Experimental study of thermal performance and pressure drop on a solar air heater with different orientations of arc-shape rib roughness

Sahu, Mukesh Kumar; Matheswaran, M.M.; Bishnoi, Pardeep

doi:10.1007/s10973-020-09569-z

Cited by 27 publications

(20 citation statements)

References 33 publications

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“…6.6. Arc-shape ribs 45,[55][56][57][58][59][60] are quite similar in working as V-shape ribs and also similar variation in its configurations. Hostile V-shape, arc shaped provides variable and continuous slope to secondary flow and vortices.…”

Section: Discussion and Future Scopementioning

confidence: 99%

“…Experimental set-up with all components for an outdoor test. Source: reproduced with permission from Sahu et al, 2020 45.…”

mentioning

confidence: 99%

“…Experimental set-up with all components for an outdoor test. Source: reproduced with permission from Sahu et al, 2020 45. For the above stated reasons, transient test methods have been developed, which involves the monitoring of collector performance for radiation and incident angle conditions.…”

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confidence: 99%

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A detailed review on research, technology, configurations and application of wire ribs as artificial roughness in rectangular solar air heater duct

Sahu¹,

Priyam

Mishra³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

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Use of artificial roughness in the duct of solar air heater (SAH) has been an interesting area of research during the last few decades. In present review article a holistic view about application of circular shape wire ribs as roughness element and its different geometry on the absorber plate of SAH duct for performance enhancement has been done. This article, reported in details numerous experimental as well as analytical studies for rib roughened SAHs which have been carried out by different researchers positively. Correlations for heat transfer and friction factor, developed by various investigators for different artificially roughened solar air heaters (SAHs) geometry have been reported in chronological order and in well tabulated form. The roughness and operating parameters into which investigators have obtained their maximum performances of SAHs have also been presented separately in the table. Effects of various rib roughness parameters on heat transfer and fluid flow process are also discussed in details.

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Section: Discussion and Future Scopementioning

confidence: 99%

“…Experimental set-up with all components for an outdoor test. Source: reproduced with permission from Sahu et al, 2020 45.…”

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confidence: 99%

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A detailed review on research, technology, configurations and application of wire ribs as artificial roughness in rectangular solar air heater duct

Sahu¹,

Priyam

Mishra³

et al. 2021

Proceedings of the Institution of Mechanical Engineers, Part E:

Self Cite

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“…Many engineering applications, such as chemicals production, refrigeration, car production, and solar air heaters, require a high-performance heat exchanger (HE) to efficiently utilize energy sources, so to achieve advantageous heat exchange with a limited cost [1][2][3][4][5][6]. Thus, several technologies have been studied in the last years to increase the rate of heat transfer (HT) from a tube.…”

Section: Introductionmentioning

confidence: 99%

Augmentation of Heat Transfer in a Circular Channel with Inline and Staggered Baffles

Nuwairan

Souayeh

2021

Energies

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This numerical investigation presents the effects of the position of baffles in the shape of a circle’s segment placed inside a circular channel to improve the thermal and flow performance of a solar air heater. Three different baffles’ positions with Reynolds number varying between 10,000 to 50,000 were investigated computationally. The k-omega SST model was used for solving the governing equations. Air was taken as the working fluid. Three pitch ratios (Y = 3, 4, and 5) were considered, while the height of the baffles remained fixed. The result showed an enhancement in Nusselt number, friction factor, j-factor, and thermal performance factor. Staggered exit-length baffles showed maximum enhancement in heat transfer and pressure drop, while inline inlet-length baffles showed the least enhancement. For a pitch ratio of Y = 3.0, the enhancement in all parameters was the highest, while for Y = 5.0, the enhancement in all parameters was the least. The highest thermal performance factor of 1.6 was found for SEL at Y = 3.0.

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“…It has been noted that the degree of performance improvement is highly influenced by the type of fin and its geometrical parameter's including pitch, height shape, etc. The configuration presenting maximum heat transfer with minimum pressure drop, i.e., higher thermohydraulic performance, is generally preferred [26,27]. Although this approach indicates selection of collector with maximum overall performance, it failed to ensure the uniformity of air temperature across the collector outlet cross section, which is a vital factor for direct applications of solar collector like drying of crops.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer augmentation of flat plate solar collector through finite element-based parametric study

Rani

Tripathy

2020

J Therm Anal Calorim

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The introduction of fins and baffles on the absorber plate is an effective way to ameliorate the thermal performance of flat plate solar collector (FPSC), but obstructs the air passage leading to considerable pumping power penalty. In the current work, attempt is made to improve the overall performance of collector with the incorporation of hollow semicircular loop fins and rectangular baffles over the absorber plate for air mass flow rate ranging from 0.006 to 0.02 kg s −1 . A parametric study was carried out with finite element approach considering different radius (2-4 cm), pitch (6-20 cm) and number of semicircular loops per row in transverse direction (3-8 loops). Compared to intermittent loops, placement of continuous staggered semicircular loops was more effective for attaining uniform profile and higher magnitude of air temperature at collector outlet. With regard to FPSC, finned collector provided 2.64-2.95 times greater Nusselt number and 41-75% higher thermal efficiency, as well as exhibited 8.38-10.4 K higher collector outlet average air temperature. The pressure drop noted for FPSC was 0.14 Pa and increased to the range of 0.5-0.7 Pa with the addition of loops and baffles at an air mass flow rate of 0.01 kg s −1 . Collector having baffles and continuous semicircular loops of radius 3 cm, made up of 2-mm-thick wire, presented maximum thermohydraulic performance factor of 1.73 in conjunction with showing maximum magnitude and uniform profile of collector outlet temperature. The modified collector with semicircular loops along with baffles will find its application in efficient drying of agricultural commodities.

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Experimental study of thermal performance and pressure drop on a solar air heater with different orientations of arc-shape rib roughness

Cited by 27 publications

References 33 publications

A detailed review on research, technology, configurations and application of wire ribs as artificial roughness in rectangular solar air heater duct

A detailed review on research, technology, configurations and application of wire ribs as artificial roughness in rectangular solar air heater duct

Augmentation of Heat Transfer in a Circular Channel with Inline and Staggered Baffles

Heat transfer augmentation of flat plate solar collector through finite element-based parametric study

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