Computational thermal analysis of cylindrical fin design parameters and a new methodology for defining fin structure in LED automobile headlamp cooling applications

SÖKMEN, Kemal Furkan; Yürüklü, Emrah; Yamankaradeni̇z, Nurettin

doi:10.1016/j.applthermaleng.2015.10.069

Cited by 20 publications

(16 citation statements)

References 8 publications

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“…The analysis was carried with various ambient temperatures such as 25°C, 50°C and 80°C and at various HPLED power dissipations such as 0.5W, 0.75W, 1W and 1.25 W respectively. The author confirmed that including an aluminum or copper plate behind the PCB at lower ambient temperature is adequate to operate the HPLED [7]. Using a high power COB (chip on board) HPLED, Badalan et.…”

Section: Introductionmentioning

confidence: 87%

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

Kumar

Arunachalam

2020

Journal of Thermal Engineering

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Halogen bulbs are sources of light of headlamps of most of the vehicles running around the world. To get better night vision, vehicle owners want to replace the conventional halogen bulbs with HPLEDs without replacing the conventional headlamp assembly. Though High Power Light Emitting Diodes (HPLED) are efficient sources of light for replacing halogen bulbs, conventional headlamps are not designed for HPLEDs and so replaced HPLEDs will fail within a short duration due to poor cooling. The aim of this work is to develop a compact cooling system for a conventional headlamp assembly to accommodate HPLEDs. An air cooled system with a compact heat sink is proposed in this work. To decide the dimensions of the compact heat sink various heatsink sizes were modeled and simulated in ANSYS. For this study, a popular SUV's headlamp is chosen and complete tests were carried out in absence of external lights on a flat black surface for about 28 meters. The light intensity is measured in terms of lux for Halogen and HPLED's horizontal passing beam at various test points. For generating the same intensity of light, it was found from the experimental results that the HPLED consumes only one third of the energy supplied to halogen bulbs. With the proposed cooling system the junction temperature was reduced by about 25% when the cooling fan is operated at laminar flow conditions. On the other hand, the luminous intensity of the HPLED improved by about 30.9% due to the decrease in junction temperature. The HPLED headlamp reflector inner wall temperature is found to be 49 % lesser than Halogen bulb headlamp reflector inner wall temperature.

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Section: Introductionmentioning

confidence: 87%

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

Kumar

Arunachalam

2020

Journal of Thermal Engineering

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“…The morphological, structural and optical properties were studied for different RE ions (Tm 3þ , Tb 3þ and Sm 3þ ) doped YWO samples. 2 ) which are purchased from Sigma Aldrich Co., South Korea. All the chemicals were of analytical grade and were used as received without any further purification.…”

Section: Introductionmentioning

confidence: 99%

RE3+ (RE3+ = Tm3+, Tb3+ and Sm3+) ions activated Y6WO12 phosphors: Synthesis, photoluminescence, cathodoluminescence and thermal stability

Bharat

Jeon

2016

Journal of Alloys and Compounds

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“…This resulted in using LED in airfield, runway and taxiway lighting systems [5]. Sokmen et al [6] studied the effects of fin design, fin material, and free and forced convection on junction temperature in automotive headlamp cooling applications of LED lights using ANSYS CFX 14 software. Furthermore, a new methodology was developed to define the optimum cylindrical fin structure within the given limits.…”

Section: Introductionmentioning

confidence: 99%

Computational Investigation on Radiative Heat Transfer Characteristics of an Automotive LED Tail Light

Sriraman¹,

Revanth²,

Swaminathan³

2019

mech

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Nomenclature  is Fluid Density, kg/m 3 ; E is Energy, J; p is Pressure, Pa; keff is Effective Conductivity, W/(m⋅K); T is Temperature, K; h is Sensible Enthalpy, J/kg; j J is Diffusion Flux, mol/(m 2 s); eff τ is Effective Viscous Stress N/m 2 ; V is Velocity Vector, m/s; Sh is Heat Source, J; qout,k is Energy Flux leaving the surface, J; k is Emissivity of the Surfaces, J/m 2 ;  is Stefan Boltzmann Constant; Tk is Temperature of the area, K; k is Density of the area, kg/m 3 ; qin,k is Energy Flux incident on the surface, J. Subscripts: eff -Effective; jindex of coordinate; hheat; ksurface.

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Computational thermal analysis of cylindrical fin design parameters and a new methodology for defining fin structure in LED automobile headlamp cooling applications

Cited by 20 publications

References 8 publications

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

Automotive Headlamp High Power Led Cooling System and Its Effect on Junction Temperature and Light Intensity

RE3+ (RE3+ = Tm3+, Tb3+ and Sm3+) ions activated Y6WO12 phosphors: Synthesis, photoluminescence, cathodoluminescence and thermal stability

Computational Investigation on Radiative Heat Transfer Characteristics of an Automotive LED Tail Light

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