Experimental investigation on active heat sink with heat pipe assistance for high-power automotive LED headlights

Tang, Yifan; Luo, Yi; Du, Pengfei; Wang, Huawei; Ma, Haonan; Qin, Yuanfeng; Bai, Peng; Zhou, Guofu

doi:10.1016/j.csite.2021.101503

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…The development of vehicle headlights has gone through four stages: incandescent bulbs, halogen lamps, high-intensity discharge (HID) lamps, and light-emitting diodes (LEDs). LED headlights are gradually becoming a major trend in vehicle headlights due to their long life, energy efficiency, fast response time, light weight and small size, high brightness, and wide spectral range [ 36 , 37 ]. Sivak [ 38 ] found that LED headlights containing more blue light were more likely to produce discomfort glare than HID headlights; this is because the spectral sensitivity of discomfort glare depends not only on the photopic vision or the combination of the spectral sensitivity of photopic vision and scotopic vision of the eyes, but also on the short-wavelength type of cone cells (so-called “S” or “blue-sensitive” cones) [ 39 ].…”

Section: Methodsmentioning

confidence: 99%

Study on the Influence of Opposing Glare from Vehicle High-Beam Headlights Based on Drivers’ Visual Requirements

Guo

Wang

et al. 2022

IJERPH

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The anti-glare facilities in median strips are designed to block opposing headlights in order to avoid disability glare, but a large amount of headlight leakage results in uncomfortable glare, to the point that drivers can barely detect dangerous obstacles or road conditions. This paper aims to explore the glare range under high-beam headlights on drivers’ visual requirements. Based on an analysis of the mechanism of headlight glare, this paper proposes a subjective headlight glare scale, and classifies glare discomfort into two categories: interference glare, and acceptability glare. Combining the scales, 24 drivers and a standard light-emitting diode automotive headlamp were used to conduct glare effect tests. The size of the laboratory that closes to scotopic vision is 12 m × 6 m. The illuminance thresholds of disability glare–interference glare (DGIG) and interference glare–acceptability glare (IGAG), along with the spatial distribution of each glare level, were collected at the longitudinal distances of 3 m, 5 m, 7 m, 10 m, and 12 m. Meanwhile, the illuminance threshold and the spatial distribution of each glare level up to a longitudinal distance of 120 m were calculated. The results indicate that disability glare is distributed in the central area, while interference glare and acceptability glare are distributed from the center to the margins. At the same longitudinal distance, the vertical illuminance of the driver’s eye under the same glare level is almost equal. In the range of a longitudinal distance of 120 m, the spatial distribution of each glare level enlarges with each increase in longitudinal distance. The results can provide scientific evidence for calculating the reasonable heights of anti-glare facilities for expressways with different alignments.

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Section: Methodsmentioning

confidence: 99%

Study on the Influence of Opposing Glare from Vehicle High-Beam Headlights Based on Drivers’ Visual Requirements

Guo

Wang

et al. 2022

IJERPH

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“…The heat transfer effect is limited [ 21 ]. The advantages and disadvantages of heat pipes of different pipe materials and their application fields are shown in Table 1 [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 19 , 21 , 22 , 23 , 24 ]. Based on compatibility, the material with good thermal conductivity, long service life, good stability, low economic cost, good process performance, and easy processing is selected on a merit basis.…”

Section: Manufacturing Process For Ultra-thin Heat Pipesmentioning

confidence: 99%

“… Applications of UTHPs: ( a ) smart phone [ 11 ]; ( b ) laptop [ 12 ]; ( c ) smart watch [ 13 ]; ( d ) LED [ 14 ]; ( e ) solar thermoelectric generator [ 16 ]; ( f ) solar photovoltaic thermal system [ 17 ]. …”

Section: Figurementioning

confidence: 99%

“…As shown in Figure 2 [ 11 , 12 , 13 , 14 , 15 , 16 , 17 ], ultra-thin heat pipes have good application prospects because of their excellent heat dissipation performance and flexible structure in electronic mobile devices, high-power LEDs, and solar installations. In order to optimize the heat dissipation structure of mobile phones and to solve the problems of insufficient heat dissipation capacity, thick stacking, and large mass of traditional graphite or copper sheets, Zhou et al [ 11 ] designed an ultra-thin heat pipe, comparing it to copper sheets, and found that the ultra-thin heat pipe not only increases the maximum heat dissipation power by 28.57~42.86% but also reduces the weight of the heat dissipation structure by 64.51%.…”

Section: Introductionmentioning

confidence: 99%

“…The results showed that the thermal resistance of the ultra-thin heat pipe is 2.63 °C/W; the maximum heat flux is 0.9 W; the data is better than the copper block; it also has a faster heat dissipation speed [ 13 ]. Tang et al [ 14 ] constructed a heat sink platform based on heat pipes for high-power LED lamps, which was applied to automobiles, and the test data showed that the minimum thermal resistance is 1.86 °C/W and the maximum thermal resistance is less than 2.17 °C/W. Ji et al [ 15 ] tested the high-temperature heat pipe (HTHP) by simulating solar energy with a xenon lamp module.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Manufacturing Process and Heat Transfer Performance of Ultra-Thin Heat Pipes: A Review

Duan

et al. 2022

Materials

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This paper reviews the manufacturing process of ultra-thin heat pipes and the latest process technologies in detail, focusing on the progress of the shape, structure, and heat transfer mechanism of the wick. The effects of the filling rate and tilt angle on the heat transfer performance of the ultra-thin heat pipe, as well as the material selection of ultra-thin heat pipes, is sorted out, and the surface modification technology is analyzed. Besides, the optimal design based on heat pipes is discussed. Spiral woven mesh wick and multi-size composite wick have significant advantages in the field of ultra-thin heat pipe heat transfer, and comprehensive surface modification technology has huge potential. Finally, an outlook on future scientific research in the field of ultra-thin heat pipes is proposed.

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Investigation of a novel natural convection heat sink for LEDs based on U-shaped mini-heat pipe arrays

Jiu

Fan

Wang

2022

Applied Thermal Engineering

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Experimental investigation on active heat sink with heat pipe assistance for high-power automotive LED headlights

Cited by 16 publications

References 28 publications

Study on the Influence of Opposing Glare from Vehicle High-Beam Headlights Based on Drivers’ Visual Requirements

Study on the Influence of Opposing Glare from Vehicle High-Beam Headlights Based on Drivers’ Visual Requirements

Research on the Manufacturing Process and Heat Transfer Performance of Ultra-Thin Heat Pipes: A Review

Investigation of a novel natural convection heat sink for LEDs based on U-shaped mini-heat pipe arrays

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