Performance analysis of W-shaped rib roughened solar air heater

Lanjewar, Atul; Bhagoria, J.L.; Sarviya, R. M.

doi:10.1063/1.3595740

Cited by 29 publications

(6 citation statements)

References 17 publications

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“…Similarly, Kumar et al [83] and Mittal et al [216] showed how exergetic efficiency (η exg ) varies with Re and ∆T/I. The design plots for artificially roughened SAH duct parameters, as shown in Figures 47 and 48, were provided by investigators [199,209,216] compared for different SAH ( [20,41,143,147,160,163,181]). These design graphs reveal the roughness parameter's optimal values.…”

Section: Thermo-hydraulic Performance Of Artificially Roughened Sahmentioning

confidence: 98%

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Recent Developments and Advancements in Solar Air Heaters: A Detailed Review

et al. 2022

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The scientific literature extensively mentions the use of a solar air heater (SAH) by utilizing solar energy for heating purposes. The poor heat-transfer rate of an SAH with a flat plate is caused by developing a laminar sub-layer near the heated base plate. The plate temperatures improve significantly, resulting in losses and a decrease in performance. The passive approach entails the placement of fins/turbulators/pouring material/ribs to the surface where the boundary layer forms to disrupt it. Artificially roughened SAH for gathering and efficiently using solar radiations for thermal purposes is extensively described in the literature. This paper includes a thorough literature overview of the history, basics, roughness evolution, forms of SAH, and recent breakthroughs in thermal performance improvement techniques for SAH compiled by several researchers. This paper uses a comparative evaluation of several roughness geometries and kinds of SAH to uncover thermohydraulic performance factors that may be considered in future research to pick the optimal configuration.

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Section: Thermo-hydraulic Performance Of Artificially Roughened Sahmentioning

confidence: 98%

“…2022, Elsevier. (b) η exg vs. Re for different SAH ([20,41,147,160,163,181]); reprinted with the permission from ref [156],. 2022, Elsevier.…”

mentioning

confidence: 99%

Recent Developments and Advancements in Solar Air Heaters: A Detailed Review

et al. 2022

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“…Lanjewar et al [44] done an experiment to study the thermo-hydraulic performance of SAH using W-shaped ribs on absorber plate. W-shaped ribs have been investigated under downstream and upstream condition.…”

Section: W Shaped Ribsmentioning

confidence: 99%

Factors influencing the performance of solar air heater (SAH) having artificial coarseness: a review

Bharadwaj

Sharma

Mausam

2021

Journal of Thermal Engineering

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A review of studies focused on promoting the rate of heat transfer with the help of an optimum rise in friction factor, by offering a simulated irregularity to the interior surface of the absorber plate of SAH, is expressed. In this article an effort has been made to explore different coarseness configurations as used by number of researchers to boost the SAH heat transfer rate. Furthermore, different correlations developed by researchers for Nusselt number and friction factor are also presented. On the basis of these correlations, thermohydraulic performance variable was calculated and attributed for various coarseness configurations. Friction factor and Colburn factor of various coarseness configurations have also been com-pared and presented. This review focused on use of different coarseness configurations with different coarseness parameter and flow parameter is deeply discussed from which future researchers can easily identify that which coarseness is to be used for designing SAH duct for the better augmentation of heat transfer and friction factor. It also helps the researchers to determine the optimum value of coarseness parameter so that the SAH works efficiently and effectively.

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“…The authors have studied much research to understand the physics behind rib turbulators and flow regimes. It is found that few of the researchers accomplished their exertion on the roughness geometry of arc shape, 13 square ribs, 14 broken arc, 15 continuous W‐shaped, 16 discrete W‐ribs, 17 winglet shape, 18 Delta winglet, 19 chamfered grooved type, 20 conical shape, 21 and S‐shaped 22 which have improved the thermal performance of SPAH. Many of the investigators also executed their research work in V‐shaped rib roughness so that more generation of secondary flow could be assessed to augment the desired heat transfer rate and thermal efficiency rate.…”

Section: Introductionmentioning

confidence: 99%

Experimental study for the enhancement of heat transfer characteristics and development of thermal correlations of a roughened solar collector

Kumar,

Layek

2024

Heat Trans

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The thermal performance of the flat plate solar collector is very low. The most beneficial and worthwhile method for increasing the thermal performance of a solar‐powered air heater (SPAH) is to include a roughness element in the working zone of heat transfer that is located beneath the shear layer of the absorber surface. In this research work, efforts are made to enhance thermal performance and develop thermal correlations for the estimation of the Nusselt number and friction factor of a roughened SPAH. Experiments are performed for various ranges of flow, Reynolds numbers, and roughness parameters. The experimental technique of liquid crystal thermography is utilized to assess the dispersal of Nusselt number over the roughened surface for all roughness parameters. A maximum thermal performance enhancement index of 2.69 is obtained with the optimum value of the roughness parameter at a relative roughness pitch (RRP) of 9, a relative staggering distance (RSD) of 4, and a relative roughness length (RRL) of 6.15. Second, a mathematical correlation is developed using a regression model to estimate the Nusselt number and friction factor in terms of nondimensional roughness and flow parameters operated as RRP, RSD, RRL, and Re. The degree of discrepancy between the established the relationships and the findings from the experiment reveals incredibly satisfying results. Hence employing twisted V‐ribs as an artificial roughness element no doubt increases the Nusselt number, and thermohydraulic performance enhancement index, but it also exerts less frictional power across the SPAH duct.

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Performance analysis of W-shaped rib roughened solar air heater

Cited by 29 publications

References 17 publications

Recent Developments and Advancements in Solar Air Heaters: A Detailed Review

Recent Developments and Advancements in Solar Air Heaters: A Detailed Review

Factors influencing the performance of solar air heater (SAH) having artificial coarseness: a review

Experimental study for the enhancement of heat transfer characteristics and development of thermal correlations of a roughened solar collector

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