arc gap. They varied relative staggered rib size (r/g) from 1 to 6 for Reynolds number (Re) 2000-16000.…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation of Solar Collector Having Broken Arc Ribs Of Symmetrical Gap with Staggered Elements

Yadav*,

Lanjewar

2019

IJEAT

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To experimentally investigate the thermal behaviour of solar collector with broken arc artificial roughness of symmetrical gap and staggered element, a study is conducted with four number of absorber surface of hot rolled steel plate of dimensions 1500 mm x210 mm x1.2 mm (length x width x thickness). The test dimension of plate was 1500 mm x 200 mm (LxW). The test parameters were relative roughness pitch P/e as 8-14, relative roughness height e/Dh as 0.04545, number of gaps Ng as 2, relative gap width g/e as 1, relative staggered length r/e as 4.5, relative staggered pitch p’/p as 0.4 and Reynolds number 3000-15000. The highest Nusselt number recorded at staggered length 3.5 was 5 times smooth plate. The highest thermohydraulic performance was recorded 1.85 for the same value of relative staggered length.

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Investigation on performance enhancement due to staggered piece in a broken arc rib roughened solar air heater duct

Cited by 109 publications

References 22 publications

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

A Performance Evaluation of a Solar Air Heater Using Different Shaped Ribs Mounted on the Absorber Plate—A Review

A comprehensive review of experimental investigation procedures and thermal performance enhancement techniques of solar air heaters

Performance Evaluation of Solar Collector Having Broken Arc Ribs Of Symmetrical Gap with Staggered Elements

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