Numerical investigation of heat transfer enhancement in a solar air heater roughened by multiple V-shaped ribs

Jin, Dong; Quan, Shenglin; Zuo, Jianguo; Xu, Shiming

doi:10.1016/j.renene.2018.11.016

Cited by 155 publications

(25 citation statements)

References 33 publications

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“…Singh et al [3]used multiple broken ribs for a relative pitch of 10, relative height of 0.043 and achieved a maximum improvement of about 3.24 times that of smooth duct while the friction factor increased by about 3.85 times. Multiple V-shaped ribs provide much improved performance as compared to transverse V-shape as reported by Jin et al [4]. They made use of Computational Fluid Dynamics (CFD) methodology and found that the highest thermal enhancement factor was about 2.35 times and the rib geometrical parameters are reported to affect the performance.…”

Section: Introductionmentioning

confidence: 92%

CFD analysis for thermal performance augmentation of solar air heater using deflector ribs

Venkatesh

Kumar

Madhwesh

et al. 2020

JMES

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This paper presents the effect of deflector ribs on the thermal performance of flat plate solar air heater using Computational Fluid Dynamics (CFD) methodology. The analysis is carried out using two-dimensional computational domain for the Reynolds number range of 6000-18000. RNG k-є turbulence model is used to capture the turbulence characteristics of the flow. The deflector rib has a cross-section of isosceles triangle and is placed transversely with respect to the flow. The distance between consecutive ribs is varied as 40mm, 80mm, 160mm and 320mm while the air gap height is varied as 2mm, 3mm, 5mm and 10mm. The numerical model is validated against the well-known correlation of Dittus-Boelter for smooth duct. The simulation results reveal that the presence of deflector ribs provide augmented heat transfer through flow acceleration and enhanced turbulence levels. With reference to smooth duct, the maximum achieved heat transfer improvement is about 1.39 times for the inter-rib distance of 40mm and an air gap height of 3mm while the maximum fiction factor achieved was about 3.82 times for pitch value of 40mm and air gap height of 3mm. The highest thermal enhancement factor is achieved for the pitch value of 320mm and an air gap height of 3mm at Re=6000. The air gap height value of 10mm exhibits thermal enhancement factor values lesser than 1.0 and hence is not recommended for use as heat transfer enhancement device for the entire Reynolds number range used in the analysis. The pitch value of 320 mm exhibits thermal enhancement factor greater than 1.0 for almost all the Reynolds number range used in the analysis and varies between 0.93 and 1.07.

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Section: Introductionmentioning

confidence: 92%

CFD analysis for thermal performance augmentation of solar air heater using deflector ribs

Venkatesh

Kumar

Madhwesh

et al. 2020

JMES

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“…Turbulence model k-є RNG model were used and were in decent agreement with the experimental outcomes. Jin D. et al (2019) numerically studied the heat transfer and fluid flow characteristics of a multiple V-shaped rib roughened solar air heater (SAH). It was concluded that The Multiple V-shaped ribs significantly augmented the heat transfer and 2.35 was the max thermos hydraulic found.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Review of Performance Analysis of With and Without Fins Solar Thermal Collector

Kumar¹,

Kumar²,

Thakur³

et al. 2021

Frontiers in Heat and Mass Transfer

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Solar thermal collector is a simple, economic, and environment friendly equipment which is used to utilize solar energy for various agriculture and industrial applications. The investigators mainly focus on the improvement of the thermal performance by providing various fins shapes underside of the absorber plate in the single pass and double pass solar thermal collector. This work discusses the influence of different shaped fins used by various researchers in improving the thermal performance of thermal collectors. Fin's design, geometries used, and their influence on turbulence and thermal performance have also been discussed. As per the literature review and comparative study the heat transfer rate is greater for solar air thermal collector with fins as compared to solar air thermal collector without fins.

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“…There are several research works about technical solutions to increase the system performance [7][8][9]. The following ideas including the use of extruded surfaces such as baffles [10], straight and helicoidal spring shaped fins [11,12], twisted-rib roughness [13], hyperbolic ribs [14], and employing V-shaped absorbers [15] were addressed by some investigations. The energy and exergy performances of an offset finned solar air heater were numerically investigated by Rai et al [16].…”

Section: Introductionmentioning

confidence: 99%

Performance Augmentation of Solar Air Heater for Space Heating Using a Flexible Flapping Guide Winglet

2021

IJEE

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Numerical investigation of heat transfer enhancement in a solar air heater roughened by multiple V-shaped ribs

Cited by 155 publications

References 33 publications

CFD analysis for thermal performance augmentation of solar air heater using deflector ribs

CFD analysis for thermal performance augmentation of solar air heater using deflector ribs

A Comprehensive Review of Performance Analysis of With and Without Fins Solar Thermal Collector

Performance Augmentation of Solar Air Heater for Space Heating Using a Flexible Flapping Guide Winglet

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