Computational and experimental assessment of solar air heater roughened with six different baffles

Sharma, Sachin; Das, Randip Kumar; Kulkarni, Kishor

doi:10.1016/j.csite.2021.101350

Cited by 54 publications

(15 citation statements)

References 51 publications

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“…The obtained experimental results depicted that by employing the proposed SAH system, the maximum exergy efficiency of 2.925 could be achieved. Sharma et al 31 evaluated numerically the thermal performance of the SAH considering six various geometries of baffles. The obtained numerical outcome depicted that baffles position and shape have considerable impact on the thermal performance of the SAH.…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Kadijani

Moghadam

Ajarostaghi

et al. 2022

Energy Science & Engineering

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In this numerical work, heat transfer characteristics of humid air in a rectangular channel as solar air heater equipped with V-shaped ribs has been investigated. The impacts of geometrical parameters of proposed ribs such as height, pitch, and angle relative to air flow direction, as well as relative humidity and Reynolds number of inlet humid air on thermal performance of proposed solar air heater have been evaluated. The numerical results have been achieved using commercial Computational Fluid Dynamics (CFD) code, ANSYS FLUENT 18.2, which works based on finite volume method. Outcomes shows that, over a wide range of operating conditions, utilizing ribs cause thermal boundary layer to separate and reattach, and eventually enhance heat transfer rate. Increasing the rib angle produces stronger secondary flows, leading to higher local velocities and greater heat transfer rate. Moreover, increasing the relative humidity of inlet air from 0% to 50% leads to improve heat transfer by up to 6%. As Reynolds number increases from 4000 to 12,000, average Nusselt number rises by 7.3% and 31.4% for rib pitches of 6 and 16 mm, respectively. The results demonstrate how thermal performance of a solar air heater can be improved by utilizing V-shaped ribs.

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Section: Introductionmentioning

confidence: 99%

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Kadijani

Moghadam

Ajarostaghi

et al. 2022

Energy Science & Engineering

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“…The poor heat carrying capacity of air due to the lower value of the convective coefficient deteriorates the performance of SAHs. 5 In wide-open literature, various techniques such as providing artificial roughness in form of ribs, 6,7 fins, 8,9 baffles, 10,11 winglets 12,13 on the heat-absorbing surface of conventional flat plate SAHs, impingement jets, 14,15 etc. have been implemented to improve performance of SAHs by breaking the viscous layer that is accumulated over the heat-absorbing surface.…”

Section: Introductionmentioning

confidence: 99%

“…The sine wave-shaped baffles on the absorber plate, on the other hand, have received little attention. The authors examined the efficacy of solar air heaters in a prior study 11 by using six different baffles. Previous research has shown that sine wave shaped baffles perform better than other studied baffles, but that performance may be further improved by selecting the best set of geometry and operational parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis and thermal management of solar air heater roughened with sine wave baffles

Sharma

Das

Kulkarni

2022

Proceedings of the Institution of Mechanical Engineers, Part A:

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In the present study, a thermo-hydraulic performance (THP) of solar air heater (SAH) has been assessed by placing sine wave-shaped baffles on the heat-absorbing surface. The experiments have been performed by varying Reynolds number ([Formula: see text]) ranging from 3000-18,000, relative pitch ([Formula: see text]) ranging from 8 to 14, relative height ([Formula: see text]) ranging from 0.4 to 0.55, relative baffle length [Formula: see text] ranging from 0.054 to 0.081 and angle of attack(α) ranging from 10° to 45° while the duct aspect ratio has been kept fixed at 12. The best set of geometric parameters has been decided based on Nusselt number [Formula: see text] and friction factor [Formula: see text] characteristics of the roughened SAH and compared with the smooth surface SAH, under analogous experimentation conditions. The cost analysis has also been performed and results revels that roughened SAH is more cost-effective than smooth SAH. The correlation for Nusselt number [Formula: see text], friction factor [Formula: see text], and thermo-hydraulic performance parameters (η) have been developed using regression analysis and found an average deviation of ±9.15%, ±7%, and ±9.2% respectively, from experimental results.

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“…Kumar et al [8] found that broken multiple e V-type baffle gives a great thermo-hydraulically results compared with the rest baffles through an experimental investigation performed with Reynolds numbers varying from Re=3000 to Re=8000. Sharma et al [9] performed experimental and CFD investigations of the heat transfer inside a duct of solar air collector with different shapes of baffles. They used six configurations to get the best shape through the thermohydraulic performances from Re=3000 to Re=18000.…”

Section: Introductionmentioning

confidence: 99%

Determination of the heat transfer coefficient by convection, according to shape of the baffles (solar air collector)

et al. 2022

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This experimental study and mathematical modelling aim to improve the heat transfer by convection in different cases of transversal baffles inside a duct of a solar air collector. The study enabled us to formulate a mathematical equation of the heat transfer coefficient as a function of pressure drop and the mass flow rates. This mathematical model gave results that are close to the actual results in different inclination angles of the baffles (45°, 90°, 135°, and mixed between 135°and 45°). Through these results, it is found that the best heat transfer coefficient by convection was in the mode where = 90° and in the mixed mode. It was also noticed that the pressure drop in the mixed mode was smaller. With respect to the thermo-hydraulic performance factor (THPF), the case =45° was retained as the best case.

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Computational and experimental assessment of solar air heater roughened with six different baffles

Cited by 54 publications

References 51 publications

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Hydrothermal performance of humid air flow in a rectangular solar air heater equipped with V‐shaped ribs

Experimental analysis and thermal management of solar air heater roughened with sine wave baffles

Determination of the heat transfer coefficient by convection, according to shape of the baffles (solar air collector)

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