Effect of secondary flows due to buoyancy and contraction on heat transfer in a two-section plate-fin heat sink

Karathanassis, Ioannis K.; Papanicolaou, E.; Belessiotis, V.; Bergeles, G.

doi:10.1016/j.ijheatmasstransfer.2013.02.028

Cited by 12 publications

(6 citation statements)

References 31 publications

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“…The main objectives of the study are to illustrate the design procedure and to highlight all the technical challenges associated with the development of a novel, linear-focus CPVT system and furthermore to experimentally evaluate the optical, electrical and thermal efficiencies achieved by the system. Furthermore, the present investigation constitutes a proof-of-concept study of the successful integration of two novel heat-sink configurations developed [30][31][32][33] in a prototype CPVT system. Three different system receiver configurations were considered employing different PV modules and cooling devices of different design layouts.…”

Section: Chemisana Et Al [20]mentioning

confidence: 99%

“…Regarding the VW design, it has been verified in [43] that the power required for pumping the fluid through the heat sink is reduced by approximately 85% compared to the respective required by the FW configuration. In addition, the VW configuration achieves a more uniform cooling of the solar cells, which could also enhance the electrical production of large-scale systems [31,32].…”

Section: Thermal and Electrical Performance Of The Cpvt Systemmentioning

confidence: 99%

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Dynamic simulation and exergetic optimization of a Concentrating Photovoltaic/ Thermal (CPVT) system

et al. 2019

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The design and performance evaluation of a novel parabolic-trough concentrating photovoltaic/thermal (CPVT) system are discussed in the present study. Initially, the system design and manufacturing procedures as well as the characteristics of the system subcomponents are thoroughly illustrated. At a second stage, the findings in regard to the optical quality of the parabolic trough are presented, as obtained through an experimental procedure that utilizes a custom-made measuring device. The device bears a grid of sensors (photodiodes), so that the irradiation distribution on the receiver surface and the achieved concentration ratio can be determined. Besides, the main factors that have a significant effect on the trough optical quality were identified through ray-tracing simulations. The system electrical and thermal performance was subsequently evaluated in a test rig specially developed for that reason. Three variations of the system receiver incorporating different PVmodule and heat-sink designs were evaluated and the prototype CPVT system was found to achieve an overall efficiency approximately equal to 50% (44% thermal and 6% electrical efficiencies, respectively) with a very weak dependency on the operating temperature.

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Section: Chemisana Et Al [20]mentioning

confidence: 99%

Section: Thermal and Electrical Performance Of The Cpvt Systemmentioning

confidence: 99%

Dynamic simulation and exergetic optimization of a Concentrating Photovoltaic/ Thermal (CPVT) system

et al. 2019

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“…To maintain the desired temperature of the LED, it is necessary to extend the surface area of the heatsink with suitable geometry. The influence of extended heat transfer surface area on the heat dissipation and device performance has already been investigated by many researchers (Diani et al , 2013; Karathanassis et al , 2013; Chen et al , 2013; Llano-Sánchez et al , 2018; Pandya and Megha, 2019; Fugmann et al , 2018). Karathanassis et al (2013) have investigated the efficiency of the extended heatsink surfaces and discussed the preference of natural convection for cost effective heatsinks.…”

Section: Introductionmentioning

confidence: 99%

Influence of extended surface area of heatsink on heat transfer: design and analysis

Shanmugan

Devarajan²

2023

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Purpose Light emitting diode (LED) has been the best resource for commercial and industrial lighting applications. However, thermal management in high power LEDs is a major challenge in which the thermal resistance (Rth) and rise in junction temperature (TJ) are critical parameters. The purpose of this work is to evaluate the Rth and Tj of the LED attached with the modified heat transfer area of the heatsink to improve thermal management. Design/methodology/approach This paper deals with the design of metal substrate for heatsink applications where the surface area of the heatsink is modified. Numerical simulation on heat distribution proved the influence of the design aspects and surface area of heatsink. Findings TJ was low for outward step design when compared to flat heatsink design (ΔT ∼ 38°C) because of increase in surface area from 1,550 mm2 (flat) to 3,076 mm2 (outward step). On comparison with inward step geometry, the TJ value was low for outward step configuration (ΔTJ ∼ 6.6°C), which is because of efficient heat transfer mechanism with outward step design. The observed results showed that outward step design performs well for LED testing by reducing both Rth and TJ for different driving currents. Originality/value This work is authors’ own design and also has the originality for the targeted application. To the best of the authors’ knowledge, the proposed design has not been tried before in the electronic or LED applications.

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“…The triangular vortex generator was the optimum fin form. Karathanassis et al (2013) numerically analyzed the impact of buoyancy forces on the cooling rate of the two-section PFHS. The experiment was performed over a range of Re, before the stepwise reduction, between 559 and 667.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance investigation of a plate fin heat sink equipped with twisted tape and perforated twisted tape

Nilpueng

2021

JTST

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Thermal performance investigation of a plate fin heat sink equipped with twisted tape and perforated twisted tape Abstract The concept of heat transfer enhancement in a plate fin heat sink (PFHS) using twisted tape is presented. The airflow behavior in the flow channel and heat sink performance are investigated at the Reynolds numbers between 2000 and 5000. The twisted tape and perforated twisted tape with twist ratio between 2.5 and 3.5 are equipped between the fins of the PFHS. For perforated twisted tape, the holes are drilled along the twisted tape length with the ratio of perforation diameter to twisted taped width (d/W) between 0.2 and 0.6. The heat transfer coefficient and pressure drop are enhanced by decreasing the twist ratio and increasing the Reynolds number and the d/W ratio between 0.2 and 0.4. However, they are dropped when the d/W ratio higher than 0.4. The highest thermal performance factors of the plate fin heat sink equipped with twisted tape (PFHSTT) and the plate fin heat sink equipped with perforated twisted tape (PFHSPTT) are 1.28 and 1.33, respectively. The correlations of the Nusselt number and friction factor related to twist ratio and d/W ratio are generated and proposed for designing and selecting in the future.

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Effect of secondary flows due to buoyancy and contraction on heat transfer in a two-section plate-fin heat sink

Cited by 12 publications

References 31 publications

Dynamic simulation and exergetic optimization of a Concentrating Photovoltaic/ Thermal (CPVT) system

Dynamic simulation and exergetic optimization of a Concentrating Photovoltaic/ Thermal (CPVT) system

Influence of extended surface area of heatsink on heat transfer: design and analysis

Thermal performance investigation of a plate fin heat sink equipped with twisted tape and perforated twisted tape

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