CFD simulation of thermal dissipation from fan-added plate fin and offset strip fin heat sinks

2004 ◽  
Author(s):  
Won Nyun Kim ◽  
Seo Young Kim ◽  
Byung Ha Kang
Keyword(s):  
Cfd Simulation ◽  
Heat Sinks ◽  
Thermal Dissipation ◽  
Offset Strip Fin

scholarly journals Numerical and Experimental Investigation of Air Cooling for Photovoltaic Panels Using Aluminum Heat Sinks

2020 ◽  
Vol 2020 ◽  
pp. 1-9 ◽  
Author(s):  
Zainal Arifin ◽  
Dominicus Danardono Dwi Prija Tjahjana ◽  
Syamsul Hadi ◽  
Rendy Adhi Rachmanto ◽  
Gabriel Setyohandoko ◽  
...  
Keyword(s):  
Heat Sink ◽  
Cfd Simulation ◽  
Operating Temperature ◽  
Ambient Air ◽  
Heat Sinks ◽  
Solar Irradiation ◽  
Electrical Performance ◽  
Electricity Production ◽  
Air Cooling ◽  
Pv Panel

An increase in the operating temperature of photovoltaic (PV) panels caused by high levels of solar irradiation can affect the efficiency and lifespan of PV panels. This study uses numerical and experimental analyses to investigate the reduction in the operating temperature of PV panels with an air-cooled heat sink. The proposed heat sink was designed as an aluminum plate with perforated fins that is attached to the back of the PV panel. A comprehensive computational fluid dynamics (CFD) simulation was conducted using the software ANSYS Fluent to ensure that the heat sink model worked properly. The influence of heat sinks on the heat transfer between a PV panel and the circulating ambient air was investigated. The results showed a substantial decrease in the operating temperature of the PV panel and an increase in its electrical performance. The CFD analysis in the heat sink model with an air flow velocity of 1.5 m/s and temperature of 35°C under a heat flux of 1000 W/m2 showed a decrease in the PV panel’s average temperature from 85.3°C to 72.8°C. As a consequence of decreasing its temperature, the heat sink increased the open-circuit photovoltage (VOC) and maximum power point (PMPP) of the PV panel by 10% and 18.67%, respectively. Therefore, the use of aluminum heat sinks could provide a potential solution to prevent PV panels from overheating and may indirectly lead to a reduction in CO2 emissions due to the increased electricity production from the PV system.

scholarly journals Enhancement of PV Panel Power Production by Passive Cooling Using Heat Sinks with Perforated Fins

2021 ◽  
Vol 11 (23) ◽  
pp. 11323
Author(s):  
Sebastian Valeriu Hudișteanu ◽  
Florin Emilian Țurcanu ◽  
Nelu Cristian Cherecheș ◽  
Cătălin George Popovici ◽  
Marina Verdeș ◽  
...  
Keyword(s):  
Numerical Model ◽  
Heat Sink ◽  
Cfd Simulation ◽  
Convective Heat Transfer Coefficient ◽  
Power Production ◽  
Heat Sinks ◽  
Passive Cooling ◽  
Base Case ◽  
Average Temperature ◽  
Pv Panel

This paper presents a numerical model regarding the passive cooling of PV panels through perforated and non-perforated heat sinks. A typical PV panel was studied in a fixed position, tilted at 45 degrees from the horizontal with the wind direction towards its backside. A challenging approach was used in order to calibrate the base case of the numerical model according to the NOCT conditions. Further validation of the accuracy of the numerical simulation consisted of a comparison between the results obtained for the base case, or heat sink, with horizontal non-perforated fins and the experiments presented in the literature. Six types of heat sink attached to the backside of the PV panel were numerically studied. The analyzed configurations focused on heat sinks with both perforated and non-perforated fins that were distributed horizontally and vertically. The CFD simulation was also conducted by modeling the air volume around the PV panel in real wind conditions. The main output parameters were the average temperature and the convective heat transfer coefficient on the front and back of the PV panel. The most important effect of cooling was achieved in low wind conditions and high levels of solar radiation. For vair = 1 m/s, G = 1000 W/m2 and ambient temperature tair = 35 °C, the percentage of maximum power production achieved 83.33% for the base case, while in the best cooling scenario it reached 88.74%, assuring a rise in the power production of 6.49%.

Cooling of Concentrated Photovoltaic System Using Various Configurations of Phase-Change Material Heat Sink

2016 ◽  
Author(s):  
Mohamed Emam ◽  
Mahmoud Ahmed ◽  
Shinichi Ookawara
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Sink ◽  
Fluid Model ◽  
Heat Sinks ◽  
Photovoltaic System ◽  
Thermal Dissipation ◽  
Thermal Regulation ◽  
Change Material ◽  
Single Cavity

In the current work, a hybrid system including Concentrated photovoltaic (CPV) and phase change material (PCM) as a heat sink is considered as a single module to achieve high solar conversion efficiency. The main objective is to accelerate the thermal dissipation with a longer thermal regulation period. Thus, a new CPV-PCM system using various configurations of the PCM heat sink and different combinations of PCMs is investigated. This study presents a numerical simulation of the effects of PCM materials and designs on the CPV-PCM system performance. To estimate the thermal performance of the new CPV-PCM system, a comprehensive 2-D model for CPV layers integrated with PCMs is developed. This model couples a thermal model for CPV layers and a thermo-fluid model that considers the phase-change phenomenon using the enthalpy method. The model is numerically simulated at different configurations and combinations of PCM with various ranges of phase transition temperatures. Three different configurations of PCMs are investigated: one with a single cavity, and two with parallel arrangements including three and five cavities. Results indicate that the use of PCM heat sinks with three and five cavities increases the heat transfer inside the PCM and achieves a significant reduction of the solar cell temperature compared with a single cavity CPV-PCM system. Furthermore, thermal regulation effect and temperature uniformity of the CPV-PCM system is enhanced by using various combinations of PCMs.

scholarly journals Comparative study of heat and fluid flow characteristics of parallel and offset strip fin micro-channels using CFD simulations

2018 ◽  
Vol 22 (5) ◽  
pp. 1973-1985
Author(s):  
Vinod Venkiteswaran ◽  
Cheah Yee ◽  
Chia Ming
Keyword(s):  
Cooling System ◽  
Flow Characteristics ◽  
Type A ◽  
Heat Sinks ◽  
Micro Channel ◽  
Smooth Flow ◽  
Side Channels ◽  
Micro Channels ◽  
Fluid Flow Characteristics ◽  
Offset Strip Fin

The primary aim of this study was to consider novel configurations of water-cooled micro-channel layout and compare them with existing configurations. The authors emphasize on establishing a benchmark based on investigations by earlier researchers and numerically analysing them. As a first attempt, offset strip fins are compared with existing parallel fins in terms of subsequent flow fields and temperature profiles. In offset types designated as A and B, the highest velocities occur at the side channels because of the straight wall allowing smooth flow through the channel. Generally, for offset type, the velocity increases after the sidewalls towards the centre. Type A configuration had an uneven velocity profile because of its staggered channel entrance. The lowest average temperature was observed in parallel heat sinks, followed by type A and type B. Causes are discussed for the observed differences and criteria are suggested for the selection of an appropriate geometry of offset fins. An efficient cooling system will ensure effective working of equipment resulting in low energy consumption and better sustainability. This work opens a platform for research on various other configurations and their use in micro-channel cooling.

Thermal Performance Analysis of Fan-Heat Sinks for CPU Cooling

2003 ◽  
Author(s):  
Seo Young Kim ◽  
Ralph L. Webb
Keyword(s):  
Thermal Resistance ◽  
Thermal Performance ◽  
Heat Sink ◽  
Heat Sinks ◽  
Operating Point ◽  
Pin Fin ◽  
Flow Impedance ◽  
Impedance Curve ◽  
Convective Thermal ◽  
Offset Strip Fin

The thermal performance of plate fin, round pin-fin and offset strip-fin heat sinks with a duct-flow type fan arrangement was analytically evaluated. Heat sinks of 65mm × 60mm plan area × 50 mm height with a 4300-RPM DC fan (60mm × 15mm) were chosen for the performance comparison. A constant temperature, 6 mm thick heat sink base plate is assumed so that thermal spreading resistance is not involved. The operating point on the fan curve is based on the flow pressure drop impedance curve through a heat sink using the friction factor correlation for the chosen heat sink. The loss coefficients at both the entrance and the exit of heat sink are included in the flow impedance curve. The operating point is defined by the balance point of the flow impedance curve and the fan performance curve. After determining the operating air velocity, the convective thermal resistance of heat sinks is evaluated from the Nusselt number correlation for the chosen heat sink. Results obtained show that optimized round pin-fin heat sinks provide 32.8%-to-46.4% higher convective thermal resistance compared to an optimized plate-fin heat sink. The optimized offset strip-fin heat sink shows a slightly lower convective thermal resistance than the plate-fin heat sink. As the offset strip length decreases, however, thermal performance seriously deteriorates.

Optimization of Pin-Fin Heat Sinks Using the Two Medium Anisotropic Porous Model

2002 ◽  
Author(s):  
Seo Young Kim ◽  
Andrey V. Kuznetsov
Keyword(s):  
Heat Sink ◽  
Numerical Solutions ◽  
Solid Phase ◽  
Numerical Study ◽  
Heat Sinks ◽  
Thermal Dissipation ◽  
Uniform Heat Flux ◽  
Pin Fin ◽  
Geometric Conditions ◽  
Optimum Porosity

A numerical study has been carried out to optimize the thermal performance of a pin-fin heat sink. A pin-fin heat sink placed horizontally in a channel is modeled as a hydraulically and thermally anisotropic porous medium. A uniform heat flux is prescribed at the bottom of the heat sink. Cold air is supplied from the top opening of the channel and exhausts to the channel outlet. Comprehensive numerical solutions are derived from the governing Navier-Stokes and energy equations, using the Brinkman-Forchheimer extended Darcy model and the local thermal non-equilibrium (LTNE) model for the region of heat sink. Results from this study indicate that the anisotropy in permeability and solid-phase effective thermal conductivity changes substantially with the variation of porosity. The pin-fin heat sinks considered in the present study show an optimum porosity of 0.75<εopt<0.95 for maximum thermal dissipation depending on the flow and geometric conditions. Generally, a thick pin-fin displays a lower optimum porosity.

A Genetic Algorithm Based Multi-Objective Thermal Design Optimization of Liquid Cooled Offset Strip Fin Heat Sinks

2009 ◽  
Author(s):  
Sidy Ndao ◽  
Yoav Peles ◽  
Michael K. Jensen
Keyword(s):  
Genetic Algorithm ◽  
Pressure Drop ◽  
Aspect Ratio ◽  
Power Consumption ◽  
Thermal Resistance ◽  
Thermal Design ◽  
Heat Sinks ◽  
Total Thermal Resistance ◽  
Offset Strip Fin ◽  
Fin Length

A genetic algorithm based multi-objective thermal design optimization of liquid cooled offset strip fin heat sinks is presented. Using water and HFE-7000 as coolants, Matlab’s genetic algorithm and direct search toolbox functions were utilized to determine the optimal thermal design of the offset strip fin heat sink based on the total thermal resistance and power consumption under constant pressure drop. For a relatively small fin length, the total thermal resistance decreases with increasing fin length and aspect ratio α. For larger fin lengths, the total thermal resistance increases with increasing fin length whereas the power consumption continuously increases with increasing fin length and aspect ratio α for a given pressure drop. A plot of the Pareto front indicates a trade-off between the total thermal resistance and pumping power consumption.

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