Experimental investigation on the thermal performance of three-dimensional vapor chamber for LED automotive headlamps

Lü, Zhimin; Bai, Peng; Huang, Bin; Henzen, Alex; Coehoorn, R.; Liao, Hua Lin; Zhou, Guofu

doi:10.1016/j.applthermaleng.2019.03.049

Cited by 38 publications

(12 citation statements)

References 31 publications

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“…Researchers have also focused on heat problems in-vehicle LED headlights. Recent studies on automotive LED headlights have been focused on new designs [16][17][18][19][20][21][22]. Jang and Shin [16] investigated the thermal performance of a new cooling system for a light-emitting diode headlamp module.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of different heat sink fin structures on the thermal performance of automotive LED headlights

Şevik

Özdilli

AKBULUT

2022

International Journal of Automotive Science and Technology

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With the developing technology, the automotive lighting sector is also changing rapidly. Automotive lighting equipment is produced with more functionality and higher performance. However, with the increase in perfor-mance, undesirable heat generation also increases. Automotive headlights fail or perform poorly when exposed to high heat; therefore, unwanted heat has to be removed. This is accomplished with heat sinks. In this study, four different automotive light-emitting diode (LED) headlights have been designed as channelless, 4-channel, 8-channel, and 12-channel. The designed models were tested numerically at different LED powers (8, 10, 12, 14, and 16W). Thus, the impact of heat sink fin structures on the thermal performance of automotive LED headlights was investigated numerically. The heat dissipation performances of the designs were analyzed using the computational fluid dynamics software SolidWorks Flow Simulation. The simulation results showed that the designed products can be used as LED headlights. As the applied heat power increased, maximum tem-peratures also increased. While a continuous increase in performance was achieved in designs up to 8-channel, slight performance degradation was observed when the number of channels reached 12. As the applied heat power increased, the average temperatures increase whereas thermal resistance (Rth) decreased. From channel-less design to 12-channel design, Rth values decreased from 6.8 °C/W to 5.31 °C/W.

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Section: Introductionmentioning

confidence: 99%

Numerical investigation of the effect of different heat sink fin structures on the thermal performance of automotive LED headlights

Şevik

Özdilli

AKBULUT

2022

International Journal of Automotive Science and Technology

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“…Many researchers have proposed effective solutions to address the cooling problem of automotive LED lamps, including forced-circulation air-cooled radiators [ 9 , 10 ], high-efficiency heat dissipation fins [ 5 ], radiators with special geometry and structure [ 11 ], heat pipe radiators [ 10 , 12 ], etc. All of these are proved to reduce T j and (or) the thermal resistance of the heat dissipation path of automotive LED lamps.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Heat Dissipation Performance of Automotive LED Lamps Using Graphene Coatings

2021

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Graphene heat-dissipating coating (GNHC) of 0.6 wt % GN concentration is utilized to promote the cooling performance of automotive light-emitting diode (LED) lamps. Three cases are studied as follows: Case 0 is the original automotive LED lamp as the baseline. Case 1 is to apply GNHC to reduce the thermal resistance of the junction surfaces between the components of automotive LED lamps. The aluminum fin radiator of Case 1 is further coated with GNHC on the surface that becomes Case 2. The spectrum, illuminance, power consumption, and surface temperature are measured at different ambient temperatures (Ta) to fully evaluate the feasibility of applying GNHC to improve cooling performance and the impacts on the related characteristics of automotive LED lamps. The results show that the maximum illuminance efficacy of Case 1 and Case 2 with high beam, irradiation angle of 0 degrees, and Ta of 80 °C is 11.03% and 8.70% higher than that of Case 0, respectively. The minimum temperature difference of heat dissipation path of Case 1 and Case 2 with high beam, irradiation angle of 90 degrees, and Ta of 80 °C is 6.41% and 5.33% lower than that of Case 0, respectively, indicating GNHC as a promising coating material for improving the cooling performance of automotive LED lamps.

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“…A vapor chamber is a superior cooling device that has ability more than a traditional heat sink. The vapor chamber is used in electronic cooling application such as hard disk drive cooling of PCs (Naphon et al, 2013), high-power LED (Chen et al, 2020;Wang., 2011;Tang et al, 2017), avionics applications (Reyes et al, 2012) cylindrical Li-ion battery pack (Liu et al, 2019;Gou and Liu., 2019), LED automotive headlamps (Lu et al, 2019), IGBT power module (Chen et al, 2019), a central processing unit of the PCs (Naphon et al, 2012), and mobile (Patankar et al, 2016). To obtain the minimum thermal resistance of the vapor chamber, it depends on the operating power, fill ratio, geometries, material types of heat sinks, configuration structures of the vapor chamber (Wiriyasart and Naphon, 2018a;Ming et al, 2009), heating areas, and heating modes (Tang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Transient thermal performance of constant fill ratio vapor chamber with different coolants

Wiriyasart

Naphon

2021

JTST

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In this study, a constant fill ratio vapor chamber using water and ferrofluid as the coolants on the thermal performance and thermal optimization to provide the cooling range are presented. The liquid flow rate of the condenser side ranges from 0.029−0.099 kg/s, the input power of 100−300 W, heat source size of 30 mm × 30 mm, and the water and ferrofluid with φ=0 %, φ=0.005 % and φ=0.05 % as coolants are investigated. The results indicate that the minimum thermal resistance of a traditional vapor chamber of 0.126 o C/W at m o = 0.075 kg/s and vapor chamber with a mini channel of 0.077 o C/W at m o = 0.049 kg/s at φ=0.005 % are obtained. The vapor chamber with and without mini channel at a certain fill ratio of 26 % and 33 %, the heat source size of 30 mm × 30 mm, and the mass flow rate of ≥ 0.042 kg/s are withstanding the heat load range from 100-200 W. However, to achieve the high heat load range from 100-300 W, the vapor chamber with mini channel using the Fe3O4 ferrofluid φ=0.005 % is covering the entire cooling range and is recommended in electronic cooling applications.

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Experimental investigation on the thermal performance of three-dimensional vapor chamber for LED automotive headlamps

Cited by 38 publications

References 31 publications

Numerical investigation of the effect of different heat sink fin structures on the thermal performance of automotive LED headlights

Numerical investigation of the effect of different heat sink fin structures on the thermal performance of automotive LED headlights

Enhanced Heat Dissipation Performance of Automotive LED Lamps Using Graphene Coatings

Transient thermal performance of constant fill ratio vapor chamber with different coolants

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