Performance evaluation of solar air heaters having v-down discrete rib roughness on the absorber plate

Karwa, Rajendra; Chauhan, Kalpana

doi:10.1016/j.energy.2009.10.007

Cited by 74 publications

(23 citation statements)

References 17 publications

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“…The formation of the thin boundary layer at the absorber plate surface commonly known as the viscous sub-layer is another reason of the low heat transfer rate. Remarkable efforts are made by Chaube et al [13], Sahu and Bhagoria [14], Jaurker et al [15], Karwa and Chauhan [16] and Karmare and Tikekar [17] to study the effect of rib roughness over the absorber plate on thermal performance of solar air heaters. They indicated that the artificial roughness breaks the viscous sub-layer and increases the heat transfer with the penalty of the undesirable increase in the pressure drop due to the increased friction.…”

Section: Introductionmentioning

confidence: 97%

Thermal performance investigation of double pass-finned plate solar air heater

et al. 2011

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Section: Introductionmentioning

confidence: 97%

Thermal performance investigation of double pass-finned plate solar air heater

et al. 2011

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“…The inclined and V-shaped wavy surfaces are selected due to the investigations from the Refs. (Promvonge et al (2011), Singh et al (2012, Hans et al (2011), Singh et al (2011), SriHarsha et al (2009, Karwa and Chauhan (2010), Tang and Zhu (2013), Peng et al (2011)). For a better understanding of the mechanisms in the tube heat exchanger, the numerical method is selected to solve the present problem.…”

Section: Frontiers In Heat and Mass Transfermentioning

confidence: 99%

Three-Dimensional Numerical Investigation on Laminar Forced Convection and Heat Transfer in a Circular Tube Inserted With Right Triangular Wavy Surfaces

Jedsadaratanachai¹,

Boonloi²

2017

Frontiers in Heat and Mass Transfer

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As the results, the wavy surface can generate the vortex flow and impinging flow through the test section that helps to improve the heat transfer rate and thermal performance. The impingement of the flow on the tube wall disturbs the thermal boundary layer that is an important factor to enhance the heat transfer rate. The V-Downstream wavy surface can create the highest strength of the impinging flow that leads to the highest heat transfer rate. In the range investigate, the augmentations are around 1.2 -7.6 and 4 -43.6 times above the smooth tube for the heat transfer and friction loss, respectively. In addition, the optimum thermal enhancement factor, TEF, is around 2.42 for the V-Downstream wavy surface at α = 30 o and Re = 2000.

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“…Karwa and Chauhan [19] have presented a detailed nonlinear mathematical model for a smooth duct solar air heater. The model calculates the useful heat gain from the iterative solution of basic heat transfer equations of top loss and equates the same with the convective heat transfer from the absorber plate to the air using proper heat transfer correlations for the smooth duct air heater.…”

Section: Mathematical Model For Performance Predictionmentioning

confidence: 99%

“…Their values are also given in a tabular form. The effective thermal efficiency takes account of pumping power and is defined as [19] …”

Section: Performance Prediction Of Baffled Duct Air Heatermentioning

confidence: 99%

Performance Study of Solar Air Heater Having Absorber Plate with Half-Perforated Baffles

Maheshwari

Karwa

Gharai

2011

ISRN Renewable Energy

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The paper presents a detailed mathematical model for performance prediction of a smooth duct solar air heater validated against the experimental results. Experimental study on a solar air heater having absorber plate with half-perforated baffles on the air flow side shows thermal efficiency enhancement of 28%-45% over that of the smooth duct solar air heater, which is attributed to the heat transfer enhancement (of the order of 180%-235%) due to the perforated baffles attached to the absorber plate and reduction in the mean temperature of the absorber plate by 20• C-25• C as compared to the temperature of absorber plate of smooth duct air heater. Using the mathematical model, the performance plot for the baffled duct air heater has been presented, and the effect of the variation of ambient parameters on the predicted thermal efficiency has been studied.

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Performance evaluation of solar air heaters having v-down discrete rib roughness on the absorber plate

Cited by 74 publications

References 17 publications

Thermal performance investigation of double pass-finned plate solar air heater

Thermal performance investigation of double pass-finned plate solar air heater

Three-Dimensional Numerical Investigation on Laminar Forced Convection and Heat Transfer in a Circular Tube Inserted With Right Triangular Wavy Surfaces

Performance Study of Solar Air Heater Having Absorber Plate with Half-Perforated Baffles

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