Convective heat transfer from an inclined isothermal fin array: A computational study

Roy, Kousik; Das, Biplab

doi:10.1016/j.tsep.2020.100487

Cited by 6 publications

(2 citation statements)

References 33 publications

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“…Most of these studies concern flows in vertical geometries, as in the case of electronic component cooling [ 21 ] or natural building ventilation [ 22 ]. However, there are a number of studies on natural convection in inclined channels with heated walls [ 23 , 24 ], aimed at improving the performance of rooftop solar chimneys or roof-mounted solar panels. Other authors have studied mixed convection using fins to cool the channel [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Improved cooling of photovoltaic panels by natural convection flow in a channel with adiabatic extensions

Badi,

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2024

PLoS ONE

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In hot dry regions, photovoltaic modules are exposed to excessive temperatures, which leads to a drop in performance and the risk of overheating. The present numerical study aims to evaluate the natural air cooling of PV modules by an inclined chimney mounted at the back. The basic equations were solved using the finite volume method. The validity of the model is verified by comparison with the data available in the literature. Thermal and dynamic flow patterns are analyzed for a variety of parameters: Rayleigh numbers from 102 to 106, PV panel tilt angle from 15° to 90°, and channel aspect ratios from 1/20 to 1/5. A critical aspect ratio has been determined to minimize overheating of the PV module. According to the computational results, the tilt angle and modified Rayleigh number increase the mass flow rate and mean Nusselt number. The overheating zone with maximum temperatures is located in the upper part of the photovoltaic panel. The addition of an extension to both channel’s inlet and outlet was found to improve the cooling of the photovoltaic panels; however, only the extensions downstream of the channel are truly effective. The critical lengths at which channel performance improves significantly were identified by examining the impact of longer extensions on channel performance. Increasing the extension length from 0 to 3H improves the mass flow rate by 65%, the average Nusselt number by 13.4%, and leads to an 11% decrease in maximum temperature when Ra* = 106. This cooling technique is particularly promising for hot dry regions where water is scarce.

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Section: Introductionmentioning

confidence: 99%

Improved cooling of photovoltaic panels by natural convection flow in a channel with adiabatic extensions

Badi,

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2024

PLoS ONE

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“…Chen et al (2017) studied numerically and experimentally the heat transfer and fluid flow characteristics of a plate-fin heat sink. Again, Roy and Das (2020) investigated mixed convection from an isothermal and nonisothermal plated inclined fin array, respectively.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Analysis of Slightly Inclined Finned Channel under Natural Convection

2022

JAFM

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The influence of slight inclination, 'α' (i.e., 10°, 15°, and 20°) of the channel comprised of shrouded vertical rectangular non-isothermal fin array has been computationally investigated. Simulations are performed to obtain the convective coefficient of heat transfer for the different dimensionless fin spacing (S * = 0.2, 0.3, 0.5), non-dimensional fin tip to shroud clearances (C * = 0.1, 0.2 and 0.3), Grashof numbers (Gr= 1.08×10 5 , 4.42×10 5 and 11.5×10 5 ), fin lengths (L= 0.25m and 0.5m) and fin heights (H= 0.025m, 0.04m, and 0.055m). Hydrodynamic behavior of the fluid indicates that a significant amount of flow reversal occurs near the entrance of the channel at very low inclination which vanishes with the increase in inclination. Further, at higher length, reverse flow is found to occur only in the clearance zone. An increase in the value of 'α' from 10° to 20°, results in enhancement of convective coefficient up to a maximum of 161%. An increase in the value of fin spacing from 0.2 to 0.5 results in the enhancement of the convective heat transfer coefficient. At α= 15° and 20°, the heat transfer is enhanced by 84.1% and 101.6%, respectively, while at α=10°, the same is reduced by 33.3%. At lower fin spacing (S * <0.3) increase in C * tends to reduce the efficiency. Further, the efficiency of the finite conductive fin is found to reduce by almost 8% with an increase in Grashof number.

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Numerical investigations on fluid flow and heat transfer characteristics of different locations of winglets mounted in fin-tube heat exchangers

Naik

Tiwari

2021

Thermal Science and Engineering Progress

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Convective heat transfer from an inclined isothermal fin array: A computational study

Cited by 6 publications

References 33 publications

Improved cooling of photovoltaic panels by natural convection flow in a channel with adiabatic extensions

Improved cooling of photovoltaic panels by natural convection flow in a channel with adiabatic extensions

Thermo-Hydraulic Analysis of Slightly Inclined Finned Channel under Natural Convection

Numerical investigations on fluid flow and heat transfer characteristics of different locations of winglets mounted in fin-tube heat exchangers

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