Heat transfer behaviors in a solar air heater channel with multiple V-baffle vortex generators

Tamna, Sombat; Skullong, Sompol; Thianpong, Chinaruk; Promvonge, Pongjet

doi:10.1016/j.solener.2014.10.020

Cited by 134 publications

(37 citation statements)

References 44 publications

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“…The inlet velocity of the air ranged between 0.9 m/s and 2.9 m/s. A heat flux, q = 1000 W/m 2 , was provided to the upper face of the collector, in a similar manner to the experimental setup of prior investigations [21,22]. The lower wall and the walls on the other sides were thought to be adiabatic.…”

Section: Description Of Computational Modelmentioning

confidence: 99%

“…The values of Reynolds number, Nusselt number, average Nusselt number, friction factor and thermal-hydraulic performance have been calculated using the following equations [15,17,[19][20][21][22][23]:…”

Section: Data Reductionmentioning

confidence: 99%

“…Energies 2016, 9, 564 3 of 18 Tamna et al [22] experimentally and numerically investigated the thermal hydraulic performance of a rectangular passage with a multi V-type blockage fitted to a heated surface for the range of Re values from 4000 to 21,000. Table 1 summarises the experimental investigations of some important baffle arrangements reported by various researchers.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Kumar

Kim

2016

Energies

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This article presents heat transfer and fluid flow characteristics in a solar air heater (SAH) channel with multi V-type perforated baffles. The flow passage has an aspect ratio of 10. The relative baffle height, relative pitch, relative baffle hole position, flow attack angle, and baffle open area ratio are 0.6, 8.0, 0.42, 60˝, and 12%, respectively. The Reynolds numbers considered in the study was in the range of 3000-10,000. The re-normalization group (RNG) k-ε turbulence model has been used for numerical analysis, and the optimum relative baffle width has been investigated considering relative baffle widths of 1.0-7.0.The numerical results are in good agreement with the experimental data for the range considered in the study. Multi V-type perforated baffles are shown to have better thermal performance as compared to other baffle shapes in a rectangular passage. The overall thermal hydraulic performance shows the maximum value at the relative baffle width of 5.0.

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Section: Description Of Computational Modelmentioning

confidence: 99%

Section: Data Reductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Kumar

Kim

2016

Energies

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“…Enhancement in heat transfer as compared with smooth duct was recorded as 2.82 & 3.72 respectively. Tamna et.al [8] performed experiments on heat transfer enhancement on V-baffle vortex generator on air heater absorber plate. The air flowed through the duct had given a uniform heat onto the absorber plate.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of a Solar Air Heater Having Multiple Arc With Gap Type Artificial Roughness and Thermal Storage

2017

IJAERD

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“…Heat transfer augmentation techniques have been extensively developed to improve the thermal performance of heat exchanger systems with a view to reducing the size and cost of the systems, the technique has been widely applied in many engineering applications [4]. These techniques was studied for the evaluation of the convective heat coefficient along the air channel duct with different forms of plate fins inserted in the flow channel duct of the SAHs, allowing a complete representation of the temperatures profile of the absorber [5,6].…”

Section: Introductionmentioning

confidence: 99%

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

Labed¹,

Moummi²,

Benchabane³

et al. 2015

IJHT

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This paper presents an experimental comparative study on the thermal performance and heat exchange of two single pass solar air heaters models (SAHs); we have proceeded to reversing the flow direction in the solar air heater. Initially, to determine the best performing model and to improve the efficiency factor of the SAH. Secondly, to evaluate the convective heat transfer coefficient of both models, named: N-1 and N-2. The indices (1) and (2) indicate, respectively, that the air was blown up or blown down in the channel duct of the SAH. Therefore, we have compared between the efficiencies, the convective heat transfer coefficient, Nusselt number curves and the distribution of air temperatures in the channel ducts of both solar air heaters. Both collectors were designed, constructed and tested in the University of Biskra (Algeria) in a stand facing south at an inclination angle equal to the local latitude. The results show that N-2 model (air blown down) is more efficient than N-1 model (air blown up), and the improvements in the heat exchange due to this technological solution are about 10-20%.

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Heat transfer behaviors in a solar air heater channel with multiple V-baffle vortex generators

Cited by 134 publications

References 44 publications

Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Thermal Hydraulic Performance in a Solar Air Heater Channel with Multi V-Type Perforated Baffles

Performance Analysis of a Solar Air Heater Having Multiple Arc With Gap Type Artificial Roughness and Thermal Storage

EXPERIMENTAL ANALYSIS OF HEAT TRANSFER IN THE FLOW CHANNEL DUCT OF SOLAR AIR HEATERS (SAHs)

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