Numerical investigation of heat transfer and fluid flow in a solar air heater duct with multi V-shaped ribs on the absorber plate

Jin, Dong; Man-man, Zhang; Wang, Ping; Xu, Shasha

doi:10.1016/j.energy.2015.07.069

Cited by 148 publications

(36 citation statements)

References 32 publications

(37 reference statements)

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“…The acquired results showed that the air temperature and highest collector efficiency related to this type with a thickness of 6 mm and an air mass flow rate of 0.025 kg/second. Jin et al 49 studied a numerical investigation of heat transfer and fluid flow characteristics in a solar air heater duct having multi V‐shaped ribs on the absorber plate. The results displayed that the maximum thermal performance parameter was 1.93 for the range of parameters that analyzed.…”

Section: Introductionmentioning

confidence: 99%

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

2020

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In the present study, the effect of utilizing two different types of baffles in the channel of the solar air heater is investigated numerically. The studied baffles include angled rectangular baffles and angled V-shaped baffles, which are mounted on the bottom and top walls of the duct, respectively. Both considered baffles were evaluated separately which the studied parameter in each section was the angular position of baffles. Finally, the best-obtained results of both sections were compared to each other. The results indicated that in the rectangular model by comparison between 90°model and no baffle, it was found that the pressure drop and average Nusselt number increase 316.67% and 148.15%, respectively at Reynolds number (Re) = 2000. Also, in V-shaped angled baffles, the thermal efficiency of β = 90°, 60°, 45°, and 30°are 27%, 18%, 13% higher than no baffle channel at Re = 2000, respectively. Furthermore, at low Re (about Re below 300), utilizing baffles into the channel had no effect on the thermal efficiency of the system compared to the no baffle channel. However, at high Re, it was found that the highest thermal efficiency occurred in the model of rectangular baffles with an angle of 90°. K E Y W O R D S baffle, heat-transfer enhancement, numerical simulation, solar air heater

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Section: Introductionmentioning

confidence: 99%

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

2020

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“…It has been reported by them that the heat transfer for the square ribbed duct was improved 2.86 times that of a smooth duct because of the transverse ribs. Jin et al [15] obtained a higher heat transfer rate for a solar absorber plate attached with multiple V-ribs, which are supposed to produce flow vortices leading to an intense fluid mixing. Other geometrical shape of protrusions such as rectangular, triangular, trapezoidal [16], W-shaped [17,18] and L-shaped [19] have been tested to enhance heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer correlation for a triangular protruded surface with a cross-flow jet

2019

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In this paper, the fluid flow and heat transfer characteristics of a small rectangular channel fitted with triangular protrusions have been studied in a three-dimensional computational domain. A hybrid cooling strategy employing forced convection air stream with jet impingement on the protruded surface has been numerically studied by solving the conservation equations for mass, momentum, energy as well as turbulent kinetic energy and its dissipation rate in the frame work of finite volume method. The duct and nozzle Reynolds numbers and Prandtl number are varied in the range of 17; 827 Re Dh;duct 53; 480, 5; 135 Re Dh;nz 12; 044 and 0:7 Pr 12, respectively. The effects of the duct Reynolds number, nozzle Reynolds number and Prandtl number on heat transfer rate have been quantified. Extensive numerical computation has also been executed to collect the data for Nusselt number by varying each of the independent parameters. A non-linear regression analysis based on Lvenberg-Marquardt (L-M) method has been used to fit a correlation for Nusselt number utilizing the data captured from CFD analysis. adhana(0123456789().,-volV)FT3 ](0123456789().,-volV)

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“…They concluded that the reduction of the open corner ratio leads to an increase in heat transfer rate and friction factor. Jin et al (2015) numerically studied the flow structure and heat transfer in a solar air heater duct with multi V-shaped ribs on the absorber plate. They detected that the optimum thermal performance is around 1.93.…”

Section: Introductionmentioning

confidence: 99%

Convective Heat Transfer, Friction Factor and Thermal Performance in a Round Tube Equipped With the Modified v-Shaped Baffle

Jedsadaratanachai¹,

Boonloi²

2018

Frontiers in Heat and Mass Transfer

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Convective heat transfer, pressure loss and thermal performance in a heat exchanger tube inserted with the modified V-shaped baffle are investigated numerically. The influences of the flow attack angle (α = 20 o , 30 o and 45 o), baffle height in term of blockage ratio (b/D = BR = 0.05, 0.10, 0.15, 0.20 and 0.25) and arrangement (The V-tip pointing downstream is called "V-Downstream", while the V-tip pointing upstream is named "V-Upstream".) on heat transfer and friction loss are presented for the Reynolds number in range 100-1200 (laminar region). The numerical study (finite volume method) is selected to solve the current investigation and to describe the mechanisms inside the heat exchanger tube. The flow visualizations and heat transfer characteristics in the heat exchanger tube are plotted in the numerical-result report. The results on heat transfer, friction factor and thermohydraulic performance of the test tube are compared with the smooth circular tube. It is found that the vortex strength in the heat exchanger tube is an important factor to enhance heat transfer rate and thermal performance. In addition, the maximum thermal enhancement factor is around 3.22 at α = 30 o , BR = 0.2, Re = 1200 for V-Upstream arrangement.

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Numerical investigation of heat transfer and fluid flow in a solar air heater duct with multi V-shaped ribs on the absorber plate

Cited by 148 publications

References 32 publications

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

Numerical evaluation of the thermal performance of a solar air heater equipped with two different types of baffles

Heat transfer correlation for a triangular protruded surface with a cross-flow jet

Convective Heat Transfer, Friction Factor and Thermal Performance in a Round Tube Equipped With the Modified v-Shaped Baffle

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